Antibodies reactive with b7-h3, immunologically active fragments thereof and uses thereof.
Abstract
The present invention relates to antibodies and fragments thereof which are immunoreactive to the mammal, and more particularly, the human B7-H3 receptor and uses thereof, particularly in the treatment of cancer and inflammation. The invention thus particularly relates to antibodies reactive with B7-H3 and their immunoreactive fragments which are capable of mediating, and more preferably enhancing the activation of the immune system against cancer cells which are associated with a variety of human cancers.

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Expires 1 March 2031.
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7 claims: 5 independent, 2 dependent
- 1IMPI INSTITUTO MEXICANO DI LA non IDAD INDUSTRIAL REIVINDICACIONES _________________ 1. Una molécula que se enlaza a B7-H3, en donde la molécula es un anticuerpo aislado, un fragmento inmunoreactivo del mismo, o un diacuerpo, comprendiendo un dominio variable que 5 se une específicamente a un dominio extracelular de B7-H3, en donde la molécula:(A) Se une a B7-H3 que está expresada de manera endógena en la superficie de una célula cancerosa;y (B) Compite por la unión a B7-H3 con un anticuerpo que 10 comprende: (1) un dominio variable de cadena ligera que comprende CDRi (SEQ ID NO: 21), CDR 2 (SEQ ID NO: 23) y CDR 3 (SEQ ID NO: 25) y un dominio variable de cadena pesada que comprende CDRi (SEQ ID NO: 29), CDR 2 (SEQ ID NO: 31) y CDR 3 (SEQ ID NO: 33);15 (2) un dominio variable de cadena ligera que comprende CDRi (SEQ ID NO: 5), CDR 2 (SEQ ID NO: 7) y CDR 3 (SEQ ID NO: 9) y un dominio variable de cadena pesada que comprende CDRi (SEQ ID NO: 13), CDR 2 (SEQ ID NO: 15) y CDR 3 (SEQ ID NO: 17);o 20 (C) un dominio variable de cadena ligera que comprende CDRi (SEQ ID NO: 37) , CDR 2 (SEQ ID NO: 39) y CDR 3 (SEQ ID NO: 41) y un dominio variable de cadena pesada que comprende CDRi (SEQ ID NO: 45), CDR 2 (SEQ ID NO: 47) y CDR 3 (SEQ ID NO: 49). 2. La molécula que se enlaza a B7-H3 de conformidad con la 25 reivindicación 1, en donde la molécula que se une a la molécula B7-H3 se internaliza tras la unión a B7-H3 expresada sobre la superficie de una célula cancerosa. 152 IMPI INSTITUTO MEXICANO DE LA EXOHEDAD INDUSTRIAL de conformidad con 3. La molécula que se enlaza a B7-H3 cualquiera de las reivindicaciones 1-2, caracterizada porque es un anticuerpo monoclonal humanizado. 4. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 1-3, en donde la molécula comprende una región Fe de IgGl humana variante, en la que la región Fe de IgGl humana variante comprende al menos una modificación de aminoácido con respecto a la región Fe de la molécula nativa del anticuerpo, comprendiendo la(s) modificación/modificaciones de aminoácido una(s) modificación/modificaciones de aminoácido que altera(n) la afinidad o avidez de la región Fe variante para unirse a un FcyR de tal manera que la molécula muestra una función efectora potenciada con respecto a la región Fe nativa. 5. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 4, en donde la modificación de la región Fe comprende: (A) al menos una sustitución seleccionada del grupo que consiste en: (1) F243L;
- 2(2) D270E;
- 3(3) R292P;
- 4(4) S298N;
- 5(5) Y300L;
- 6(6) V305I;
- 7(7) A330V; y (8) P396L; 153 IMPI INSTITUTO MEXICANO OE LA FRONEDAD INDUSTRIAL (B) al menos una sustitución de dos residuos de aminoácido, seleccionándose las sustituciones del grupo que consiste en:(1) F243L y P396L;(2) F243L y R292P;y (3) R292P y V305I;(C) al menos una sustitución de tres residuos de aminoácido, seleccionándose las sustituciones del grupo que consiste en: (1) F243L, R292P y Y300L;(2) F243L, R292P y V305I;(3) F243L, R292P y P396L;y (4) R292P, V305I y P396L;(D) al menos una sustitución de cuatro residuos de aminoácido, seleccionándose las sustituciones del grupo que consiste en: (1) F243L, R292P, Y300L y P396L;y (2) F243L, R292P, V305I y P396L;o (E) una sustitución de al menos los cinco residuos de aminoácido: F243L, R292P, Y300L, V305I y P396;en donde la numeración es de acuerdo al esquema de numeración de Kabat. 6. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 4, en donde la modificación de la región Fe comprende sustituciones de: (A) F243L, R292P y Y300L;(B) L235V, F243L, R292P, Y300L y P396L;o (C) F243L, R292P, Y300L, V305I y P396L. en donde la numeración es de acuerdo al esquema de numeración de Kabat. 154 INSTITUTO MEXICANO •t LA MONEDAD industrial 7. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 6, en la que la molécula comprende: (A) un dominio variable de cadena ligera que comprende CDRi (SEQ ID NO: 5), CDR 2 (SEQ ID NO: 7) y CDR 3 (SEQ ID NO: 9) y un dominio variable de cadena pesada que comprende CDRi (SEQ ID NO: 13), CDR 2 (SEQ ID NO: 15) y CDR 3 (SEQ ID NO: 17);y (B) una modificación de la región Fe que comprende las sustituciones: L235V, F243L, R292P, Y300L y P396L;en donde la numeración es de acuerdo al esquema de numeración de Kabat. 8. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 7, en donde la molécula es un anticuerpo quimérico. 9. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 7, en donde la molécula es un anticuerpo humanizado. 10. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 1, caracterizada porque comprende: (A) un dominio variable de cadena ligera que tiene la secuencia de aminoácido de la SEQ ID NO: 89;(B) un dominio variable de cadena pesada que tiene la secuencia de aminoácido de la SEQ ID NO: 99;y (C) una región Fe que tiene las sustituciones: L235V, F243L, R292P, Y300L y P396L;en donde la numeración es de acuerdo al esquema de numeración de Kabat. 155 IMPI INSTITUTO MEXICANO M LA MONEDAD INBUSTUAL 11. Un hibridoma que secreta al anticuerpo aislado de la reivindicación 1. 12. Una molécula de ácido nucleico aislado que codifica a una cadena de polipéptido de la molécula que enlaza a B7-H3 de 5 conformidad con cualquiera de las reivindicaciones 1-10. 13. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 1, en donde la molécula es un diacuerpo que comprende: (A) una cadena polipeptídica I que comprende un dominio 10 de unión a epítope de VL de inmunoglobulina específico para unirse a B7-H3 y un dominio de unión a epítope de VH específico para unirse a una molécula distinta de B7-H3;y (B) una cadena polipeptídica II que comprende un dominio de unión a epítope de VH de inmunoglobulina 15 específico para unirse a B7-H3 y un dominio de unión a epítope de VL específico para unirse a la molécula distinta de B7-H3;en el que las cadenas polipeptídicas I y II están asociadas entre sí de modo que forman dominios de unión a 20 epítope funcionales que pueden unirse a B7-H3 y a la molécula distinta de B7-H3. 14. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 13, en donde el dominio de unión a epítope de 25 VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID NO:21), CDR 2 (SEQ ID NO: 23) y CDR 3 (SEQ ID NO:25) de la cadena ligera de BRCA69D y el dominio de unión a epítope de VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID 156 IMPI INSTITUTO MIRICA NO OI LA PROtIVDAD INDUSTRIAL NO: 29), CDR 2 (SEQ ID NO: 31) y CDR 3 (SEQ ID NO:33) de la cadena pesada de BRCA69D. 15. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 13, en donde el dominio de unión a epitope de VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID NO:5), CDR 2 (SEQ ID NO: 7) y CDR 3 (SEQ ID NO: 9) de la cadena ligera de BRCA84D y el dominio de unión a epitope de VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID NO: 13), CDR 2 (SEQ ID NO: 15) y CDR 3 (SEQ ID NO: 17) de la cadena pesada de BRCA84D. 16. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 13, en donde el dominio de unión a epitope de VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID NO:37), CDR 2 (SEQ ID NO: 39) y CDR 3 (SEQ ID NO:41) de la cadena ligera de PRCA157 y el dominio de unión a epitope de VL específico para unirse a B7-H3 comprende las secuencias de aminoácido de CDRi (SEQ ID NO: 45), CDR 2 (SEQ ID NO: 47) y CDR 3 (SEQ ID NO: 49) de la cadena pesada de PRCA157. 17. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 13, caracterizada porque comprende: (A) un dominio variable de cadena ligera que tiene la secuencia de aminoácido de la SEQ ID NO:89;y (B) un dominio variable de cadena pesada que tiene la secuencia de aminoácido de la SEQ ID NO:99. 157 INSTITUTO MM1CANO M LA PXOHKIAD INDUSTRIAL 18. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-17, en donde la molécula comprende por lo menos una porción de una región Fe. 19. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-18, en donde: (A) el polipéptido de cadena I adicionalmente comprende un dominio de enrollamiento de E y el polipéptido de cadena II adicionalmente comprende un dominio de enrollamiento de K;o (B) el polipéptido de cadena I adicionalmente comprende un dominio de enrollamiento de K y el polipéptido de cadena II adicionalmente comprende un dominio de enrollamiento de E. 20. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-19, en donde la molécula que es distinta a B7-H3 es un hapteno. 21. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 20, en donde el hapteno es isotiocianato de fluoresceina. 22. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-19, en donde la molécula que es distinta a B7-H3 es un receptor de célula T, un correceptor de célula T o el receptor NKG2D. 23. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-19, en donde la 158 IMPI INSTITUTO MEXICANO DE LA PROPIEDAD INDUSTRIAL molécula que es distinta a B7-H3 es un antigeno asociado a tumor. 24. La molécula que se enlaza a B7-H3 de conformidad con la reivindicación 23, en el que el antígeno asociado a tumor se 5 selecciona del grupo que consiste en A33;ADAM-9;ALCAM;BAGE;beta-catenina;CA125;carboxipeptidasa M;CD103;CD19;CD20;CD22;CD23;CD25;CD27;CD28;CD36;CD40/CD154;CD45;CD46;CD5;CD56;CD79a/CD79b;CDK4;CEA;CTLA4;citoqueratina 8;EGF-R;EphA2;ErbBl;ErbB3;ErbB4;GAGE-1;GAGE-2;10 GD2/GD3/GM2;qplOO;HER-2/neu;E6 de virus del papiloma humano;E7 de virus del papiloma humano;integrina alfa-Vbeta-β;JAM-3;KID3;KID31;KSA (17-1A);LUCA-2;MAGE-1;MAGE-3;MART;MUC-1;MUM-1;N-acetilglucosaminiltransferasa;oncostatina M;pl5;PIPA;PSA;PSMA;ROR1;sTn;receptor de 15 TNF-β;receptor de TNF-ot;receptor de TNF-γ;receptor de transferrina y receptor de VEGF. 25. Una molécula de ácido nucleico que codifica a una cadena de polipéptido de la molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 13-24. 20 26. Una composición farmacéutica que comprende (i) una cantidad terapéuticamente eficaz de la molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 1-10 o 13-24 y (ii) un portador farmacéuticamente aceptable. 27. La composición farmacéutica de conformidad con la 25 reivindicación 26, caracterizada porque además comprende uno o más agentes anticancerígenos. 159 28. La composición farmacéutica de conformidad con la reivindicación 27, en donde el agente anticancerígeno adicional es un agente quimioterapéutico, un agente radioterapéutico, un agente terapéutico hormonal, una toxina o un agente inmunoterapéutico. 29. La composición farmacéutica de conformidad con la reivindicación 28, en donde el agente anticancerígeno adicional es una toxina seleccionada del grupo que consiste en: un taxano, un maitansinoide, una auristatina, una caliqueamicina, una antraciclina, un análogo de CC-1065, docetaxel, una catepsina, ricina, gelonina, exotoxina de Pseudomonas, toxina diftérica, ARNasa y un radioisótopo tóxico. 30. La molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 1-10 o 13-24, para usarse en el diagnóstico de cáncer, en el que la molécula que se enlaza a B7-H3 está marcada de manera detectadle. 31. La molécula que se enlaza a B7-H3 para usarse de acuerdo con la reivindicación 30, en donde el cáncer se caracteriza por la presencia de una célula cancerosa seleccionada del grupo que consiste en una célula de un tumor de glándula suprarrenal, un cáncer asociado con el SIDA, un sarcoma de partes blandas alveolar, un tumor astrocítico, cáncer de vejiga, cáncer de hueso, un cáncer de cerebro y médula espinal, un tumor cerebral metastásico, un cáncer de mama, tumores de cuerpos carotídeos, un cáncer de cuello uterino, un condrosarcoma, un cordoma, un carcinoma de células renales cromófobo, un carcinoma de células claras, un cáncer de colon, un cáncer colorectal, un histiocitoma 160 IMPI fibroso benigno cutáneo, un tumor desmoplásico de células redondas pequeñas, un ependimoma, un tumor de Ewing, un condrosarcoma mixoide extraesquelético, una fibrogénesis imperfecta ósea, una displasia fibrosa del hueso, un cáncer de vesícula biliar o conducto biliar, cáncer gástrico, una enfermedad trofoblástica gestacional, un tumor de células germinales, un cáncer de cabeza y cuello, carcinoma hepatocelular, un tumor de células de islotes, un sarcoma de Kaposi, un cáncer de riñón, una leucemia, un lipoma/tumor lipomatoso benigno, un liposarcoma/tumor lipomatoso maligno, un cáncer de hígado, un linfoma, un cáncer de pulmón, un meduloblastoma, un melanoma, un meningioma, una neoplasia endocrina múltiple, un mieloma múltiple, un síndrome mielodisplásico, un neuroblastoma, tumores neuroendocrinos, un cáncer de ovario, un cáncer de páncreas, un carcinoma tiroideo papilar, un tumor paratiroideo, un cáncer pediátrico, un tumor de vaina de nervio periférico, un feocromocitoma, un tumor pituitario, un cáncer de próstata, un melanoma uveal posterior, un trastorno hematológico poco frecuente, un cáncer metastásico renal, un tumor rabdoide, un rabdomiosarcoma, un sarcoma, un cáncer de piel, un sarcoma de tejidos blandos, un cáncer de células escamosas, un cáncer de estómago, un sarcoma sinovial, un cáncer de testículos, un carcinoma tímico, un timoma, un cáncer metastásico tiroideo y un cáncer uterino. 32. El uso de la molécula que se enlaza a B7-H3 de conformidad con cualquiera de las reivindicaciones 1-10 o 1324 o de la composición farmacéutica de conformidad con 161 IMPI cualquiera de las reivindicaciones 26-29 en la preparación de un medicamento para el tratamiento de cáncer en un paciente. 33. El uso de la molécula que se enlaza a B7-H3 de conformidad con la reivindicación 32, en donde el cáncer se 5 caracteriza por la presencia de una célula cancerosa seleccionada del grupo que consiste en una célula de un tumor de glándula suprarrenal, un cáncer asociado con el SIDA, un sarcoma de partes blandas alveolar, un tumor astrocitico, cáncer de vejiga, cáncer de hueso, un cáncer de cerebro y 10 médula espinal, un tumor cerebral metastásico, un cáncer de mama, tumores de cuerpos carotideos, un cáncer de cuello uterino, un condrosarcoma, un cordoma, un carcinoma de células renales cromófobo, un carcinoma de células claras, un cáncer de colon, un cáncer colorectal, un histiocitoma 15 fibroso benigno cutáneo, un tumor desmoplásico de células redondas pequeñas, un ependimoma, un tumor de Ewing, un condrosarcoma mixoide extraesquelético, una fibrogénesis imperfecta ósea, una displasia fibrosa del hueso, un cáncer de vesícula biliar o conducto biliar, cáncer gástrico, una 20 enfermedad trofoblástica gestacional, un tumor de células germinales, un cáncer de cabeza y cuello, carcinoma hepatocelular, un tumor de células de islotes, un sarcoma de Kaposi, un cáncer de riñón, una leucemia, un lipoma/tumor lipomatoso benigno, un liposarcoma/tumor lipomatoso maligno, 25 un cáncer de hígado, un linfoma, un cáncer de pulmón, un meduloblastoma, un melanoma, un meningioma, una neoplasia endocrina múltiple, un mieloma múltiple, un síndrome mielodisplásico, un neuroblastoma, tumores neuroendocrinos, un cáncer de ovario, un cáncer de páncreas, un carcinoma 162 ssTrruTo mmicano tiroideo papilar, un tumor paratiroideo, un cáncer pediátrico, un tumor de vaina de nervio periférico, un feocromocitoma, un tumor pituitario, un cáncer de próstata, un melanoma uveal posterior, un trastorno hematológico poco frecuente, un cáncer metastásico renal, un tumor rabdoide, un rabdomiosarcoma, un sarcoma, un cáncer de piel, un sarcoma de tejidos blandos, un cáncer de células escamosas, un cáncer de estómago, un sarcoma sinovial, un cáncer de testículos, un carcinoma tímico, un timoma, un cáncer metastásico tiroideo y un cáncer uterino. 34. El uso de la molécula que se enlaza a B7-H3 de conformidad con la reivindicación 33, en donde el uso comprende además la administración de una o más terapias para el cáncer adicionales seleccionadas del grupo que consiste en quimioterapia, inmunoterapia, terapia por radiación, terapia hormonal y cirugía. 163 RESUMEN IMPI ΠΜΤΓΠνΤΟ ΜβΧΚΛΝΟ M LA RROHIDAD INDUSTRIAL La presente invención se refiere a anticuerpos y su7 fragmentos que son inmunoreactivos frente al receptor de B7H3 de mamífero, y más particularmente, humana y a usos de los 5 mismos, particularmente en el tratamiento del cáncer y la inflamación. La invención se refiere por tanto particularmente a anticuerpos reactivos frente a B7-H3 humanizados y a sus fragmentos inmunoreactivos que pueden mediar, y más preferiblemente potenciar, la activación del 10 sistema inmunitario frente a células cancerosas que están asociadas con una variedad de cánceres humanos. 164
Independent claims7
1,660 paragraphs in 220 sections, as filed
cancers.
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Mexican Institute of Industrial Property
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PATENT TITLE NO. 345232
Owner (s): MACROGENICS, INC.
Address: 1500 E. Gude Dríve, Rockville, Maryland, 20850, USA
Name: ANTIBODIES REACTIVE WITH B7-H3, IMMUNOLOGICALLY ACTIVE FRAGMENTS OF THE SAME AND THEIR USES.
Classification: lntCI.8: A61K39 / 00; A61K39 / 395; A61K45 / 06; C07K16 / 28; C07K16 / 3O;
C07K16 / 44; G01N33 / 68
Inventor (s): DERYK T. LOO; LING HUANG
<td colspan="3">REQUEST</td>
<td>Number:</td><td>Filing date inte</td><td>"national:</td>
<td>MX / a / 2012/010201</td><td>March 01, 2011</td><td></td>
<td></td><td>PRIORITY</td><td></td>
<td>Country:</td><td>Date:</td><td>Number:</td>
<td>US</td><td>March 4, 2010</td><td> 61/310,692</td>
<td>US</td><td>March 4, 2010 ......</td><td> 61/310,695</td>
<td>US</td><td>March 5, 2010</td><td> 61/311,057</td>
Validity: Twenty years
Expiration Date: March 1, 2031?
,; The reference patent is granted based on articles 1<sup>or</sup>, 2<sup>or</sup> fraction V, 6th fraction III, and the Industrial Property charter.
In accordance with article 2J of the Industrial Property Law, this patent has a non-extendable term of twenty years, counted from the date of filing of the international application and will be subject to fl »fe to keep the rights in force. ''
Whoever signs the present title does so based on the provisions of articles 9® phtacetones III and 7 bis 2¿e of the Industrial Property Law (aBrio Oficial de la Federación (DOF) 27, j £ .'99! ui .- ”naaa on 08/02/1894 10/25/1996, 12/26/1997, 05/17/1999, 01/22/2004, 06/16/200 ^ 01/25/2006, 05/06 / 2009,06 / 01/20 ^ 18/08/2010, 28/09 ^ 010, 27/01/2012 and 09/04/2012); Articles 1 ° 3 fraction V subsection a), 4 ° and 12 ° sections I and III of the Regulations of the Mexican Institute flfl Industrial Property (DOF 12/14/1990, amended on 07/01/2002,15/07/2004 07/28/2004 and 09/07/2007); Articles 1, 3, 4, 5 Faction V subsection a), 16 sections I and III and 30 of the Organic Statute of the Mexican Property Institute (DOF 12/27/1999, amended on 107.1 (22002, 07/29/2004, 06/04/2004 and 13 »9/2007); 1st, 3rd, and 5th subsection a) of the Agreement that delegates powers to the Deputy General Directors, Coordinator, Divisional Directors, Heads of Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property. (DOF 12/15/1999, amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007).
Issue Date: January 20, 2017
THE DIVISIONAL DIRECTOR OF PATENTS
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NAHANNY CANAL REYES
Sand! No. 550. Floor 1.
Coi. Puebío Santa María Tepepan, Xochimilco. CP 16020.
Mexico City
Tea!. (55) 53 34 07 00 www.impi qob mx
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ANTIBODIES REACTIVE WITH B7-H3, IMMUNOLOGICALLY ACTIVE FRAGMENTS OF THE SAME AND THEIR USES jy
Cross reference to related requests:
'NtXNTR¡A £
This application claims priority of US patent applications with n.<sup>you</sup> Serial 61 / 310,692 (filed March 4, 2010; pending); 61 / 310,695 (filed March 4, 2010; pending); 61 / 311,057 (filed March 5, 2010; pending), each of which is incorporated herein by reference in its entirety.
Reference to sequence lists:
This application includes one or more sequence listings under 37 CFR 1.821 et seq., Which are disclosed on both paper and computer-readable media, and descriptions on paper and computer-readable media which are incorporated herein by reference in its entirety.
Background of the invention:
Field of the invention:
The present invention relates to antibodies and their fragments that are immunoreactive against the mammalian, and more particularly, human B7-H3 receptor and to uses thereof, particularly in the treatment of cancer and inflammation. The invention therefore particularly relates to humanized B7-H3-reactive antibodies and their immunoreactive fragments that can mediate, and more preferably enhance, the activation of the immune system against cancer cells that are associated with a variety of human cancers.
Description of Related Art:
Tumor growth and metastasis is highly dependent on their ability to escape host immune surveillance and overcome host defenses. Most tumors express antigens that can be recognized to a variable degree by the host immune system, but in many cases an inadequate immune response is elicited due to ineffective activation of effector T cells (Khawli, LA et al. (2008) “Cytokine, Chemokine, and Co-Stimulatory Fusion Proteins for the Immunotherapy of Solid Tumors, Exper. Pharmacol. 181: 291-328).
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CD4 + T lymphocytes are essential organizers of most mammalian immune and autoimmune responses (Dong, C. et al. (2003) "Immune Regulation by Novel Costimulatory Molecules", Immunolog. Res. 28 (1): 39-48 ). Activation of CD4 + helper T cells has been found to be mediated through costimulatory interactions between antigen-presenting cells and naive CD4 + T lymphocytes. Two interactions are required (Viglietta, V. et al. (2WT) "Modulating Co-Stimulation \ Neurotherapeutics 4: 666675; Korman, AJ et al. (2007) "Checkpoint Blockade in Cancer Immunotherapy", Adv. Immunol. 90: 297-339). In the first interaction, an antigen-presenting cell must present the relevant target antigen bound to the cell's major histocompatibility complex so that it can bind to the T-cell receptor ("TCR") of a naive CD4 + T lymphocyte. In the second interaction, an antigen-presenting cell ligand must bind to a CD28 receptor on the CD4 + T lymphocyte (Dong, C. et al. (2003) "Immune Regulation by Novel Costimulatory Molecules", Immunolog. Res. 28 (l ): 39-48; Lindley, PS et al. (2009) "The Clinical Utility Of Inhibiting CD28-Mediated Costimulation", Immunol. Rev. 229: 307-321). CD4 + helper T cells that experience both stimulatory signals can then respond to cytokines (such as interleukin 2 and interleukin 12) to develop into Thl cells. Such cells produce interferon gamma (IFN-γ) and tumor necrosis factor alpha (TNF-α), which mediate inflammatory responses against target cells that express the target antigen. Activation and proliferation of B cells also occurs, resulting in the production of antibodies specific for the target antigen (Bemard, A. et al. (2005) "T and B Cell Cooperation: A Dance of Life and Death", Transplantation 79: S8-S11). In the absence of both costimulatory signals during TCR docking, T cells enter a functionally non-receptive state, termed clonal anergy (Khawli, LA et al. (2008) "Cytokine, Chemokine, and Co-Stimulatory Fusion Proteins for the Immunotherapy of Solid Tumors", Exper. Pharmacol. 181: 291-328). In disease states, Thl cells are the key elements of various organ-specific autoimmune diseases, such as type I diabetes, rheumatoid arthritis and multiple sclerosis (Dong, C. et al. (2003) "Immune Regulation by Novel Costimulatory Molecules", Immunolog. Res. 28 (1): 39-48).
I. The B7 and B7-H3 superfamily
Investigations of the CD28 receptor ligands have led to the characterization of a set of related molecules known as the B7 superfamily (Coyle, AJ et al. (2001) "The Expanding B7 Superfamily: Increasing Complexity In Costimulatory Signs
IMPI INSTITUTO MEXICANO DE LA MO * I *> AD ^ “Ίί-ΤΊ. .. ·· INDUSTRIAL
Regulating T Cell Function, Nature Immunol. 2 (3): 203-209; Sharpe, AH et al. (2002) “The B7CD28 Superfamily, Nature Rev. Immunol. 2: 116-126; Greenwald, RJ et al. (2005) “The B7 Family Revisited, Ann. Rev. Immunol. 23: 515-548; Collins, M. et al. (2005) "The B7 Family Of Immune-Regulatory Ligands, Genome Biol. 6: 223.1-223.7; Loke, P. et al. (2004) “Emerging Mechanisms Of Immune Regulation: The Extended B7 Family And Regulatory T Cells. Arthritis Res. Ther. 6: 208-214; Korman, AJ et al. (2007) “Checkpoint Blockade in Cancer Immunotherapy, Adv. Immunol. 90: 297-339; Flies, DB et al. (2007) “The New B7s: Playing a Pivotal Role in Tumor Immunity, J. Immunother. 30 (3): 251-260; Agarwal, A. et al. (2008) “The Role Of Positive Costimulatory Molecules In Transplantation And Tolerance, Curr. Opin. Organ Transplant. 13: 366-372; Lenschow, DJ et al. (1996) "CD28 / B7 System of T Cell Costimulation, Ann. Rev. Immunol. 14: 233-258; Wang, S. et al. (2004) “Co-Signaling Molecules Of The B7CD28 Family In Positive And Negative Regulation OfT Lymphocyte Responsos, Microbes Infect. 6: 759-766). There are currently seven known members of the family: B7.1 (CD80), B7.2 (CD86), the inducible costimulatory ligand (ICOS-L), the programmed cell death ligand 1 (PD-L1), the death ligand programmed cell 2 (PD-L2), B7-H3 and B7-H4 (Collins, M. et al. (2005) “The B7 Family Of Immune-Regulatory Ligands, Genome Biol. 6: 223.1-223.7).
Members of the B7 family are members of the immunoglobulin superfamily with an immunoglobulin type V domain and an immunoglobulin type C domain (eg, IgV-IgC) (Sharpe, AH et al. (2002) "The B7-CD28 Superfamily, Nature Rev. Immunol. 2: 116-126). The IgV and IgC domains of the B7 family members are each encoded by individual exons, with additional exons encoding for leader sequences, transmembrane and cytoplasmic domains. Cytoplasmic domains are short, ranging in length from 19 to 62 amino acid residues, and can be encoded by multiple exons (Collins, M. et al. (2005) "The B7 Family Of Immune-Regulatory Ligands, Genome Biol. 6: 223.1- 223.7). B7-H3 is unique in that the major human form contains two extracellular tandem IgV-IgC domains (ie, IgV-IgC-IgV-IgC) (Collins, M. et al. (2005) "The B7 Family Of Immune-Regulatory Ligands, Genome Biol. 6: 223.1-223.7). Members of the B7 family are predicted to form non-covalent homodimers, one after another, on the cell surface, and such dimers have been found with respect to B7-1 (CD80) and B7-2 (CD86).
B7-1 (CD80) and B7-2 (CD86) are shown to have double specificity for the stimulating CD28 receptor and the inhibitory CTLA-4 receptor (CD152) (Sharpe, AH et al. (2002) “The B7-CD28 Superfamily, Nature Rev. Immunol. 2: 116-126).
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Although it was initially thought to comprise only 2 Ig domains (IgV-IgC) (Chapoval, A. et al. (2001) "B7-H3: A Costimulatory Molecule For T Cell Activation and IFN-γ Production", Nature Immunol. 2 : 269-274; Sun, M. et al. (2002) "Characterization of Mouse and Human B7-H3 Genes", J. Immunol. 168: 6294-6297), a variant of four extracellular domains of immunoglobulin has been identified ( "4Ig-B7-H3") and has been found to be the most common human form of the protein (Sharpe, AH et al. (2002) "The B7-CD28 Superfamily", Nature Rev. Immunol. 2: 116-126). No functional difference has been observed between the two forms, as the natural murine form (2Ig) and the human 4Ig form show a similar function (Hofmeyer, K. et al. (2008) "The Contrasting Role Of B7-H3" , Proc. Nati. Acad. Sci. (USA) 105 (30): 10277-10278). The 4Ig-B7-H3 molecule inhibits natural killer lymphocyte-mediated lysis of cancer cells (Castriconi, R. et al. "Identification Of 4Ig-B7-H3 As A Neuroblastoma-Associated Molecule That Exerts A Protective Role From An NK Cell-Mediated Lysis", Proc. Nati. Acad. Sci. (USA) 101 (34): 12640-12645). Human B7-H3 (2Ig form) has been found to promote T cell activation and IFN-γ production by binding to a putative receptor on activated T cells (Chapoval, A. et al. (2001) “B7-H3: A Costimulatory Molecule For T Cell Activation and IFN-γ Production ", Nature Immunol. 2: 269-274; Xu, H. et al. (2009) "MicroRNA miR-29 Modulates Expression of Immunoinhibitory Molecule B7-H3: Potential Implications for Immune Based Therapy of Human Solid Tumors", Cancer Res. 69 (15): 52756281). Both B7-H4 and B7-H1 are potent inhibitors of immune function when expressed on tumor cells (Flies, DB et al. (2007) "The New B7s: Playing a Pivotal Role in Tumor Immunity", J. Immunother. 30 (3): 251-260).
The mode of action of B7-H3 is complex, since the protein mediates both costimulation and co-inhibition of T cells (Hofmeyer, K. et al. (2008) "The Contrasting Role OfB7-H3", Proc. Nati. Acad Sci. (USA) 105 (30): 10277-10278; Martin-Orozco, N. et al. (2007) "Inhibitory Costimulation And Anti-Tumor Immunity", Semin. Cancer Biol. 17 (4): 288-298 ; Subudhi, SK et al. (2005) "The Balance Of Immune Responses: Costimulation Verse Coinhibition", J. Mol. Med. 83: 193-202). B7-H3 binds to transcript type (TREM) 2 (TLT-2) and costimulates T-cell activation, but also binds to yet-unidentified receptor (s) to mediate T-cell co-inhibition. , B7-H3, through interactions with unknown receptors), is an inhibitor of natural killer lymphocytes and osteoblast cells (Hofmeyer, K. et al. (2008) "The Contrasting Role Of B7-H3", Proc. Nati. Acad. Sci. (USA) 105 (30): 10277-10278). Inhibition may work through interactions with members of the
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IMPI
INSTITUTO MEXICANO de la non age INDUSTRIAL major signaling pathways through which the T-cell receptor (TCR) regulates gene transcription (for example, NFTA, NF-κΒ or AP-1 factors).
B7-H3 costimulates the proliferation of CD4 + and CD8 + T cells. B7-H3 also stimulates IFN-γ production and CD8 + lyrical activity (Chapoval, A. et al. (2001) “B7-H3. · A Costimulatory Molecule For T Cell Activation and IFN-γ Production”, Nature Immunol. 2: 269274; Sharpe, AH et al. (2002) "The B7-CD28 Superfamily", Nature Rev. Immunol. 2: 116-126). However, the protein also possibly acts through the factors NFAT (nuclear factor for activated T cells), NF-κΒ (nuclear factor kappa B) and AP-1 (activating protein 1) to inhibit T cell activation (Yi KH et al. (2009) "Fine Tuning The Immune Response Through B7-H3 And B7-H4, Immunol. Rev. 229: 145-151). B7-H3 is also believed to inhibit Thl, Th2 or Thl7 in vivo (Prasad, DV et al. (2004) "Murine B7-H3 Is A Negative RegulatorOfT Cells<sup>,</sup>\ J. Immunol. 173: 2500-2506; Fukushima, A. et al. (2007) "B7-H3 Regulates The Development Of Experimental Allergic Conjunctivitis In Mice", Immunol. Lett. 113: 52-57; Yi. KH et al. (2009) "Fine Tuning The Immune Response Through B7-H3 And B7-H4", Immunol. Rev. 229: 145-151). Several independent studies have shown that human malignant tumor cells show markedly increased B7-H3 protein expression and that this increased expression was associated with increased disease severity (Zang, X. et al. (2007) "The B7 Family And Cancer Therapy: Costimulation And Coinhibition", Clin. Cancer Res. 13: 5271-5279), which suggests that tumors take advantage of B7-H3 as an immune evasion route (Hofineyer, K. et al. . (2008) "The Contrasting Role Of B7-H3", Proc. Nati. Acad. Sci. (USA) 105 (30): 10277-10278).
Molecules that block the ability of a B7 molecule to bind to a T cell receptor (eg, CD28) suppress the immune system and have been proposed as treatments for autoimmune disease (Linsley, PS et al. (2009) "The Clinical Utility Of Inhibiting CD28-Mediated Co-Stimulation ", Immunolog. Rev. 229: 307-321). Neuroblastoma cells expressing 4Ig-B7-H3 treated with anti-4Ig-B7-H3 antibodies were more susceptible to NK cells. However, it is not clear whether this activity can be attributed only to antibodies against the 4Ig-B7-H3 form because all the reported antibodies raised against 4Ig-B7-H3 also bound to the two-Ig type form of B7H3 ( Steinberger, P. et al. (2004) "Molecular Characterization of Human 4Ig-B7-H3, a Member of the B7 Family with Four Ig-Like Domains", J. Immunol. 172 (4): 2352-2359 and Castriconi et al. (2004) “Identification Of 4Ig-B7-H3
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As A Neuroblastoma-Associated Molecule That Exerts A Protective Role From An NK CellMediated Lysis ”, Proc. Nati. Acad. Sci. (USA) 101 (34): 12640-12645).
B7-H3 is not expressed in resting B or T cells, monocytes or dendritic cells, but is induced in dendritic cells by IFN-γ and in monocytes by GM-CSF (Sharpe, AH et al. (2002) “The B7- CD28 Superfamily ", Nature Rev. Immunol. 2: 116-126). The receptor (s) that bind to B7-H3 has not been fully characterized. Initial work suggested that such a receptor would need to be rapidly and transiently upregulated in T cells after activation (Loke, P. et al. (2004) “Emerging Mechanisms Of Immune Regulation: The Extended B7 Family And Regulatory T Cells ". Arthritis Res. Ther. 6: 208214). Recently, it has been shown that the transcript receptor type (TREM) 2 (TLT-2, or TREML2) (King, RG et al. (2006) "Trem-Like Transcript 2 Is Expressed On Cells Of The Myeloid / Granuloid And B Lymphoid Lineage And Is Up-Regulated In Response To Inflamation", J. Immunol. 176: 6012-6021; Klesney-Tait, J. et al. (2006) "The TREM Receptor Family And Signal Integratiori", Nat. Immunol. 7: 1266-1273; Yi. KH et al. (2009) “Fine Tuning The Immune Response Through B7-H3 And B7-H4, Immunol. Rev. 229: 145-151), which is expressed in myeloid cells, can bind to B7-H3, and therefore costimulate the activation of CD8 + T cells in particular (Zang, X. et al. (2003) “B7x: A Widely Expressed B7 Family Member That Inhibits T Cell Activation ", Proc. Nati. Acad. Sci. (USA) 100: 10388-10392; Hashiguchi, M. et al. (2008)" Triggering Receptor Expressed On Myeloid Cell-Like Transcript 2 (TLT -2) Is A CounterReceptor For B7-H3 And Enhances T Cell Responses ”, Proc. Nati. Acad. Sci. (USA) 105 (30): 10495-10500; Hofmeyer, K. et al. (2008) "The Contrasting Role OfB7-H3", Proc. Nati. Acad. Sci. (USA) 105 (30): 10277-10278).
In addition to its expression in neuroblastoma cells, human B7-H3 is also known to be expressed in a variety of other cancer cells (eg, non-small cell gastric, ovarian, and lung cancers). B7-H3 protein expression has been immunohistologically detected in tumor cell lines (Chapoval, A. et al. (2001) "B7-H3: A Costimulatory Molecule For T Cell Activation and IFN-γ Production", Nature Immunol. 2: 269274; Saatian, B. et al. (2004) "Expression Of Genes For B7-H3 And Other T Cell Ligands By Nasal Epithelial Cells During Difference And Activation", Amer. J. Physiol. Lung Cell. Mol. Physiol. 287: L217-L225; Castriconi et al. (2004) "Identification Of 4Ig-B7-H3 As A Neuroblastoma-Associated Molecule That Exerts A Protective Role From An NK Cell-Mediated Lysis", Proc. Nati. Acad. Sci. (USA) 101 (34): 12640-12645); Sun, M. et al. (2002) 6
IMPI institut · Mexican κ la nom * Ai> INDUSTRIAL “Characterization of Mouse and Human B7-H3 Genes, J. Immunol. 168: 6294-6297). The expression of mRNA has been found in cells of the heart, kidney, testis, lung, liver, pancreas, prostate, colon and osteoblasts (Collins, M. et al. (2005) "The B7 Family Of ImmuneRegulatory Ligands, Genome Biol. 6 : 223.1-223.7). At the protein level, B7-H3 is found in the liver, lung, bladder, testes, prostate, breast, placenta and human lymphoid organs (Hofineyer, K. et al. (2008) "The Contrasting Role Of B7-H3, Proc Nati. Acad. Sci. (USA) 105 (30): 10277-10278).
II. Therapeutic antibodies
In addition to their known uses in diagnosis, antibodies have been shown to be useful as therapeutic agents. For example, in recent years immunotherapy, or the use of antibodies for therapeutic purposes, has been used to treat cancer. Passive immunotherapy involves the use of monoclonal antibodies in cancer treatments (see for example, DeVita, Hellman, and Rosenberg's Cancer: Principles & Practice of Oncology, Eighth Edition (2008), DeVita, V. et al. Eds., Lippincott Williams & Wilkins, Philadelphia, PA, pp. 537-547, 2979-2990). These antibodies may have inherent therapeutic biological activity both through direct inhibition of tumor cell growth or survival and through their ability to recruit the natural cell killing activity of the body's immune system. These agents can be administered alone or in conjunction with radiation or chemotherapeutic agents. Rituximab and trastuzumab, approved for the treatment of non-Hodgkin lymphoma and breast cancer, respectively, are examples of such therapeutic agents. Alternatively, antibodies can be used to prepare antibody conjugates in which the antibody is bound to a toxic agent and targets that agent to the tumor by specific binding to the tumor. Gemtuzumab ozogamicin is an example of an approved antibody conjugate used for the treatment of leukemia.
Monoclonal antibodies that bind to cancer cells have been disclosed and have potential uses for diagnosis and therapy (see, for example, the following patent applications that disclose, among others, some molecular weights of target proteins: US Patent No. 6,054,561 (200 kD c-erbB-2 (Her2), and other unknown antigens 40,200 KD in size) and US Patent No.<sup>0</sup> 5,656,444 (50 kD and 55 kD oncofetal protein)). Examples of antibodies in clinical trials and / or approved for the treatment of solid tumors include: trastuzumab (antigen: 180 kD, HER2 / neu), edrecolomab (antigen: 407
IMPI ^ π <πτυτο Mexican industrial ntomoAD kD, Ep-CAM), human milk fat anti-globule antibody (HMFG1) (antigen> 200 kD, HMW mucin), cetuximab (antigens: 150 kD and 170 kD , EGF receptor), alemtuzumab (antigen: 21-28 kD, CD52) and rituximab (antigen: 35 kD, CD20).
The antigen targets of trastuzumab (Her-2 receptor), which is used to treat breast cancer, and cetuximab (EGF receptor), which is used in clinical trials to treat various cancers, are present at some detectable in a large number of normal human adult tissues including skin, colon, lung, ovaries, liver, and pancreas. The margin of safety in using these therapeutic agents is possibly provided by the difference in antigen expression levels or in the access or activity of the antibody at those sites.
Another type of immunotherapy is an active immunotherapy, or vaccination, with an antigen present in specific cancer (s) or a DNA construct that directs the expression of the antigen, which then elicits the immune response in the individual, that is, to induce the individual to actively produce antibodies against their own cancer. Active immunization has not been used as often as passive immunotherapy or immunotoxins.
Various models of disease progression (including cancer) have been suggested. Theories range from a causality due to a single infectious / transformative event to the evolution of an increasingly “disease-type” or “cancerous-type” tissue type that ultimately leads to one with a completely pathogenic or malignant capacity. Some people argue that with cancer, for example, a single mutation event is sufficient to cause a malignant tumor, while others argue that subsequent alterations are also needed. Some others have suggested that increasing tumor grade and mutational burden are required for both initiation and progression of neoplasia through a continuum of mutation-selection events at the cellular level. Some cancer targets are only found in tumor tissues, while others are present in normal tissues and are upregulated and / or overextended in tumor tissues. In such situations, some investigators have suggested that overexpression is associated with the acquisition of malignancy, while others suggest that overexpression is simply a marker of a trend along a trajectory toward an increasing disease state.
In some cases, cancer targets, such as oncoproteins expressed or overexpressed in tumors, have been shown to be present during embryonic and fetal development and serve as a regulator of growth and differentiation. Some researchers have 8
IMPI «Νϊτπντο mmcjcano DtLAMtomtMD INDUSTRIAL found that the expression of these oncoproteins during embryonic and fetal development appears to be limited to specific tissues and also limited to specific stages of development. Instead, adult expression of these oncoproteins has been shown to be associated with overexpression in tumor growth and / or a malfunction of tumor suppressor proteins.
An ideal diagnostic and / or therapeutic antibody would be specific for an antigen present in a large number of cancers, but absent or present only at low levels in any normal tissue. The discovery, characterization and isolation of a novel antibody that can bind to an antigen that is specifically associated with cancers) would be useful in many ways. First, the antibody would have biological activity against such cancer cells and could recruit the response of the immune system to treat the disease. The antibody could be administered as a therapeutic agent alone or in combination with current treatments or used to prepare immunoconjugates bound to toxic agents. An antibody with the same specificity but with low or no biological activity when administered alone could also be useful because an antibody could be used to prepare an immunoconjugate with a radioisotope, a toxin, or a chemotherapeutic agent or liposome containing a chemotherapeutic agent, being the biologically active conjugated form thanks to the antibody that directs the toxin to the cells that contain antigen.
As discussed above, antibodies and other molecules that specifically bind to B7-H3 have been described (see US Patent Nos. 7,527,969; 7,368,554; 7,358,354 and 7,279,567; US Patent No.<sup>08</sup> US 20090087416; US 20090022747; US 20090018315; US2008116219; US20080081346; US 20050202536; US20030103963; US20020168762; PCT publications n.<sup>you</sup> WO 2008/116219; WO 2006/016276; WO 2004/093894; WO 04/001381; WO 2002/32375; WO 2002/10187 and WO 2001/094413; EP 1292619B; Modak, S. et al. (March 1999) "Disialoganglioside GD2 And Antigen 8H9: Potential Targets For Antibody-Based Immunotherapy Against Desmoplastic Small Round Cell Tumor (DSRCT) And Rhabdomyosarcoma (RMS)", Proceedings Of The American Association For Cancer Research Annual Meeting, vol. 40: 474 (90<sup>th</sup> Annual Meeting Of The American Association For Cancer Research; Philadelphia, Pennsylvania, USA; ΙΟΙ April 4, 1999; Modak, S. et al. (March 2000) "Radioimmunotargeting To Human Rhabdomyosarcoma Using Monoclonal Antibody 8H9", Proc. Am. Assoc. Cancer Res.41: 724; Modak, S. et al. (2001) "Monoclonal antibody 8H9 Targets A Novel Cell Surface Antigen 9
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ΙΝΓΠΤυΤΟ MtXICANC · »LA PKOH1DAD industrial \ ¿***« and Expressed By A Wide Spectrum Of Human Solid Tumors ”, Cancer Res. 61 (10): 4048-4054; Steinberger, P. et al. (2004) "Molecular Characterization of Human 4Ig-B7-H3, a Member of the B7 Family with Four Ig-Like Domains", J. Immimol. 172 (4): 2352-2359; Xu, H. et al. (2009) “MicroRNA miR-29 Modulates Expression of Immunoinhibitory Molecule B7-H3: Potential Implications for Immun and Based Therapy of Human Solid Tumors, Cancer Res. 69 (15): 52756281).
However, a desirable aspect for an ideal diagnostic and / or therapeutic antibody would be the discovery and characterization of novel antibodies that can mediate, and particularly enhance the activation of the immune system against cancer cells (especially human cancer cells) that are associated with a variety of cancers. Such compositions would also be useful for drug discovery (eg, small molecules) and for further characterization of cell regulation, growth, and differentiation.
Thus, despite all previous advancements, there remains a need for improved compositions that can bind to cancer cells and facilitate or mediate an immune response against cancer cells. Such compositions can be used to diagnose and treat such cancers. There is a further need, based on the discoveries disclosed herein, for novel compositions that specifically recognize dual targets on the surface of cells, and that can thereby modulate, either by reducing or enhancing, the capabilities of B7 -H3 to mediate T-cell activation or by recognizing and killing cancer cells that express B7-H3. An object of this invention is to identify such compositions. Another object is to provide novel compounds for use in the assay of B7-H3 expression.
As described in detail below, the present invention relates to novel antibodies, including in particular double affinity redirection reagents ("DART ™") comprising modulators of T cell activation by B7-H3, which can influence on the activation of T cells as well as novel antibodies that bind to B7-H3 receptors of cancer cells and facilitate or mediate the death of such cells. The present invention relates to such compositions and their uses in the diagnosis and treatment of diseases such as cancer.
Summary of the invention:
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MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY
The present invention relates to antibodies and their fragments that are immunoreactive against the mammalian, and more particularly, human B7-H3 receptor, and to uses thereof, particularly in the treatment of cancer and inflammation. The invention therefore particularly relates to humanized B7-H3 reactive antibodies and their immunoreactive fragments that can mediate, and more preferably enhance, the activation of the immune system against cancer cells that are associated with a variety of human cancers.
In detail, the invention relates to an isolated antibody or an immunoreactive fragment thereof, the isolated antibody or fragment comprising a variable domain that specifically binds to an extracellular domain of B7-H3, the antibody competing for binding to B7- H3 with any of the antibodies: BRCA69D, BRCA84D or
PRCA157.
The invention further relates to the isolated antibody or immunoreactive fragment thereof described above, the antibody or fragment comprising a variable domain comprising:
(A) CDRi (SEQ ID NO: 21), CDR<sub>2</sub> (SEQ ID NO: 23) and CDR<sub>3</sub> (SEQ ID NO: 25) of the light chain of BRCA69D and CDRi (SEQ ID NO: 29), CDR<sub>2</sub> (SEQ ID NO: 31) and CDR<sub>3</sub> (SEQ ID NO: 33) from BRCA69D heavy chain;
(B) CDRi (SEQ ID NO: 5), CDR<sub>2</sub> (SEQ ID NO: 7) and CDR<sub>3</sub> (SEQ ID NO: 9) of the light chain of BRCA84D and CDRi (SEQ ID NO: 13), CDR<sub>2</sub> (SEQ ID NO: 15) and CDR<sub>3</sub> (SEQ *) NO: 17) of the heavy chain of BRCA84D; or (C) CDRi (SEQ ID NO: 37), CDR<sub>2</sub> (SEQ ID NO: 39) and CDR<sub>3</sub> (SEQ ID NO: 41) of the light chain of PRCA157 and CDRi (SEQ ID NO: 45), CDR<sub>2</sub> (SEQ ID NO: 47) and CDR<sub>3</sub> (SEQ ID NO: 49) of the heavy chain of PRCA157.
The invention further relates to any of the isolated antibodies or immunoreactive fragments thereof described above, the antibody binding to B7-H3 which is endogenously expressed on the surface of a cancer cell.
The invention further relates to any of the isolated antibodies or immunoreactive fragments thereof described above, wherein the antibody that binds to B730 H3 is internalized upon binding to B7-H3 expressed on the surface of a cancer cell.
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The invention further relates to any of the isolated antibodies or immunoreactive fragments thereof described above, which are a humanized monoclonal antibody.
The invention further relates to any of the isolated antibodies or immunoreactive fragments thereof described above, the antibody being a modified antibody comprising a variant human IgGl Fe region, wherein the variant human IgGl Fe region comprises at least one modification of amino acids with respect to the Fe region of the original antibody molecule, the amino acid modification (s) comprising an amino acid modification (s) that alter the affinity or avidity of the variant Fe region to bind to an FcyR such that the modified antibody exhibits enhanced effector function relative to the original antibody.
The invention further relates to any of the isolated antibodies or immunoreactive fragments thereof described above, in which the modification of the Fe region comprises:
(A) at least one substitution selected from the group consisting of:
<td> (1)</td><td>F243L;</td><td> (5)</td><td>Y300L;</td>
<td> (2)</td><td>D270E;</td><td> (6)</td><td>V305I;</td>
<td> (3)</td><td>R292P;</td><td> (7)</td><td>A330V; Y</td>
<td> (4)</td><td>S298N;</td><td> (8)</td><td>P396L;</td>
(B) at least one substitution of two amino acid residues, the substitutions being selected from the group consisting of:
(1) F243LyP396L;
(2) F243L and R292P; and (3) R292P and V305I;
(C) at least one substitution of three amino acid residues, the substitutions being selected from the group consisting of:
(1) F243L, R292P and Y300L;
(2) F243L, R292P and V305I;
(3) F243L, R292P and P396L; Y
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(4) R292P, V305I and P396L;
IMPI
INSTITUTO MEXICANO PE LA MONEDAD INDUSTRIAL (D) at least one substitution of four amino acid residues, the substitutions being selected from the group consisting of:
(1) F243L, R292P, Y300L and P396L; and (2) F243L, R292P, V305I and P396L;
or (E) a substitution of at least the five amino acid residues: F243L, R292P, Y300L, V305I and P396.
The invention further relates to the antibody described above, the antibody comprising substitutions of:
(A) F243L, R292P and Y300L;
(B) L235V, F243L, R292P, Y300L and P396L; or (C) F243L, R292P, Y300L, V305I and P396L.
The invention further relates to the antibody described above, the antibody comprising:
(A) a variable domain comprising CDRi (SEQ ID NO: 5), CDR2 (SEQ *) NO: 7) and CDR<sub>3</sub> (SEQ ID NO: 9) of the light chain of BRCA84D and CDRi (SEQ ID NO: 13), CDR<sub>2</sub> (SEQ ID NO: 15) and CDR<sub>3</sub> (SEQ ID NO: 17) from BRCA84D heavy chain; and (B) a modification of the Fe region comprising the substitutions: L235V, F243L, R292P, Y300L and P396L.
The invention further relates to the antibody described above, the antibody being a chimeric antibody or a humanized antibody.
The invention further relates to the isolated antibodies or immunoreactive fragments thereof described above, the antibody comprising:
(A) a variable light chain having the VL amino acid sequence of hBRCA84D-2 (SEQ ID NO: 89);
(B) a variable heavy chain having the VH amino acid sequence of hBRCA84D-2 (SEQ ID NO: 99); and (C) an Fe region having the substitutions: L235V, F243L, R292P, Y300L and P396L.
MEXICAN INSTITUTE
FROM THE PMPWDAD C ~ w INDUSTRIAL
The invention further relates to a hybridoma that secretes a monoclonal antibody that specifically binds to an extracellular domain of B7-H3, in which the antibody competes for binding to B7-H3 with any of the antibodies: BRCA69D, BRCA84D or PRCA 157.
The invention further relates to a nucleic acid molecule encoding any of the isolated antibodies or immunoreactive fragments described above.
The invention further relates to a double affinity redirecting reagent (DART ™), the reagent comprising:
(A) a polypeptide chain I comprising an immunoglobulin VL epitope binding domain specific for binding to B7-H3 and a specific VH epitope binding domain for binding to a molecule other than B7-H3; and (B) a polypeptide chain II comprising an immunoglobulin VH epitope binding domain specific for binding to B7-H3 and a specific VL epitope binding domain for binding to the non-B7-H3 molecule;
wherein polypeptide chains I and II are associated with each other so that they form functional epitope-binding domains that can bind to B7-H3 and the non-B7-H3 molecule.
The invention further relates to the double affinity redirecting reagent (DART ™) described above, in which the molecule other than B7-H3 to which the DART ™ can bind is a hapten, and particularly in which the hapten is isothiocyanate fluorescein.
The invention further relates to the double affinity redirection reagent (DART ™) described above, wherein the molecule other than B7-H3 to which the DART ™ can bind is a T cell receptor or the NKG2D receptor.
The invention further relates to the double affinity redirecting reagent (DART ™) described above, wherein the molecule other than B7-H3 to which DART ™ can bind is a tumor associated antigen, and particularly, wherein the tumor associated antigen is selected from the group consisting of A33; ADAM-9; ALCAM; BAGE; beta-catenin; CA125; carboxypeptidase M; CD103; CD19; CD20; CD22; CD23; CD25; CD27; CD28; CD36; CD40 / CD154; CD45; CD46; CD5; CD56; CD79a / CD79b; CDK4; CEA; CTLA4; cytokeratin 8; EGF-R; EphA2; ErbBl; ErbB3; ErbB4; GAGE-1; GAGE-2; GD2 / GD3 / GM2; gplOO; HER-2 / neu; Human papillomavirus E6; E7 from human papillomavirus; alpha-V-beta-6 integrin; JAM-3; KID3; KID31; KSA (17-l<sup>to</sup>); LUCA-2; MAGE-1; MAGE-3; MART; MUC-1; MUM-1; N14
<img file="MX345232B_D0014.tif" />
IMPI wsTnyroMixicANo
M LA FROfudaD industrial acetylglucosaminyltransferase; oncostatin M; pl5; PIPE; PSA; PSMA; ROR1; sTn; TNF-β receptor; TNF-α receptor; TNF-γ receptor; transferrin receptor and VEGF receptor.
The invention further relates to a nucleic acid molecule encoding a polypeptide chain of any of the double affinity redirection reagents (DART ™) described above.
The invention further relates to a pharmaceutical composition comprising (i) a therapeutically effective amount of any of the isolated antibodies or immunoreactive fragments or double affinity redirecting reagents (DART ™) described above and (ii) a pharmaceutically acceptable carrier.
The invention further relates to the pharmaceutical composition described above, wherein the antibody is a humanized antibody comprising:
(A) a variable domain comprising CDRi (SEQ ID NO: 5), CDR2 (SEQ ID NO: 7) and CDR<sub>3</sub> (SEQ ID NO: 9) of the light chain of BRCA84D and CDRi (SEQ ID NO: 13), CDR<sub>2</sub> (SEQ ID NO: 15) and CDR<sub>3</sub> (SEQ ID NO: 17) from BRCA84D heavy chain; and (B) a modification of the Fe region comprising the substitutions: L235V, F243L, R292P, Y300L and P396L.
The invention further relates to the pharmaceutical composition described above, wherein the antibody is a humanized antibody comprising:
(A) a variable light chain having the VL amino acid sequence of hBRCA84D-2 (SEQ ID NO: 89);
(B) a variable heavy chain having the VH amino acid sequence of hBRCA84D-2 (SEQ ID NO: 99); and (C) an Fe region having the substitutions: L235V, F243L, R292P, Y300L and P396L.
The invention further relates to any of the pharmaceutical compositions described above, further comprising one or more additional anticancer agents, and particularly wherein the additional anticancer agent is a chemotherapeutic agent, a radiotherapeutic agent, a hormonal therapeutic agent, or an immunotherapeutic agent. .
The invention further relates to the use of any of the described antibodies or immunoreactive fragments or double affinity redirection reagents (DART ™).
<img file="MX345232B_D0015.tif" />
IMPI
INSTITUTO MEXICANO • t THE «INDUSTRIAL OMITY previously in the diagnosis of cancer, in which the isolated antibody, immunoreactive fragment or DART ™ is detectably labeled.
The invention further relates to the use described above characterized in that the cancer is characterized by the presence of a cancer cell selected from the group consisting of a cell of an adrenal gland tumor, a cancer associated with AIDS, a soft tissue sarcoma alveolar, an astrocytic tumor, bladder cancer, bone cancer, a brain and spinal cord cancer, a metastatic brain tumor, a breast cancer, carotid body tumors, a cervical cancer, a chondrosarcoma, a chordoma, a chromophobic renal cell carcinoma, a clear cell carcinoma, a colon cancer, a colorectal cancer, a 10 benign cutaneous fibrous histiocytoma, a desmoplastic small round cell tumor, a ependymoma, an Ewing tumor, an extraskeletal myxoid chondrosarcoma, a fibrogenesis imperfect bone, a fibrous dysplasia of the bone, a cancer of the gallbladder or bile duct, gastric cancer, a gestational trophoblastic disease, a germ cell tumor, a head and neck cancer, hepatocellular carcinoma, an islet cell tumor, a sarcoma of
Kaposi, a kidney cancer, a leukemia, a lipoma / benign lipomatous tumor, a liposarcoma / malignant lipomatous tumor, a liver cancer, a lymphoma, a lung cancer, a medulloblastoma, a melanoma, a meningioma, a multiple endocrine neoplasia , a multiple myeloma, a myelodysplastic syndrome, a neuroblastoma, neuroendocrine tumors, an ovarian cancer, a pancreatic cancer, a papillary thyroid carcinoma, a parathyroid tumor, a pediatric cancer, a peripheral nerve sheath tumor, a pheochromocytoma, a pituitary tumor, a prostate cancer, a posterior uveal melanoma, a rare hematologic disorder, a renal metastatic cancer, a rhabdoid tumor, a rhabdomyosarcoma, a sarcoma, a skin cancer , a soft tissue sarcoma, a squamous cell cancer, a stomach cancer, a synovial sarcoma, a testicular cancer, a tunic carcinoma, a thymoma, a metastatic thyroid cancer, and a uterine cancer.
The invention further relates to the use of any of the above described antibodies or immunoreactive fragments or double affinity redirection reagents (DART ™) in the preparation of a medicament for the treatment or prevention of cancer in a patient. The invention further relates to such uses characterized in that the cancer is characterized by the presence of a cancer cell selected from the group consisting of a cell of an adrenal gland tumor, a cancer associated with AIDS, an alveolar soft tissue sarcoma , an astrocytic tumor, bladder cancer, bone cancer, a brain cancer and 16
<img file="MX345232B_D0016.tif" />
IMPI
INSTITUTO MEXICANO D £ LA PROPTBDAD INDUSTRIAL spinal cord, metastatic brain tumor, breast cancer, carotid body tumors, cervical cancer, chondrosarcoma, chordoma, chromophobic renal cell carcinoma, clear cell carcinoma, a colon cancer, a colorectal cancer, a cutaneous benign fibrous histiocytoma, a desmoplastic small round cell tumor, an ependymoma, a Ewing tumor, an extraskeletal myxoid chondrosarcoma, fibrogenesis imperfecta of bone, fibrous dysplasia of bone, gallbladder or bile duct cancer, gastric cancer, gestational trophoblastic disease, germ cell tumor, head and neck cancer, hepatocellular carcinoma, islet cell tumor , a Kaposi sarcoma, a kidney cancer, a leukemia, a benign lipoma / lipomatous tumor, a liposarcoma / malignant lipomatous tumor, a liver cancer, a lymphoma, a lung cancer, a medulloblastoma, a melanoma, a meningioma, a multiple endocrine neoplasia, a multiple myeloma, a myelodysplastic syndrome, a neuroblastoma, neuroendocrine tumors, an ovarian cancer, a pancreatic cancer, a papillary thyroid carcinoma, a parathyroid tumor, a pediatric cancer, a tumor peripheral nerve sheath, a pheochromocytoma, a pituitary tumor, a prostate cancer, a posterior uveal melanoma, a rare hematologic disorder, a renal metastatic cancer, a rhabdoid tumor, a rhabdomyosarcoma, a sarcoma, a skin cancer, a soft tissue sarcoma, a squamous cell cancer, a stomach cancer, a synovial sarcoma, a testicular cancer, a thymic carcinoma, a thymoma, a metastatic thyroid cancer and a uterine cancer.
The invention further relates to the uses described above characterized in that the use further comprises the administration of one or more additional cancer therapies selected from the group consisting of chemotherapy, immunotherapy, radiation therapy, hormonal therapy and surgery.
Brief description of the drawings:
Figures 1A-1B show the results of IHC investigations performed using normal pancreas, liver, lung and colon tissue samples with BRCA84D at 0.625 pg / ml and 0.078 pg / ml (Figure 1A) and heart, kidney and gland tissue. normal adrenal with BRCA84D at 0.625 pg / ml (Figure IB).
Figure 2 shows the results of IHC investigations performed using cancerous pancreas, breast, colon and lung tissue samples with BRCA84D at 0.625 pg / ml and 0.078 pg / ml.
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BIDUSTMAL ***
Figures 3A-3D show dose-dependent redirected killing mediated by the antibodies of the present invention. Figures 3A-3B show the dose-dependent redirected killing of A498 renal carcinoma cells (with PBMC resting at 18 hours (LDH)) by monoclonal antibodies reactive against B7-H3 (ratio of effector: target of 20: 1) (Figure 3A: BRCA68D, BRCA69D, PRCA157, GB8, TCR-4420; Figure 3B: OVCA22, BRCA84D, TDH6, TES7, TCR-4420). Figures 3C-3D show the dose-dependent redirected killing of A549 lung cancer cells (with PBMC resting at 18 hours (LDH)) by monoclonal antibodies reactive against B7-H3 (effector: target ratio of 30 : 1) (Figure 3C: BRCA84D, OVCA22, PRCA157, TES7; Figure 3D: TDH6, BRCA68D, BRCA69D).
Figures 4A-4B show the abilities of anti-B7-H3 antibodies to bind soluble B7H3-2Ig (Figure 4A) and soluble B7H3-4Ig B7-H3 (Figure 4B) (antibody concentration is 100 nM). Legend: (A) BLA8; (B) BRCA165; (C) BRCA68D; (D) BRCA69D; (E) BRCA84D; (F) GB8; (G) LUCA1; (H) LUCA50; (I) OVCA21; (J) OVCA22; (K) PA20; (L) PRCA123; (M) SG24; (N) SG27; (O) STO9; (P) TDH4 (184-192); (Q) TDH4; (R) TDH5; (S) TES7. The vertical position of the legend is correlated with the position of the corresponding curve.
Figures 5A-5S demonstrate the binding affinity between antigens in solution and captured monoclonal antibodies (solid lines; B7-H3 (4Ig) 100 nM; dashed lines; B7-H3, 100 nM).
Figures 6A-6I show the results of BIACORE ™ analysis of antibodies to B7-H3 immobilized with B7-H3-2Ig (dashed gray lines) or B7-H3-4Ig (solid black lines). Antibodies were titrated from 0.063 µΜ to 1 µΜ. Time is in seconds.
Figure 7 provides a comparison BIACORE ™ analysis of PRCA157, BRCA69D, BLA8, PA20, BRCA84D, GB8 and SG27 antibodies.
Figure 8 provides a BIACORE ™ analysis demonstrating that BRCA68D, BRCA69D and PRCA 157 do not compete with BRCA84D for binding to human B7-H3.
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MWUCANO INSTITUTE OF INDUSTRIAL PROPERTY
Figures 9A-9B show the results of studies on the ability of the anti-B7-H3 antibodies of the present invention to internalize upon binding to cancer cells (Figure 9A, prostate CSC cells; Figure 9B, Hs700t pancreatic cells).
Figures 10A-10F show the ability of the anti-B7-H3 antibodies of the present invention to cross-link with each other thereby revealing overlapping or distinct epitopes. A ten-fold excess of competitor antibody was used.
Figures 11A-1 IB show the alignment of the amino acid residues of the variable light chains (Figure HA) or the variable heavy chains (Figure 11B) of BRCA84D and its humanized derivative, hBRCA84D.
Figure 12 shows the relative binding affinities of the hBRCA84D light chain derivatives BRCA84D-3VL, BRCA84D-4VL and BRCA84D-5VL for human B7-H3.
Figure 13 shows the relative binding affinities of the hBRCA84D heavy chain derivatives BRCA84D-2VH, BRCA84D-3VH and BRCA84D-4VH for human B7-H3.
Figure 14 shows the relative binding affinities of (1) antibodies containing hBRCA84D-2VL and hBRCA84D-2VH (assays 1 and 2), (2) chimeric BRCA84D, (3) antibody containing hBRCA84D-5VL and chimeric BRCA84D-HC. and (4) antibody containing hBRCA84D-5VL and hBRCA84D-2VH.
Figure 15 shows the ability of Fe-modified humanized anti-B7-H3 antibodies to inhibit tumor growth of HT-1197 urinary bladder carcinoma cells in vivo in a murine xenograft model system. The hBRCA84D-2 antibody with modified Fe (comprising the Fe modifications L235V, F243L, R292P, Y300L and P396L) was administered to mice (at a dose of 1 pg / kg, 10 pg / kg or 20 pg / kg) 7 days, 14 days, 21 days and 28 days after the implantation of the cancer cells.
Figure 16 shows the ability of Fe-modified humanized anti-B7-H3 antibodies to inhibit tumor growth of A498 renal carcinoma cells in vivo in a murine xenograft model system. The antibody to hBRCA84D-2 with modified Fe (comprising the Fe modifications L235V, F243L, R292P, Y300L and P396L) was administered to mice (at a dose of 1 pg / kg, 10 pg / kg or 20 pg / kg) 7 days, 14 days, 21 days and 28 days after implantation of cancer cells.
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MEXICAN INSTITUTE
Dt LA BROm »AD
INDUSTRIAL *!
Figures 17A-17D demonstrate the ability of DART ™ hBRCA84D-2 / anti-TCR ("T-DART ™") to mediate the targeted killing of SK-MES-1 lung cancer cells, A498 renal carcinoma cells, of LNCaP prostate cancer and UACC-62 melanoma cells.
Figures 18A-18C show the pharmacokinetic decrease of anti-B7-H3 mAb in the sera of male hCD16A_FOXNl, mCDlo - / -, tumor-free mice (Figures 18A-18B). Figure 18C shows the predicted pharmacokinetic profiles generated using a 2-compartment model with parameters from the 5 mg / kg dose to 0.1, 0.5.1, 5 and 10 mg / kg.
Figure 19 shows the relative expression of HER2 and PRCA135 by the HT-1197 bladder cancer line.
Figure 20 shows the binding affinity of hBRCA84D anti-B7H3 antibody variants against HT-1197 cells.
Figures 21A-21C show the results of a murine xenograft analysis for HT-1197. Groups of 8 female mice received IgG vehicle or control 10 mg / kg, or cetuximab at a dose of 1, 5 or 15 mg / kg or mAb anti-B7-H3 antibody at a dose of 0.1, 0.5, 1, 5 or 10 mg / kg (Q7D x5). Tumor measurements were made every 3-4 days. Figure 21A shows the ability of the anti-B7-H3 mAb antibody to prevent or inhibit tumor development in the murine xenograft model. Comparisons vs. IgG control: mAb (1 and 5 mg / kg) vs. IgG *** control from day 51; MAb (10 mg / kg) versus IgG ** control from day 48. Figure 2 IB shows the ability of cetuximab to prevent or inhibit tumor development in the murine xenograft model. Cetuximab (7 mg / kg) vs. IgG ** control from day 51; cetuximab (15 mg / kg) vs. IgG *** control from day 58. Figure 21C compares the results obtained at the maximum doses tested.
Figures 22A-22B show the relative expression of HER2 and PMSA by the HT-1376 bladder cancer lineage.
Figure 23 shows the results of a murine xenograft analysis for HT-1376. Groups of mice received vehicle or 1.0 mg / kg of mAb anti-B7-H3 antibody (Q7D x4).
IMPI INSTITUTO MAMCANO DE LA NOEKDAD industrial
Figure 24 shows the results of a murine xenograft analysis for AGS.
Groups of mice received vehicle or mAb anti-B7-H3 antibody 10 mg / kg at a dose of 0.5, 1, 5 or 10 mg / kg (Q7D x5).
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Figure 25 shows the results of an in vitro cytotoxicity assay of A549 lung cancer cells after incubation with anti-B7-H3 variants hBRCA84D, chBRCA84D and hBRCA84 (Fe Vari) (E: T ratio = 25: 1; effector = human PBMC; LDH assay read).
Figure 26 shows the results of a murine xenograft analysis for A549. Groups of mice received vehicle or 1.0 mg / kg of mAb anti-B7-H3 antibody (Q7D x4).
Figure 27 shows the results of a murine xenograft analysis for CaLu3. Groups of mice received 0.5, 1 or 5 mg / kg anti-B7-H3 mAb vehicle or antibody (Q7D x5) or IgG control (10 mg / ml).
Figures 28A-28C show the results of a murine xenograft analysis for melanoma cancer cells LOX-IMVL Groups of 8 female mice received vehicle or control IgG 5 mg / kg, or docetaxel at a dose of 5, 10 or 20 mg / kg or mAb anti-B7H3 antibody at a dose of 0.5, 1, 5 or 10 mg / kg. Figure 28A shows the ability of the anti-B7-H3 mAb antibody to prevent or inhibit tumor development in the murine xenograft model. Figure 28B shows the ability of docetaxel to prevent or inhibit tumor development in the murine xenograft model. Figure 28C compares the results obtained at the maximum doses tested.
Figure 29 shows the result of a murine xenograft analysis for UACC-62 melanoma cancer cells. Groups of mice received 5 mg / kg IgG vehicle or control, or anti-B7-H3 mAb antibody at a dose of 0.5, 1, 5 or 10 mg / kg.
Figures 3OA-3OC show the results of a murine xenograft analysis for 2rv prostate cancer cells. Groups of 8 female mice received IgG vehicle or control 10 mg / kg, or trastuzumab at a dose of 1, 7 or 15 mg / kg or mAb anti-B7-H3 antibody at a dose of 0.5, 1, 5 or 10 mg / kg. Figure 30A shows the ability of the anti-B7H3 mAb antibody to prevent or inhibit tumor development in the murine xenograft model. Figure 30B shows the ability of trastuzumab to prevent or inhibit tumor development in the model of
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MEXICAN INSTITUTE
Df LAnONIDAD INliwriUAl.
<img file="MX345232B_D0018.tif" />
murine xenograft. Figure 30C compares the results obtained at the maximum doses tested.
Figure 31 shows the results of an in vitro cytotoxicity assay of A498 kidney cancer cells after incubation with hBRCA84D, chBRCA84D and hBRCA84 (Fe Vari) variant anti-B7-H3 antibodies (E: T ratio = 25: 1; effector = Human PBMC; LDH assay read).
Figure 32 shows the result of a murine xenograft analysis for A498 kidney cancer cells. Groups of mice received 10 mg / kg IgG vehicle or control, or anti-B7-H3 mAb antibody at a dose of 0.1, 0.5, 1, 5 or 10 mg / kg. Cetuximab (anti-EGRF antibody) was administered to a control group of mice at doses of 1, 7 or 15 mg / kg.
Figures 33A-33B show the result of a murine xenograft analysis for 786-0 kidney cancer cells compared to cetuximab. Groups of mice received 10 mg / kg IgG vehicle or control, or anti-B7-H3 mAb antibody at a dose of 0.1, 0.5, 1, 5 or 10 mg / kg. Cetuximab (anti-EGRF antibody) was administered to a control group of mice at doses of 1, 7 or 15 mg / kg.
Figure 34 shows the result of a murine xenograft analysis for 786-0 kidney cancer cells compared to paclitaxel. Groups of mice received 5 mg / kg IgG vehicle or control, or anti-B7-H3 mAb antibody at a dose of 0.1, 0.5, 1, 5 or 10 mg / kg. Paclitaxel was administered to a control group of eight such mice at a dose of 2.5 mg / kg.
Detailed description of the invention:
The present invention relates to antibodies and their fragments that are immunoreactive against the mammalian, and more particularly, human B7-H3 receptor, and to uses thereof, particularly in the treatment of cancer and inflammation. The invention therefore particularly relates to humanized B7-H3-reactive antibodies and their immunoreactive fragments that can mediate, and more preferably enhance, the activation of the immune system against cancer cells that are associated with a variety of human cancers.
I. General techniques
IMPI χτπντο MEXICAN OF INPUSTI1AL PURITY
<img file="MX345232B_D0019.tif" />
The practice of the present invention will employ, unless otherwise indicated, conventional techniques of molecular biology (including recombinant techniques), microbiology, cell biology, biochemistry, and immunology, which are within the skill of the art. Such techniques are fully explained in the literature, such as, Molecular
Cloning: A Laboratory Manual, Third Edition (Sambrook et al. Eds., 2001) Coid Spring Harbor Press, Coid Spring Harbor, NY; Oligonucleotide Synthesis: Methods and Applications (Methods in Molecular Biology), Herdewijn, P., Ed., Humana Press, Totowa, NJ; Oligonucleotide Synthesis (Gait, MJ, Ed., 1984); Methods in Molecular Biology, Humana Press, Totowa, NJ; Cell Biology: A Laboratory Notebook (Cellis, JE, Ed., 1998)
Academic Press, New York, NY; Animal Cell Culture (Freshney, RI, Ed., 1987); Introduction to Cell and Tissue Culture (Mather, JP and Roberts, PE, Eds., 1998) Plenum Press, New York, NY; Cell and Tissue Culture: Laboratory Procedures (Doyle, A. et al., Eds., 1993-8) John Wiley and Sons, Hoboken, NJ; Methods in Enzymology (Academic Press, Inc.) New York, NY; Weir's Handbook of Experimental Immunology (Herzenberg, LA et al. Eds. 1997) Wiley-Blackwell Publishers, New York, NY; Gene Transfer Vectors for Mammalian Cells (Miller, JM et al. Eds., 1987) Coid Spring Harbor Press, Coid Spring Harbor, NY; Current Protocols in Molecular Biology (Ausubel, FM et al., Eds., 1987) Greene Pub. Associates, New York, NY; PCR: The Polymerase Chain Reaction, (Mullís, K. et al., Eds., 1994) Birkháuser, Boston MA; Current PROTOCOLS in Immunology (Coligan, JE
et al, eds., 1991) John Wiley and Sons, Hoboken, NJ; Short Protocols in Molecular Biology (John Wiley and Sons, 1999) Hoboken, NJ; Immunobiology 7 (Janeway, CA et al. 2007) Garland Science, London, UK; Antibodies (P. Finch, 1997) Stride Publications, Devoran, UK; Antibodies: A Practical Approach (D. Catty., Ed., 1989) Oxford University Press, USA, New York NY); Monoclonal Antibodies: A Practical Approach (Shepherd, P. et al. Eds., 2000) Oxford University Press, USA, New York NY; Using Antibodies: A Laboratory Manual (Harlow, E. et al. Eds., 1998) Coid Spring Harbor Laboratory Press, Coid Spring Harbor, NY; The Antibodies (Zanetti, M. et al. Eds. 1995) Harwood Academic Publishers, London, UK); and DeVita, Hellman, and Rosenberg's Cancer: Principles & Practice of Oncology, Eighth Edition, DeVita, V. et al. Eds. 2008, Lippincott Williams &
Wilkins, Philadelphia, ΡΑ.
II. Definitions
IMPI Instituto mixicano • I INDUSTRIAL HTOHITY
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As used herein, the term "B7-H3" refers to a member of the human B7 family of proteins, a type I membrane protein with Ig-type domains also known as CD276. The term "2Ig-B7-H3" indicates the form of B7-H3 that only comprises two Ig-like domains; the term "4Ig-B7-H3" indicates the form of B7-H3 that comprises four Ig-like domains (see, Sun, M. et al. (2002) "Characterization of Mouse and Human B7-H3 Genes", J. Immunol. 168: 6294-6297; Steinberger et al. (2004), "Molecular Characterization Of Human 4Ig-B7-H3, A Member Of The B7 Family With Four Ig-Like Domains", J. Immunol. 2004, 172 (4): 2352-2359 and Castriconi et al. (2004) "Identification Of 4IgB7-H3 As A Neuroblastoma-Associated Molecule That Exerts A Protective Role From An NK CellMediated Lysis, Proc. Nati. Acad. Sci. (USA) 101 (34): 12640-12645). The "TES7" antigen (WO 2008/066691) is an antigen that shares characteristics of 4Ig-B7-H3. Consequently, antibodies that specifically bind to TES7 bind 4Ig-B7-H3. The TES7 antigen can have more than one different epitope, and the epitopes can be non-linear. Several anti-B7-H3 antibodies are known to bind to non-linear epitopes, including some present only in the 4Ig-B7-H3 isoform. It is currently believed that TES7 can be overexpressed in certain cancer cells compared to its normal tissue counterparts.
Agonists, antagonists, and other modulators of B7-H3 function are expressly included within the scope of this invention. These agonists, antagonists, and modulators are polypeptides that comprise one or more of B7-H3 antigenic determining sites, or comprise one or more fragments of such sites, variants of such sites, or peptidomimetic agents of such sites. These B7H37 agonists, antagonists, and modulators are provided in linear or cyclized form, and optionally comprise at least one amino acid residue not commonly found in nature or at least one amide isostere. These compounds can be glycosylated.
More specifically, the term "B7-H3 modulator" as used herein is defined as any compound that (1) can alter or block the interaction between human B7-H3 and its native ligands or an anti-B7 antibody. -H3; (2) can bind to human B7-H3 and its native ligands or an anti-B7-H3 antibody; (3) contains an antigenic site that can be used in the generation of antibodies that can bind to human B7-H3 and its native ligands or an anti-B7-H3 antibody; (4) contains an antigenic site that can be used in the selection of antibodies that can bind to human B7-H3 and its native ligands or a 24
<img file="MX345232B_D0021.tif" />
IMPI
INSTITUTO MEXICANO DI LA PROPERTY INDUSTRIAL anti-B7-H3 antibody; (5) contains an antigenic site that can be used in the generation of antibodies that can alter or block the interaction between human B7-H3 and its native ligands or an anti-B7-H3 antibody; (6) contains an antigenic site that can be used in the selection of antibodies that can alter or block the interaction between human B7-H3 and its native ligands or an anti-B7-H3 antibody. B7-H3 modulators can be "B7-H3 agonists" or "B7-H3 antagonists" depending on whether their activity enhances T-cell activation or inhibits T-cell activation, respectively.
B7-H3 agonists, antagonists, and modulators include B7-H3 variants, B7-H3 peptide antagonists, peptidomimetic agents and small molecules, immunoglobulin variants and anti-B7-H3 antibodies, amino acid variants of human B7-H3 including amino acid substitution, deletion and addition variants, or any combination thereof, and chimeric immunoglobulins. The B7H3 agonists, antagonists, and modulators of this invention are based on the identification of the B7-H3 domains involved in the binding of human B7-H3 to its native ligands or anti-B7-H3 antibodies. Thus, the invention provides B7-H3 agonists, antagonists, and modulators with molecular structures that duplicate or mimic one or more of the anti-B7-H3 antibody-binding domains of human B7-H3.
As used herein, the term "B7-H3 variant" indicates any amino acid variant of human B7-H3, including amino acid substitution, deletion and addition variants, or any combination thereof. The definition encompasses chimeric molecules such as human B7-H3 / non-human chimeras and other hybrid molecules. Also included in the definition is any fragment of a B7-H3 variant molecule that comprises the variant or hybrid region (s) of the molecule.
As used herein, an "antibody" is an immunoglobulin molecule that can specifically bind to a target, such as a carbohydrate, polynucleotide, lipid, polypeptide, etc., through at least one binding site. antigen recognition, located in the variable region of the immunoglobulin molecule. As used herein, the term encompasses not only intact monoclonal or polyclonal antibodies, but also fragments thereof (such as Fab, Fab ', F (ab') 2 Fv), single chain fragments (ScFv), mutants thereof, naturally occurring variants, fusion proteins comprising an antibody part with an antigen recognition site with the required specificity, humanized antibodies, chimeric antibodies,
<img file="MX345232B_D0022.tif" />
"BiTE®", "DART ™" molecules and any other modified configuration of the immunoglobulin molecule comprising an antigen recognition site with the required specificity.
The term "BiTE" (bispecific T-cell scavenger) refers to a single chain polypeptide molecule that has two antigen-binding domains, one of which binds to a T-cell antigen and the second of which binds to an antigen present on the surface of a target (WO 05/061547; Baeuerie, P et al. (2008) "BiTE®: A New Class Of Antibodies That Recruit T Cells, Drugs of the Future 33: 137- 147; Bargou, et al. 2008) "Tumor Regression in Cancer Patients by Very Low Doses of a T Cell-Engaging Antibody", 10 Science 321: 974-977).
The term "DART ™" (double affinity redirecting reagent) refers to an immunoglobulin molecule that comprises at least two polypeptide chains that associate (especially through a covalent interaction) to form at least two epitope-binding sites. , which can recognize the same or different epitopes. Each of the polypeptide chains of a DART ™ comprises an immunoglobulin light chain variable region and an immunoglobulin heavy chain variable region, but these regions do not interact to form an epitope binding site. Instead, the immunoglobulin heavy chain variable region of one (for example, the first) of the DART ™ polypeptide chains interacts with the immunoglobulin light chain variable region of a different DART ™ polypeptide chain (e.g. example, the second) to form an epitope binding site. Similarly, the immunoglobulin light chain variable region of one (eg, the first) of the DART ™ polypeptide chains interacts with the immunoglobulin heavy chain variable region of a different DART ™ polypeptide chain (eg, the second) to form an epitope binding site. The DART ™ can be monospecific, bispecific, trispecific, etc., thus being able to bind simultaneously to one, two, three or more different epitopes (which can be of the same or of different antigens). The DART ™ can be additionally monovalent, bivalent, trivalent, tetravalent, pentavalent, hexavalent, etc., thus being able to bind simultaneously to one, two, three, four, five, six or more molecules. These two attributes of DART ™ (i.e. degree of specificity and valence) can be combined, for example to produce bispecific antibodies (i.e. can bind to two epitopes) that are tetravalent (i.e. can bind to
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INSTITUTO MetICANO »£ THE NOMITY inrustual four sets of epitopes), etc. DART ™ molecules are disclosed in PCT publications WO 2006/113665, WO 2008/157379 and WO 2010/080538. '~ ~' ---- The term "monoclonal antibody" refers to a homogeneous population of antibodies in which the monoclonal antibody is composed of amino acids (naturally occurring or not naturally occurring) that they are involved in the selective binding of an antigen. Monoclonal antibodies are highly specific, targeting a single antigenic site. The term "monoclonal antibody" encompasses not only intact monoclonal antibodies and full-length monoclonal antibodies, but also fragments thereof (such as Fab, Fab ', F (ab') 2 Fv), single chain fragments (ScFv), mutants of the same, 10 fusion proteins comprising an antibody part, humanized monoclonal antibodies, chimeric monoclonal antibodies, and any other modified configuration of the immunoglobulin molecule comprising an antigen recognition site with the required specificity and the ability to bind an antigen. It is not intended to be limited with respect to the origin of the antibody or the manner in which it is prepared (eg, by hybridoma, phage selection, recombinant expression, transgenic animals, etc.). The term includes whole immunoglobulins as well as fragments etc. described above in the definition of "antibody".
The term "humanized antibody" refers to a chimeric molecule, generally prepared using recombinant techniques, that has an antigen-binding site derived from an immunoglobulin from a non-human species and the remaining immunoglobulin structure of the molecule based on the structure and / or the sequence of a human immunoglobulin. The antigen-binding site can comprise either entire variable domains fused onto constant domains or just the complementarity determining regions (CDRs) grafted onto appropriate framework regions in the variable domains. The antigen-binding sites can be wild-type or modified by one or more amino acid substitutions. This eliminates the constant region as an immunogen in human individuals, but the possibility of an immune response against the foreign variable region remains (LoBuglio, AF et al. (1989) "Mouse / Human Chimeric Monoclonal Antibody In Man: Kinetics And Immune Response" , Proc. Nati. Acad. Sci. (USA) 86: 4220-4224). Another approach focuses not only on providing human-derived constant regions, but also on modifying the variable regions to reshape them as closely as possible to human form. The variable regions of both heavy and light chains are known to contain three regions
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INSTITUTO MEXICANO Di LA FROMRDAD industrial complementarity determinants (CDR) whose response varies against the antigens in question and determine the binding capacity, flanked by four framework regions (FR) that are relatively conserved in a given species and that supposedly provide a scaffolding for the CDRs. When preparing non-human antibodies to a particular antigen, the variable regions can be "reshaped" or "humanized" by grafting CDRs derived from non-human antibody onto the FRs present on the human antibody to be modified. The application of this approach to various antibodies has been reported by Sato, K. et al. (1993) Cancer Res 53: 851-856. Riechmann, L. et al. (1988) "Reshaping Human Antibodies for Therapy", Nature 332: 323-327; Verhoeyen, M. et al. (1988) "Reshaping Human Antibodies:
Grafting An Antilysozyme Activity ", Science 239: 1534-1536; Kettleborough, CA et al. (1991) "Humanization Of A Mouse Monoclonal Antibody By CDR-Grafting: The Importance Of Framework Residues On Loop Conformation", Protein Engineering 4: 773-3783; Maeda, H. et al. (1991) "Construction Of Reshaped Human Antibodies With HIV-Neutralizing Activity", Human Antibodies Hybridoma 2: 124-134; Gorman, SD et al. (1991) "Reshaping A Therapeutic CD4
Antibody ”, Proc. Nati. Acad. Sci. (USA) 88: 4181-4185; Tempest, PR et al. (1991) "Reshaping A Human Monoclonal Antibody To Inhibit Human Respiratory Syncytial Virus Infection in vivo", Bio / Technology 9: 266-271; Co, MS et al. (1991) "Humanized Antibodies For Antiviral Therapy", Proc. Nati. Acad. Sci. (USA) 88: 2869-2873; Carter, P. et al. (1992) "Humanization Of An Anti-pl85her2 Antibody For Human Cancer Therapy", Proc. Nati. Acad. Sci. (USA)
89: 4285-4289; and Co, MS et al. (1992) “Chimeric And Humanized Antibodies With Specificity For
The CD33 Antigen, J. Immunol. 148: 1149-1154. In some embodiments, humanized antibodies retain all CDR sequences (eg, a humanized mouse antibody that contains all six CDRs of mouse antibodies). In other embodiments, humanized antibodies have one or more CDRs (one, two, three, four, five, six) that are altered from the original antibody, which are also referred to as one or more CDRs "derived from" one or more CDRs. of the original antibody.
As used herein, an antibody or polypeptide is said to bind "specifically" to a region of another molecule (ie, an epitope) if it reacts or associates more frequently, more rapidly, longer, and longer. / or with higher affinity for that epitope over alternative epitopes. For example, an antibody that specifically binds to an epitope of B7-H3 is an antibody that binds to that epitope of B7-H3 with higher affinity, avidity, more easily and / or for a longer duration than with which it binds to others
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B7-H3 epitopes or non-B7-H3 epitopes. It is also understood by reading this definition that, for example, an antibody (or residue or epitope) that specifically binds to a first target may or may not specifically or preferentially bind to a second target. As such, "specific binding" does not necessarily require (although it may include) exclusive binding. Generally, but not necessarily, reference to binding means "specific" binding.
As used herein, the term "immunologically active" in reference to an epitope that is or "remains immunologically active" refers to the ability of an antibody (eg, an anti-B7-H3 antibody) to binding to the epitope under different conditions, eg, after subjecting the epitope to reducing or denaturing conditions.
Different biological functions are associated with anti-B7-H3 antibodies, including, but not limited to, one or more of: an ability to specifically bind to B7-H3 (and in particular B7-H3 molecules that are expressed on the surfaces of cancer cells, including, but not limited to, kidney, prostate, or lung cancer cells); an ability to competitively inhibit the preferential binding of a known anti-B7-H3 antibody to B7-H3, including the ability to preferentially bind to the same B7-H3 epitope to which the parent antibody preferentially binds; an ability to bind to a part of B7-H3 that is exposed on the surface of a living cell in vitro or in vivo; an ability to bind to a part of B7-H3 that is exposed on the surface of living cancer cells, such as, but not limited to, prostate, lung, or kidney cancer cells; an ability to deliver a chemotherapeutic agent to cancer cells (such as kidney, prostate, or lung cancer cells) that express B7-H3 on their surface; and / or an ability to deliver a detectable marker or therapeutic agent into cancer cells that express B7-H3 on their surface. As discussed herein, the polypeptides (including antibodies) of the invention can have any one or more of these characteristics.
An "anti-B7-H3 equivalent antibody" or "anti-B7-H3 equivalent polypeptide" refers to an antibody or polypeptide that has one or more biological functions associated with an anti-B7-H3 antibody, such as, for example binding specificity.
As used herein, the term "agent" refers to a biological, pharmaceutical, or chemical compound. Non-limiting examples include a simple or complex organic or inorganic molecule, a peptide, a protein, an oligonucleotide, an antibody, a 29
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MEXICAN INSTITUTE41
PROPERTY / industrial ~ £> antibody derivative, antibody fragment, a vitamin derivative, a carbohydrate, a toxin or a chemotherapeutic compound. Various compounds can be synthesized, eg, small molecules and oligomers (eg, oligopeptides and oligonucleotides), and synthetic organic compounds based on various core structures. In addition, various natural sources can provide compounds for selection, such as plant or animal extracts, and the like.
The agents used in the methods of this invention can be randomly selected or rationally selected or designed. As used herein, an agent is said to be randomly selected when the agent is chosen without consideration or prior knowledge of the amino acid residues or other specific chemical residues involved in the association of the molecule with its (s ) native binding partner (s) or known antibodies. An example of a randomly selected agent is an agent that is identified through the use and examination of a chemical library or a peptide combinatorial library.
As used herein, an agent is said to be rationally selected or designed when the agent is chosen in a non-random manner that takes into account the sequence of the target site and / or its conformation in relation to the agent action. With regard to anti-B7-H3 agents, it is currently believed that there are at least three epitopes on B7-H3 against which antibodies can be generated and therefore at least three sites of action for agents that block the B7-H3 / anti-interaction. -B7-H3. This invention also encompasses agents that act at the interaction sites between B7-H3 and its native binding partner, although other ligands and their active B7-H3 interaction sites are also encompassed within the scope of this invention, whether or not they are known. currently as if they are subsequently identified. Agents can be rationally selected or rationally designed using the peptide sequences that constitute the contact sites of the receptor / ligand complex and / or B7-H3 / anti-B7-H3 antibody. For example, a rationally selected peptide agent can be a peptide whose amino acid sequence is identical to an epitope that appears on B7-H3 as displayed on the surface of a living cell in its native environment. Such an agent will reduce or block the association of the anti-B7-H3 antibody with B7-H3, or the association of B7-H3 with its native ligand, as desired, by binding to the anti-B7-H3 antibody or to the native ligand.
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OI The nOHCOAO tV ^ J j
INDUSTRIAL
As used herein, the term "labeled", with respect to an antibody, is intended to encompass direct labeling of the antibody by coupling (ie, physical binding) of a detectable substance, such as a radioactive agent or a fluorophore (for example phycoerythrin (PE) or fluorescein isothiocyanate (also known as fluoroisothiocyanate or FITC)) to the antibody, as well as indirect labeling of the probe or antibody by reactivity with a detectable substance.
As used herein, the term "association", with respect to an antibody, includes the covalent and non-covalent binding or fixation of an agent (eg, chemotherapeutic agent) to the antibody. The antibody can associate with an agent (eg, chemotherapeutic agent) by direct binding or indirect binding by attachment to a common platform, in such a way that the antibody directs the agent's localization to the cancer cell to which the antibody binds and in which the antibody and the agent do not dissociate substantially under physiological conditions such that the agent does not target the same cancer cell to which the antibody binds or in such a way that the potency of the agent is not decreased.
The term "biological sample" encompasses a variety of sample types obtained from an individual and can be used in a diagnostic or monitoring assay. The definition encompasses saliva, blood and other liquid samples of biological origin, solid tissue samples such as a biopsy sample or tissue cultures or cells derived therefrom, and the progeny thereof, for example, cells obtained from a sample of tissue removed from an individual suspected of having cancer, in preferred embodiments from ovarian, lung, prostate, pancreas, colon and breast tissue. The definition also includes samples that have been manipulated in any way after being obtained, such as by treatment with reagents, solubilization, or enrichment for certain components, such as proteins or polynucleotides, or embedding in a solid or semi-solid matrix for sectional cutting purposes. The term "biological sample" encompasses a clinical sample, and also includes cells in culture, cell supernatants, cell lysates, serum, plasma, biological fluid, and tissue samples.
The term "host cell" includes an individual cell or cell culture that may be or has been a recipient for vector (s) for incorporation of polynucleotide inserts. Host cells include the progeny of an individual host cell, and the progeny may not necessarily be completely identical (in morphology or genomic DNA complement) to the
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INSTITUTO MEXICANO Di LA MOLD INDUSTRIAL original progenitor cell due to natural, accidental or deliberate mutation. A host cell includes cells transfected in vivo with a polynucleotide (s) of this invention. -
As used herein, the term "retard the development of metastasis" means to delay, hinder, slow down, retard, stabilize and / or postpone the development of metastasis. This delay can be of varying lengths of time, depending on the history of the cancer and / or the individual being treated. As is apparent to one of ordinary skill in the art, a sufficient or significant delay may, in fact, encompass prevention, as the individual does not develop metastasis.
As used herein, an "effective amount" of a pharmaceutical composition, in one embodiment, is an amount sufficient to elicit beneficial or desired results including, without limitation, clinical results such as shrinkage of tumor size (in the cancer context, for example breast or prostate cancer), delay in the growth of cancer cells, delay in the development of metastasis, decrease in symptoms resulting from the disease, increase in the quality of life of those suffering from the disease, decrease the dose of other medications required to treat the disease, potentiation of the effect of another medication such as by targeting and / or internalization, delay of the progression of the disease and / or prolongation of the survival of the individuals. An effective amount can be administered in one or more administrations. For purposes of this invention, an effective amount of drug, compound, or pharmaceutical composition is an amount sufficient to reduce the proliferation of (or destroy) cancer cells and to reduce and / or delay the development, or growth, of cancer cell metastases. , either directly or indirectly. In some embodiments, an effective amount of a drug, compound, or pharmaceutical composition may or may not be achieved in conjunction with another drug, compound, or pharmaceutical composition. Thus, an "effective amount" can be considered in the context of administering one or more chemotherapeutic agents, and an individual agent can be considered to be administered in an effective amount if, together with one or more other agents, it can or is achieved. a desirable result. Although individual needs vary, determining optimal ranges of effective amounts of each component is within the skill of the art. Typical dosages comprise 0.1 to 100 mg / kg / body weight. Preferred dosages comprise 1 to 100 mg / kg / body weight. Most preferred dosages comprise 10 to 100 mg / kg / body weight.
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MEXICAN INSTITUTE
BE THE BIDUSTRlAL PROPERTY
As used herein, a nucleic acid molecule or agent, antibody, composition or cell, etc., is said to be "isolated" when that nucleic acid molecule, agent, antibody, composition or cell, etc., is said to be "isolated". it is substantially separate from nucleic acid molecules, antibodies, agents, compositions or cells, etc. contaminants that are naturally present in their original source.
The term "individual" refers to a vertebrate animal, preferably a mammal. Mammals include, but are not limited to, humans, farm animals, sports animals, pets, primates, mice, and rats. In the most preferred embodiment, the term "individual" indicates a human.
The terms "polypeptide", "oligopeptide", "peptide" and "protein" are used interchangeably herein to refer to polymers of amino acids of any length. The polymer can be linear or branched, can comprise modified amino acids, and can be interrupted by compounds other than amino acids. The terms also encompass an amino acid polymer that has been modified naturally or by intervention; for example, disulfide bond formation, glycosylation, lipidation, acetylation, phosphorylation, or any other manipulation or modification, such as conjugation with a labeling component. Also included within the definition are, for example, polypeptides containing one or more analogs of an amino acid (including, for example, unnatural amino acids, etc.), as well as other modifications known in the art. It is understood that since the polypeptides of this invention are antibody-based, the polypeptides can be produced as individual chains or as associated chains.
Peptidomimetic agents of the B7-H3 agonists, antagonists, and peptide modulators (including anti-B7-H3 antibodies) described herein are encompassed within the scope of the invention. Such peptidomimetic agents include peptides in which at least one amino acid residue is replaced by an amino acid residue not commonly found in nature, such as the D-isomer of the amino acid or an N-alkylated species of the amino acid. In other embodiments, peptidomimetic agents are constructed by substituting at least one amide bond (-C (= O) -NH-) in a B7-H3 peptide agonist, antagonist, or modulators with an amide isostere. Suitable amide isosters include -CH2-NH-, -CH2-S-, CH<sub>2</sub>-S (O) -, -CH<sub>2</sub>-SW)<sub>2</sub>-, -CH2-CH2-, -CH = CH- (E or Z form), -C (= O) -CH<sub>2</sub>-, -CH (CN) -NH-, C (OH) -CH<sub>2</sub>- and -OC (= O) -NH-. Amide bonds in an agonist, antagonist, or modulator
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INSTITUTO MEXICANO oe LA PROPERTY ί
INDUSTRIAL M¿ ** P * n * 5 peptide from B7-H3 that are suitable candidates for substitution by amide isosters include linkages that can be hydrolyzed by endogenous esterases or proteases of the intended subject for treatment with peptide agonist, antagonist, or modulator by B7-H3.
As used herein, the term "substantially pure" refers to material that is at least 50% pure (ie, free of contaminants), more preferably at least 90% pure, more preferably pure. at least 95%, more preferably at least 98% pure, more preferably at least 99% pure, and most preferably greater than 99% pure.
As used herein, the term "toxin" refers to any substance that elicits an adverse response within a cell. For example, a toxin directed at a cancer cell will have an adverse, sometimes detrimental effect on the cancer cell. Examples of toxins include, but are not limited to, a taxane, a maytansinoid, an auristatin (e.g., monomethyl auristatin (MMAE), monomethyl auristatin F (MMAF), auristatin E (AE), etc.) (such as the disclosed in US Patent Nos.<sup>08 </sup>5,208,020; 5,416,064; 6,333,410; 6,340,701; 6,372,738; 6,436,931; 6,441,163; 6,596,757; 7,276,497; 7,585,857 or 7,851,432), a calicheamicin, an anthracycline (eg, doxorubicin), a CC-1065 analog, docetaxel ,; cathepsin B or E; ricin, gelonin, Pseudomonas exotoxin, diphtheria toxin, and RNase; radiolabeled antibodies (for example, conjugated to thiuxetane or labeled with a toxic radioisotope (for example,<sup>90</sup>Y; <sup>131</sup>I, <sup>l77</sup>Lu, <sup>186</sup>Re, <sup>188</sup>Re, <sup>211</sup>TO THE <sup>212</sup>Bi, <sup>213</sup>Bi, <sup>225</sup>Ac, etc.).
As used herein, the terms "treatment" or "treat" indicate an approach to obtaining a beneficial or desired result including, and preferably, a beneficial or desired clinical result. Such beneficial or desired clinical outcomes include, but are not limited to, one or more of the following: reduce the proliferation of (or destroy) cancer or other diseased cells, reduce the metastasis of cancer cells found in cancers, shrink the tumor, decrease the symptoms resulting from the disease, increase the quality of life of those who suffer from the disease, decrease the dose of other drugs required to treat the disease, delay the progression of the disease and / or prolong the survival of individuals.
As used herein, the term cancer is intended to encompass cancers characterized by the presence of a cancer cell selected from the group that 34
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IIWITUT »MfXJCANO • E THE industrial unit consists of a cell from an adrenal gland tumor, a cancer associated with AIDS, an alveolar soft tissue sarcoma, an astrocytic tumor, bladder cancer (squamous cell carcinoma and transitional cell carcinoma ), bone cancer (adamantinoma, aneurysmal bone cyst, osteochondroma, osteosarcoma), a brain and spinal cord cancer, a metastatic brain tumor, a breast cancer, carotid body tumors, a cervical cancer, a chondrosarcoma, a chordoma, a chromophobic renal cell carcinoma, a clear cell carcinoma, a colon cancer, a colorectal cancer, a cutaneous benign fibrous histiocytoma, a desmoplastic small round cell tumor, an ependymoma , Ewing's tumor, extraskeletal myxoid chondrosarcoma, fibrogenesis imperfecta of bone, fibrous dysplasia of bone, gallbladder or bile duct cancer, gastric cancer, a gestational trophoblastic disease, a germ cell tumor, a head and neck cancer, hepatocellular carcinoma, an islet cell tumor, a Kaposi sarcoma, a kidney cancer (nephioblastoma, papillary renal cell carcinoma), a leukemia, a benign lipoma / lipomatous tumor, a liposarcoma / malignant lipomatous tumor, a liver cancer (hepatoblastoma, hepatocellular carcinoma), a lymphoma, a lung cancer, a medulloblastoma, a melanoma, a meningioma, a multiple endocrine neoplasia, a multiple myeloma, a myelodysplastic syndrome, a neuroblastoma, neuroendocrine tumors, an ovarian cancer, a pancreatic cancer, a papillary thyroid carcinoma, a parathyroid tumor, a pediatric cancer, a peripheral nerve sheath tumor, a pheochromocytoma, a pituitary tumor, a prostate cancer, a posterior uveal melanoma, a rare hematological disorder, a renal metastatic cancer, a rhabdoid tumor, a rhabdomyosarcoma, a sarcoma, a skin cancer, a soft tissue sarcoma, a squamous cell cancer, a stomach cancer, a synovial sarcoma, a testicular cancer, a timic carcinoma, a thymoma, a metastatic thyroid cancer and a uterine cancer (carcinoma of the neck uterine, endometrial carcinoma and leiomyoma).
IIL Antibody and Polypeptide Preparation Methods
Methods of preparing monoclonal antibodies are known in the art. One method that can be used is the method of Kohler, G. et al. (1975) "Continuous Cultures Of Fused Cells Secreting Antibody Of Predefined Specificity", Nature 256: 495-497 or a modification thereof. Normally, monoclonal antibodies are raised in non-human species, such as mice. In general, a mouse or rat is used for immunization, but other animals can also be used. Antibodies are produced by immunizing mice with an immunogenic amount of cells, cell extracts, or protein preparations containing
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MEXICAN INSTITUTE
M THE INDUSTRIAL MYOPISDAC
Human B7-H3. The immunogen can be, but is not limited to, primary cells, cultured cell lines, cancer cells, nucleic acids, or tissue. In one embodiment, human lung carcinoma cells are used. Cells used for immunization, eg, human stomach or pancreatic adenocarcinoma or testicular cells, can be cultured for a period of time (eg, at least 24 hours) prior to use as an immunogen. The cells (eg, human testicular, stomach, or pancreatic adenocarcinoma cells) can be used as immunogens by themselves or in combination with a non-denaturing adjuvant, such as Ribi. In general, the cells should be kept intact and preferably viable when used as immunogens. Intact cells can allow antigens to be better detected than cells broken by the immunized animal. The use of denaturing or harsh adjuvants, eg Freud's adjuvant, can disrupt cells and is therefore not recommended. The immunogen may be administered multiple times at periodic intervals such as biweekly, or weekly, or it may be administered in such a way as to maintain viability in the animal (eg, in recombinant tissue).
In one embodiment, monoclonal antibodies that bind to B7-H3 are obtained using host cells that overexpress B7-H3 as an immunogen. Such cells include, by way of example and not limitation, human lung carcinoma cells and human colon cancer cells.
To monitor the antibody response, a small biological sample (eg, blood) can be obtained from the animal and tested for the antibody titer against the immunogen. The spleen and / or several large lymph nodes can be removed and dissociated into individual cells. If desired, spleen cells can be examined (after removal of cells that do not specifically adhere) by applying a cell suspension to a plate or well coated with the antigen. B cells, which express antigen-specific membrane-bound immunoglobulin, will bind to the plate, and are not removed by rinsing with the remainder of the suspension. The resulting B cells, or all dissociated spleen cells, can then be fused with myeloma cells (eg, X63-Ag8.653 and those from the Salk Institute, Cell Distribution Center, San Diego, CA). Polyethylene glycol (PEG) can be used to fuse spleen or lymphocyte cells with myeloma cells to form a hybridoma. The hybridoma is then grown in a selective medium (eg, hypoxanthine, aminopterin, thymidine medium, otherwise known as "HAT medium"). The resulting hybridomas are then plated by limiting dilution, and assayed for 36
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INSTTTUT · MMICANO DC LA PKON1BA * BTOUCTRIAL production of antibodies that specifically bind to the immunogen, using, for example, scanning with FACS (fluorescence activated cell sorting) or mmudótUStó ^ UUnlCS<sup>1 </sup>(IHC). Hybridomas secreting selected monoclonal antibodies are then cultured either in vitro (eg, in tissue culture flasks or hollow fiber reactors), or in vivo (eg, as ascites in mice).
As another alternative to the cell fusion technique, Epstein-Barr virus (EBV) immortalized B cells can be used to produce monoclonal antibodies of the subject invention. The hybridomas are expanded and subcloned, if desired, and the supernatants are assayed for anti-immunogenic activity by standard assay procedures (eg, FACS, IHC, radioimmunoassay, enzyme immunoassay, fluorescence immunoassay, etc. ).
In another alternative, anti-B7-H3 monoclonal antibodies and any other equivalent antibodies can be sequenced and produced recombinantly by any means known in the art (e.g., humanization, use of transgenic mice to produce fully human antibodies, technology of presentation in phage, etc.). In one embodiment, an anti-B7-H3 monoclonal antibody is sequenced and the polynucleotide sequence is then cloned into a vector for expression or propagation. The sequence encoding the antibody of interest can be maintained in a vector in a host cell and the host cell can then be expanded and frozen for future use.
The polynucleotide sequence of the anti-B7-H3 monoclonal antibody and any other equivalent antibody can be used for genetic engineering to generate a "humanized" antibody, to enhance affinity, or other characteristics of the antibody. The general principle in humanizing an antibody involves preserving the basic sequence of the antigen-binding part of the antibody, while exchanging the non-human remainder of the antibody for human antibody sequences. There are four general steps to humanizing a monoclonal antibody. They are: (1) determining the nucleotide and predicted amino acid sequence of the light and heavy variable domains of the starting antibody (2) designing the humanized antibody, that is, deciding which antibody framework region to use during the humanization process ( 3) the humanization methodologies / techniques themselves and (4) the transfection and expression of the humanized antibody. See, for example, US Patent Nos.<sup>you</sup> 4,816,567; 5,807,715; 5,866,692 and 6,331,415.
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MEXICAN INSTITUTE
K THE INDUSTRIAL PROFIWAD
Several "humanized" antibody molecules have been described that comprise an antigen-binding site derived from a non-human immunoglobulin, including chimeric antibodies' having modified rodent or rodent V regions and their associated complementarity determining regions (CDRs) fused. to human constant domains (see, for example, Winter et al. (1991) "Man-made Anditbodies", Nature 349: 293-299; Lobuglio et al. (1989) "Mouse / Human Chimeric Monoclonal Antibody In Man: Kinetics And Immune Response, Proc. Nati. Acad. Sci. (USA) 86: 4220-4224 (1989), Shaw et al. (1987) "Characterization Of A Mouse / Human Chimeric Monoclonal Antibody (17-1 A) To A Colon Cancer Tumor-Associated Antigen", J. Immunol. 138: 4534-4538, and Brown et al. (1987) "Tumor-Specific Genetically Engineered Murine / Human Chimeric Monoclonal Antibody", Cancer Res. 47: 3577-3583). Other references describe rodent CDRs grafted onto a human support framework (FR) region prior to fusion with an appropriate human antibody constant domain (see, for example, Riechmann, L. et al. (1988) "Reshaping Human Antibodies for Therapy ", Nature 332: 323-327, Verhoeyen, M. et al. (1988)" Reshaping Human Antibodies: Grafting An Antilysozyme Activity ", Science 239: 1534-1536, and Jones et al. (1986) "Replacing The Complementarity-Determining Regions In A Human Antibody With Those From A Mouse", Nature 321: 522-525). OR tra reference describes rodent CDRs supported by rodent framework regions assembled recombinantly. See, for example, European Patent Publication No. 519,596. These "humanized" molecules are designed to minimize the unwanted immune response against rodent anti-human antibody molecules, limiting the duration and efficacy of therapeutic applications of these residues in human receptors. Other methods of humanizing antibodies that can also be used are disclosed by Daugherty et al. (1991) "Polymerase Chain Reaction Facilitates The Cloning, CDR-Grafting, And Rapid Expression Of A Murine Monoclonal Antibody Directed Against The CD18 Component Of Leukocyte Integrins", Nucí. Acids Res. 19: 2471-2476 and in US Patent Nos.<sup>you </sup>6,180,377; 6,054,297; 5,997,867 and 5,866,692.
The invention also encompasses single chain variable region ("scFv") fragments of antibodies of this invention, such as mu-anti-B7-H3. Single chain variable region fragments are prepared by joining heavy and / or light chain variable regions using a short binding peptide. Bird et al. (1988) (/ 'Single-Chain Antigen-Binding Proteins ”, Science 242: 423-426) describe an example of binding peptides that create a bridge of approximately 3.5 nm between the carboxy-terminal end of a variable region and the amino-terminal end of τ
lUrau'AA'MMJ:
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INSTITUTO MEXICANO t »LAnora> AO INDUSTRIAL other variable region. Linkers from other sequences have been designed and used (Bird et al. (1988) "Single-Chain Antigen-Binding Proteins", Science 242: 423-426). The linkers can in turn be modified for additional functions, such as drug binding or binding to solid supports. Single-chain variants can be produced either recombinantly or synthetically. For the synthetic production of scFv, an automated synthesizer can be used. For the recombinant production of scFv, a suitable plasmid containing a polynucleotide encoding the scFv can be introduced into a suitable host cell, either eukaryotic, such as yeast, plant, insect, or mammalian cells, or prokaryotic, such as E coli. Polynucleotides encoding the scFv of interest can be prepared by routine manipulations such as polynucleotide ligation. The resulting scFv can be isolated using standard protein purification techniques known in the art.
The invention includes modifications of antibodies and polypeptides that bind to B7-H3 and its agonists, antagonists, and modulators, including functionally equivalent antibodies and polypeptides that do not significantly affect their properties and variants that have enhanced or decreased activity. Modification of polypeptides is routine practice in the art and need not be described in detail herein. Examples of modified polypeptides include polypeptides with conservative amino acid residue substitutions, one or more amino acid deletions or additions that do not significantly detrimentally change functional activity, or the use of chemical analogs. Amino acid residues 20 that can be conservatively substituted for one another include, but are not limited to: glycine / alanine; valine / isoleucine / leucine; asparagine / glutamine; aspartic acid / glutamic acid; serine / threonine; lysine / arginine; and phenylalanine / tyrosine. These polypeptides also include glycosylated and non-glycosylated polypeptides, as well as polypeptides with other post-translational modifications, such as, for example, glycosylation with different sugars, acetylation, and phosphorylation. Preferably, the amino acid substitutions will be conservative, that is, the substituted amino acid will exhibit chemical properties similar to those of the original amino acid. Such conservative substitutions are known in the art, and examples have been provided above. Amino acid modifications can range from changing or modifying one or more amino acids to completely redesigning a region, such as the variable region. Changes in the variable region can alter binding affinity and / or specificity. Other methods of modification include using coupling techniques known in the art, including, but not limited to, enzymatic means, oxidative substitution, and chelation. May
The Mexican IMPI nsrrruTo DE LA PROREDAD industrial modifications, for example, for the fixation of labels for immunoassays, such as the fixation of radioactive residues for radioimmunoassays. Modified polypeptides are prepared using established procedures in the art and can be selected using standard assays known in the art.
The invention also encompasses fusion proteins that comprise one or more fragments or regions of the polypeptides and antibodies of this invention. In one embodiment, a fusion polypeptide is provided comprising at least 10 contiguous amino acids from the light chain variable region and at least 10 amino acids from the heavy chain variable region. In another embodiment, the fusion polypeptide contains a heterologous immunoglobulin constant region. In another embodiment, the fusion polypeptide contains a light chain variable region and a heavy chain variable region from an antibody produced from a publicly deposited hybridoma. For purposes of this invention, an antibody fusion protein contains one or more polypeptide domains that specifically bind to B7-H3 and another amino acid sequence to which it is not attached in the native molecule, for example, a heterologous sequence or a homologous sequence from another region.
An anti-B7-H3 polypeptide, and other B7-H3 agonists, antagonists, and modulators can be created by methods known in the art, eg, synthetically or recombinantly. One method of producing peptide agonists, antagonists, and modulators of B7-H3 involves chemical synthesis of the polypeptide, followed by treatment under appropriate oxidative conditions to obtain the native conformation, ie, the correct disulfide linkages. This can be accomplished using methodologies well known to those of skill in the art (see, for example, Kelley, RF et al. (1990) In: Genetic Engineering Principles and Methods, Setlow, JK Ed., Plenum Press, NY, vol 12, pp. 1-19, Stewart, JM et al. (1984) Solid Phase Peptide Synthesis, Pierce Chemical Co., Rockford, IL; see also US Patent Nos.<sup>08</sup> 4,105,603; 3,972,859; 3,842,067 and 3,862,925).
The polypeptides of the invention can be conveniently prepared using solid phase peptide synthesis (Merrifield, B. (1986) "Solid Phase Synthesis", Science 232 (4748): 341-347; Houghten, RA (1985) "General Method For The Rapid Solid-Phase Synthesis Of Large Numbers Of Peptides: Specificity Of Antigen-Antibody Interaction At The Level Of Individual Amino Acids ", Proc. Nati. Acad. Sci. (USA) 82 (15): 5131-5135; Ganesan, TO. (2006) "Solid-Phase Synthesis In The Twenty-First Century", Mini Rev. Med. Chem. 6 (1): 3-10).
<img file="MX345232B_D0031.tif" />
IMPI
MEXICAN INSTITUTE
Say INDUSTRIAL PROPERTY
In yet another alternative, fully human antibodies can be obtained through the use of commercially available mice that have been engineered to express specific human immunoglobulin proteins. Transgenic animals that are designed to produce a more desirable (eg, 5 fully human antibodies) or more robust immune response can also be used for the generation of human or humanized antibodies. Examples of such technology are Xenomouse ™ (Abgenix, Inc., Fremont, CA) and HuMAb-Mouse® and TC Mouse ™ (both from Medarex, Inc., Princeton, NJ).
In an alternative, antibodies can be recombinantly prepared and expressed using any method known in the art. Antibodies can be prepared recombinantly by first isolating the antibodies prepared from host animals, obtaining the gene sequence, and using the gene sequence to express the antibody recombinantly in host cells (eg, CHO cells). Another method that can be employed is to express the antibody sequence in transgenic plants (eg tobacco) or milk. Suitable methods for expressing antibodies recombinantly in plants or in milk have been reported (see, for example, Peeters et al. (2001) "Production Of Antibodies And Antibody Fragments In Plañís", Vaccine 19: 2756; Lonberg, N. et al. (1995) "Human Antibodies From Transgenic Mice", Int. Rev. Immunol 13: 65-93, and Pollock et al. (1999) "Transgenic Milk As A Method For The Production Of Recombinant Antibodies", J. Immunol Methods 231: 147-157). Suitable methods for preparing antibody derivatives are known in the art, eg, humanized, single chain, etc. In another alternative, antibodies can be made recombinantly by phage display technology (see, for example, US Pat.<sup>M</sup> 5,565,332; 5,580,717; 5,733,743; 6,265,150; and Winter, G. et al. (1994) "Making Antibodies By Phage Display Technology, Annu. Rev. Immunol. 12,433-455).
Antibodies or protein of interest can be sequenced by Edman degradation, which is well known to those of skill in the art. Peptide information generated from mass spectrometry or Edman degradation can be used to design probes or primers that are used to clone the protein of interest.
An alternative method of cloning the protein of interest is by "screening" using purified B7-H3 or parts thereof for cells expressing the antibody or protein of interest. B7-H3 exists in a "2Ig" form and as a "4Ig" form. The amino acid sequence of the "2Ig" form of human B7-H3 is (SEQ ID NO: 1):
IMPIOS • «Trruro mbucano
O »THE RWR1DAD C¿s3 nmusTMAl
MLRRRGSPGM GVHVGAALGA LWFCLTGALE VQVPEDPWA LVGTDATLCC SFSPEPGFSL AQLNLIWQLT DTKQLVHSFA EGQDQGSAYA NRTALFPDLL AQGNASLRLQ RVRVADEGSF TCFVSIRDFG SAAVSLQVAA PYSKPSMTLE PNKDLRPGDT VTITCSSYRG YPEAEVFWQD GQGVPLTGNV TTSQMANEQG LFDVHSVLRV VLGANGTYSC LVRNPVLQQD AHGSVTITGQ PMTFPPEALW VTVGLSVCLIALLVALAFVC WRKIKQSCEE ENAGAEDQDG EGEGSKTALQ PLKHSDSKED DGQEIA
<td></td><td colspan="4">The cDNA sequence encoding the "2Ig" form of B7-H3 1 ID NO: 2):</td><td>Romanian is (SEQ</td>
<td> 10</td><td>atgctgcgtc cctgggagca</td><td>ggcggggcag</td><td>ccctggcatg</td><td>ggtgtgcatg</td><td>tgggtgcagc</td>
<td></td><td>ctgtggttct agtggtggca</td><td>gcctcacagg</td><td>agccctggag</td><td>gtccaggtcc</td><td>ctgaagaccc</td>
<td> 15</td><td>ctggtgggca cttcagcctg</td><td>ccgatgccac</td><td>cctgtgctgc</td><td>tccttctccc</td><td>ctgagcctgg</td>
<td></td><td>gcacagctca cagctttgct</td><td>acctcatctg</td><td>gcagctgaca</td><td>gataccaaac</td><td>agctggtgca</td>
<td></td><td>gagggccagg ggacctgctg</td><td>accagggcag</td><td>cgcctatgcc</td><td>aaccgcacgg</td><td>ccctcttccc</td>
<td> 20</td><td>gcacagggca gggcagcttc</td><td>acgcatccct</td><td>gaggctgcag</td><td>cgcgtgcgtg</td><td>tggcggacga</td>
<td></td><td>acctgcttcg ggtggccgct</td><td>tgagcatccg</td><td>ggatttcggc</td><td>agcgctgccg</td><td>tcagcctgca</td>
<td> 25</td><td>ccctactcga aggggacacg</td><td>agcccagcat</td><td>gaccctggag</td><td>cccaacaagg</td><td>acctgcggcc</td>
<td></td><td>gtgaccatca ctggcaggat</td><td>cgtgctccag</td><td>ctaccggggc</td><td>taccctgagg</td><td>ctgaggtgtt</td>
<td></td><td>gggcagggtg cgagcagggc</td><td>tgcccctgac</td><td>tggcaacgtg</td><td>accacgtcgc</td><td>agatggccaa</td>
<td> 30</td><td>ttgtttgatg ctacagctgc</td><td>tgcacagcgt</td><td>cctgcgggtg</td><td>gtgctgggtg</td><td>cgaatggcac</td>
<td></td><td>ctggtgcgca cacagggcag</td><td>accccgtgct</td><td>gcagcaggat</td><td>gcgcacggct</td><td>ctgtcaccat</td>
<td> 35</td><td>cctatgacat ctgtctcatt</td><td>tccccccaga</td><td>ggccctgtgg</td><td>gtgaccgtgg</td><td>ggctgtctgt</td>
<td></td><td>gcactgctgg ctgtgaggag</td><td>tggccctggc</td><td>tttcgtgtgc</td><td>tggagaaaga</td><td>tcaaacagag</td>
<td></td><td>gagaatgcag agccctgcag</td><td>gagctgagga</td><td>ccaggatggg</td><td>gagggagaag</td><td>gctccaagac</td>
<td> 40</td><td>cctctgaaac</td><td colspan="4">actctgacag caaagaagat gatggacaag aaatagcc</td>
WICKED
KSTmrrO MtXICANO J of la nomoAD INDUSTRIAL
The amino acid sequence of the "2Ig" form of human B7-H3 (SEQ ID NO: 1) (shown in bold and underlined below) is fully encompassed within the "4Ig" form of human B7-H3 (SEQ ID NO: 76):
MLRRRGSPGM GVHVGAALGA LWFCLTGALE VQVPEDPWA
LVGTDATLCC SFSPEPGFSL AQLNLIWQLT DTKQLVHSFA EGQDQGSAYA
NRTALFPDLL
AQGNASLRLQ RVRVADEGSF TCFVSIRDFG SAAVSLQVAA PYSKPSMTLE
PNKDLRPGDT VTITCSSYQG YPEAEVFWQD GQGVPLTGNV TTSQMANEQG
LFDVHSILRV VLGANGTYSC LVRNPVLQQD AHSSVTITPQ RSPTGAVEVO
VPEDPWALV GTDATLRCSF SPEPGFSLAQ LNLIWQLTDT KQLVHSFTEG
RDOGSAYANR TALFPDLLAO GNASLRLORV RVADEGSFTC FVSIRDFGSA
AVSLOVAAPY SKPSMTLEPN KDLRPGDTVT ITCSSYRGYP EAEVFWODGO
GVPLTGNVTT SOMANEOGLF DVHSVLRVVL GANGTYSCLV
RNPVLOODAH
GSVTITGOPM TFPPEALWVT VGLSVCLIAL LVALAFVCWR KIKOSCEEEN
AGAEDODGEG EGSKTALOPL KHSDSKEDDG PEIA
The cDNA sequence encoding the "4Ig" form of human B7-H3 is (SEQ ID NO: 77); residues encoding the "2Ig" form of B7-H3 are shown in bold and underlined:
atgctgcgtc ggcggggcag ccctggcatg ggtgtgcatg tgggtgcagc
<td colspan="5">cctgggagca</td>
<td>ctgtggttct</td><td>gcctcacagg</td><td>agccctgqag</td><td>gtccagqtcc</td><td>ctgaagaccc</td>
<td>agtggtggca</td><td></td><td></td><td></td><td></td>
<td>ctggtgggca cttcagcctg</td><td>ccgatgccac</td><td>cctgtgctgc</td><td>tccttctccc</td><td>ctgagcctgg</td>
<td>gcacagctca cagctttgct</td><td>acctcatctg</td><td>gcagctgaca</td><td>gataccaaac</td><td>agctggtgca</td>
<td>gagggccagg ggacctgctg</td><td>accagggcag</td><td>cgcctatgcc</td><td>aaccgcacgg</td><td>ccctcttccc</td>
<td>gcacagggca gggcagcttc</td><td>acgcatccct</td><td>gaggctgcag</td><td>cgcgtgcgtg</td><td>tggcggacga</td>
<td>acctgcttcg ggtggccgct</td><td>tgagcatccg</td><td>ggatttcggc</td><td>agcgctgccg</td><td>tcagcctgca</td>
<td>ccctactcga aggggacacg</td><td>agcccagcat</td><td>gaccctggag</td><td>cccaacaagg</td><td>acctgcggcc</td>
<td>gtgaccatca ctggcaggat</td><td>cgtgctccag</td><td>ctaccagggc</td><td>taccctgagg</td><td>ctgaggtgtt</td>
<td>gggcagggtg cgagcagggc</td><td>tgcccctgac</td><td>tggcaacgtg</td><td>accacgtcgc</td><td>agatggccaa</td>
IMPI Mexican institute DI LA FKONIDAD industrial
<img file="MX345232B_D0032.tif" />
ttgtttgatg ctacagctgc ctggtgcgca cacaccccag agaagcccca ggccctagtg tgcacagcat accccgtgct caggagccgt cctgcgggtg qtqctqqqtq caaatggcac gcagcaggat gcgcacagct ctgtcaccat qgaggtccag gtccctgagg acccggtggt ggcaccgatg ccaccctgcg ctgatccttc tcccccgagc ctggcttcag cctggcacag ctcaacctca tctggcagct gacagacacc aaacagctgg tgcacagttt caccgaaggc cgggaccagg gcagcgccta tgcoaaccgc acggccctct tcceggacct gctggcacaa ggcaatgcat ccctgaggct gcagcgcgtg cgtgtggcgg acgagggcag cttcacctgc ttcgtgagca tccgggattt cggcagcgct gccgtcagcc tgcaggtggc cgctccctac tcgaagccca gcatgaacat ggagcccaac aaggacctgc ggceagggga cacggtgacc atcacgtgct ccagctaecg gggctaccct gaggctgagg tgttctggca ggatgggcag ggtgtgcacc tgactggcaa cgtgaccacg tcgcagatgg ccaacgagca gggcttgttt gatgtgcaca gcgtcctgcg ggtggtgctg ggtgcgaatg gcacctacag ctgcctggtg cgcaaccccg tgctgcagca ggatgcgcac ggctctgtca ccatcacagg gcagcctatg acattaccac cagaggccct gtgggtgacc gtggggctgt ctgtctgtct cattgcactg ctggtggccc tggctttcgt gtgctggaga aagatcaaac agagctgtga ggaggagaat gcaggagctg aggaccagga tggggaggga gaaggctcca agacagccct gcagcctatg aaacactct ^ aca2caaa <3a a2at2atCQa caagaaatag cc
The "screening" procedure can be performed by obtaining a cDNA library from tissues or cells expressing B7-H3, overexpressing the cDNAs in a second cell type, and screening transfected cells of the second cell type for a specific binding. to B7-H3. Detailed descriptions of the methods used in cloning mammalian genes encoding cell surface proteins by "screening" can be found in the art (see, for example, Aruffo, A. et al. (1987) "Molecular Cloning Of A CD28 cDNA By A High-Efficiency COS Cell Expression System ", Proc. Nati. Acad. Sci. (USA) 84: 8573-8577 and Stephan, J. et al. (1999) "Selective Cloning Of Cell Susface Proteins Involved In Organ Development: Epithelial Glycoprotein Is Involved In Normal Epithelial Differentiation", Endocrinol. 140: 5841-5854).
IMPI Mexican institute <sup>of</sup>lafjowbo <d INDUSTRIAL
CDNAs encoding anti-B7-H3 antibodies, and other Β7-Η3 agonists, antagonists, and peptide modulators can be obtained by reverse transcription of mRNAs from a particular cell type according to methods standard in the art. Specifically, mRNA can be isolated using various lytic enzymes or chemical solutions according to the procedures set forth in Sambrook et al. cited above or extracted using commercially available nucleic acid binding resins following the accompanying instructions provided by the manufacturers (eg, Qiagen, Invitrogen, Promega). The synthesized cDNAs are then introduced into an expression vector to produce the antibody or protein of interest in cells of a second type. It is implicit that an expression vector must be replicable in host cells either as episomes or as an integral part of chromosomal DNA. Suitable expression vectors include, but are not limited to, plasmids, viral vectors, including adenoviruses, adeno-associated viruses, retroviruses, and cosmids.
<img file="MX345232B_D0033.tif" />
Vectors containing the polynucleotides of interest can be introduced into the host cell by any of several appropriate methods, including electroporation, transfection employing calcium chloride, rubidium chloride, calcium phosphate, DEAE-dextran, or other substances; microprojectile bombardment; lipofection and infection (for example, when the vector is an infectious agent such as a vaccinia virus). The choice of introduction polynucleotides or vectors will often depend on the characteristics of the host cell.
Any host cell that can overexpress heterologous DNA can be used for the purpose of isolating the genes encoding the antibody, polypeptide, or protein of interest. Non-limiting examples of suitable mammalian host cells include, but are not limited to, COS, HeLa, and CHO cells. Preferably, the host cells express the cDNAs at a level about 5 times higher, more preferably 10 times higher, even more preferably 20 times higher than that of the corresponding endogenous antibody or protein of interest, if present, in the host cells. Selection of host cells for specific binding to B7-H3 is done by immunoassay or FACS. A cell can be identified that overexpresses the antibody or protein of interest.
Various techniques are also available that can now be employed to produce mimic B7-H3 peptide agonists, antagonists, and modulators, encoding additions, deletions, or changes in the amino acid sequence of the resulting protein relative to the agonist, antagonist, or modulator molecule. peptide of parent B7-H3.
IMPI
INSTITUTO MMICANO DI LA FK FIIDAD INDUSTRIAL
The invention includes polypeptides that comprise an amino acid sequence of the antibodies of this invention. The polypeptides of this invention can be prepared by procedures known in the art. Polypeptides can be produced by proteolytic or other degradation of the antibodies, by recombinant methods (ie, individual or fusion polypeptides) as described above, or by chemical synthesis. Conveniently, polypeptides of the antibodies, especially shorter polypeptides of up to about 50 amino acids, are prepared by chemical synthesis. Chemical synthesis methods are known in the art and are commercially available. For example, an anti-B7-H3 polypeptide can be produced by an automated polypeptide synthesizer 10 employing the solid phase method.
IV. Methods for selecting polypeptides and monoclonal antibodies
Various methods can be used to screen for polypeptides and monoclonal antibodies that bind to B7-H3. "Binding" is understood to refer to specific biologically or immunologically relevant binding, and does not refer to non-specific binding that can occur, for example, when an immunoglobulin is used at a very high concentration against a non-specific target. In one embodiment, monoclonal antibodies are selected for binding to B7-H3 using standard selection techniques. In this way, an anti-B7-H3 monoclonal antibody was obtained. The preferred hybridomas of the present invention are those that produce the BRCA69D, BRCA84D or PRCA157 antibodies.
Additional monoclonal antibodies that bind to B7-H3 can be identified. For this purpose, monoclonal antibodies are selected for their differential ability to bind cancer tissues but not non-cancer cells. In one embodiment, monoclonal antibodies are selected that bind to B7-H3 and are also cross-reactive against human cancer cells or tissues, but not against normal cells or tissues to the same degree. One method that can be employed for selection is immunohistochemistry (IHC). Standard immunohistochemical techniques are known to those of ordinary skill in the art. See, for example, Animal Cell Culture Methods (JP Mather and D. Barnes, eds., Academic Press, NY, Vol. 57, chap. 18 and 19, pp. 314-350, 1998). Biological samples (eg, tissues) can be obtained from biopsies, autopsies, or necropsies. To determine if B7-H3 is only present in cancer cells, anti-B7-H3 antibodies can be used to detect the presence of B7-H3 in tissues of individuals with cancer while using other non-cancerous tissues of the individual as controls.
<img file="MX345232B_D0034.tif" />
<img file="MX345232B_D0035.tif" />
IMPI
MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY suffering from cancer or tissues from individuals without cancer. The tissue can be embedded in a solid or semi-solid substance that prevents damage during freezing (eg agarose gel or OCT) and then cut into sections for staining. Cancers of different organs and to different degrees can be used to select for monoclonal antibodies. Examples of tissues that can be used for screening purposes include, but are not limited to, ovary, breast, lung, prostate, colon, kidney, skin, thyroid, brain, heart, liver, stomach, nerve, blood vessels, bone, upper digestive tract and pancreas. Examples of different types of cancer that can be used for screening purposes include, but are not limited to, carcinomas, adenocarcinomas, sarcomas, adenosarcomas, lymphomas, and leukemias.
In still another alternative, cancer cell lines such as HMEC (BioWhittaker CC-2251), HUVEC (primary endothelial cells), BT-474 (ATCC # HTB-20), MCF7 (ATCC # HTB22), can be used. MDA-MB-175-VH (ATCC # HB-25), MDA-MB-361 (ATCC # HB-27), SKBR3 (ATCC # HTB-30), A549 (ATCC # CCL - 185), Calu-3 (ATCC # HTB-55), SKMES-I (ATCC # HTB-58), ES-2 (ATCC # CRL-1978), SKOV3 (ATCC # HTB - 77), Panc1 (ATCC # CRL-1469), AsPC-I (ATCC # CRL-1682), HPAF-II (ATCC # CRL-1997), Hs700T (ATCC No. HTB-174), Colo205 (ATCC No. CCL-222), HT-29 (ATCC No. ΗΓΒ-38), SW480 (ATCC No. CCL-228), SW948 (ATCC No. CCL-237), 293 (ATCC No. CRL-1573), 786-0 (ATCC No. CRL-1932), A498 (ATCC No. HTB-44), Caki-2 (ATCC No. HTB -47), COS-7 (ATCC No. CRL-1651), RL-65 (ATCC No. CRL-10345), SV-T2 (ATCC No. CCL-163.1), 22RV1 (ATCC No.<sup>0</sup> CRL-2505), DU145 (ATCC # HTB-81), LNCaP (ATCC # CRL-1740), PC-3 (ATCC # CRL-1435), HT29 (ATCC # HTB-38) , Hs746T (ATCC η.<sup>0</sup> HTB-135), NCI-N87 (ATCC # CRL-5822), and normal cells from their respective tissues to select for monoclonal antibodies that are specific for cancer tissue. Primary, or low-pass cell cultures derived from normal tissues of different organs, including, but not limited to, kidney, ovary, breast, lung, prostate, colon, kidney, skin, thyroid, aortic smooth muscle, and cells can be used. endothelial cells as negative controls. Cancer or non-cancer cells can be grown on glass coverslips or slides, or on plastic surfaces, or prepared in a CellArray ™ device, as described in WO 01/43869, and selected for antibody binding using IHC as described above for tissues. Alternatively, cells can be removed from the growth surface using non-proteolytic media and centrifuged to obtain a pellet, which is then embedded and treated as tissues for IHC analysis as described above. Cells can be incubated
IMPI ^ iwrm / το mbxicano
O € LA RAOneOAD r * - * «NDUmuAL in immunocompromised animals, allow a tumor to grow, and then this tumor can be harvested, embedded, and used as a tissue source for IHC analysis. In another alternative, individual cells can be selected by incubating with the primary antibody, a secondary "reporter" antibody bound to a fluorescent molecule, and then analyzed using a fluorescence activated cell sorting machine (FACS).
Any of a number of different detection systems can be used to detect binding of antibodies to tissue section. Typically, immunohistochemistry involves the binding of a primary antibody to tissue and then a secondary antibody reactive to the primary antibody species was generated and conjugated to a detectable marker (eg, horseradish peroxidase, HRP, or diaminobencedine, DAB). . An alternative method that can be used is polyMICA ™ polyclonal Mirror Image Complementary Antibodies; The Binding Site Limited, Birmingham, UK; Mangham, DC et al. (1999) "A Novel Immunohistochemical Detection System Using Mirror Image Complementary Antibodies (MICA) ", Histopathology 35 (2): 129-33). The PolyMICA ™ technique can be used to test the binding of primary antibodies (eg, anti-B7-H3 antibodies) to normal and cancerous tissue. There are several kinds of polyMICA ™ detection kit commercially available: product # HK004.D is a polyMICA ™ detection kit using DAB chromogen; Product # HK004.A is a polyMICA ™ detection kit using AEC chromogen. Alternatively, the primary antibody can be directly labeled with the detectable marker.
The first step in the IHC screening to select an appropriate antibody is the binding of primary antibodies prepared in mice (eg, anti-B7-H3 antibodies) to one or more immunogens (eg, cells or tissue samples). In one embodiment, the tissue sample is frozen tissue sections from different organs. Cells or tissue samples can be either cancerous or non-cancerous.
Frozen tissues can be prepared, cut into sections, with or without fixation, and IHC performed by any of several methods known to one of ordinary skill in the art (see, for example, Stephan et al. (1999) "Distribution And Function Of The Adhesion Molecule BEN During Rat Development ", Dev. Biol. 212: 264-277 and Stephan et al. (1999) "Selective Cloning Of Cell Surface Proteins Involved In Organ Development: Epithelial Glycoprotein Is Involved In Normal EpithelialDifferentiation", Endocrinology 140: 5841-5854).
<img file="MX345232B_D0036.tif" />
IMPI
Mexican USTmrro
BE THE INDUSTRIAL HBM1TY
V. Methods of characterization of anti-B7-H3 antibodies
Any of a number of methods can be used to characterize anti-B7-H3 antibodies. One method is to identify the epitope to which it binds. Epitope mapping is commercially available from various sources, eg, Pepscan Systems (Lelystad, The Netherlands). Epitope mapping can be used to determine the sequence to which an anti-B7-H3 antibody binds. The epitope can be a linear epitope, that is, contained in a single stretch of amino acids, or a conformational epitope formed by a three-dimensional interaction of amino acids that may not necessarily be contained in a single stretch.
Peptides of various lengths (eg, preferably at least 4-6 amino acids in length) can be isolated or synthesized (eg, recombinantly) and used for anti-B7-H3 antibody binding assays. The epitope to which the anti-B7-H3 antibody binds can be determined by screening using overlapping peptides derived from the extracellular sequence and determining the binding by anti-B7-H3 antibody.
Yet another method that can be used to characterize an anti-B7-H3 antibody is to use 15 competition assays with other antibodies known to bind to the same antigen, i.e., B7-H3, to determine whether anti-B7- H3 bind to the same epitope as other antibodies. Examples of commercially available antibodies to B7-H3 may be available and can be identified using the binding assays taught herein. Competition testing is well known to those skilled in the art, and such illustrative procedures and data are further detailed in the examples. Anti-B7-H3 antibodies can be further characterized by the tissues, cancer type or tumor type to which they bind. ·
Another method of characterizing anti-B7-H3 antibodies is by the antigen to which they bind. Anti-B7-H3 antibodies were used in Western blots with cell lysates from various human cancers. As is known to one of ordinary skill in the art, Western blotting may involve running cell lysates and / or cell fractions on a denaturing or non-denaturing gel, transferring the proteins to nitrocellulose paper, and then probing the blot with an antibody. (e.g. anti-B7H3 antibody) to see which proteins the antibody binds to. B7-H3 is associated with various human cancers of different tissues including, but not limited to, colon, breast, ovary, pancreas, and lung.
<img file="MX345232B_D0037.tif" />
IMPI
INSTITUTO MBCICANO t »LA FRORUIDAD INDUSTRIAL
SAW. Cancer diagnostic methods using anti-B7-H3 antibodies and B7-H3 modulators
Monoclonal antibodies to B7-H3 prepared by the methods disclosed herein can be used to identify the presence or absence of cancer cells in a variety of tissues, including, but not limited to, ovary, breast, lung, prostate, etc. colon, kidney, pancreas, skin, thyroid, brain, heart, liver, stomach, nerve, blood vessels, bone, and upper gastrointestinal tract, for diagnostic purposes. Monoclonal antibodies to B7-H3 prepared by the methods disclosed herein can also be used to identify the presence or absence of cancer cells, or the level thereof, that are circulating in the blood upon release from a tumor. solid. Such circulating antigen can be an intact B7-H3 antigen, or a fragment thereof that retains the ability to be detected according to the methods taught herein. Such detection can be accomplished by FACS analysis using standard methods commonly used in the art.
These uses may involve the formation of a complex between B7-H3 and an antibody that specifically binds to B7-H3. Examples of such antibodies include, but are not limited to, anti-B7-H3 monoclonal antibodies produced by hybridomas BRCA84D, BRCA69D, and PRCA 157. Formation of such a complex can be performed in vitro or in vivo. Without being bound by theory, the anti-B7-H3 monoclonal antibody can bind to B7-H3 through the extracellular domain of B7-H3 and can then be internalized.
In a preferred embodiment of the diagnostic methods of this invention, the antibody carries a detectable marker. Examples of labels that can be used include a radioactive agent or a fluorophore, such as phycoerythrin or fluorescein isothiocyanate (also known as fluoroisothiocyanate or FITC).
As with other known commercially used antibodies for diagnostic and therapeutic purposes, the target antigen of this invention is widely expressed in normal tissue. It is also upregulated in some tumors. Thus, the particular dosages and routes of administration of the antibodies of this invention as used for diagnostic or therapeutic agents will be tailored to the particular tumor or disease state in question, as well as the particular individual being treated.
<img file="MX345232B_D0038.tif" />
IMPI
[WTrrrUTO MIXÍCANO
INDUSTRIAL
One method of using the antibodies for diagnosis is in vivo tumor imaging by binding the antibody to a radioactive or radiopaque agent, administering the antibody to the individual, and using an x-ray or other imaging machine to visualize the location of the labeled antibody on the surface of cancer cells expressing the antigen. The antibody is administered at a concentration that promotes binding under physiological conditions.
In vitro techniques for the detection of B7-H3 are routine in the art and include enzyme-linked immunosorbent assays (ELISA), immunoprecipitations, immunofluorescence, enzyme immunoassay (EIA), radioimmunoassay (RIA), and Western blot analysis. .
In aspects of this invention, methods of radiation imaging of tumors or neoplasms, or of measuring the efficacy of a method of treatment with a radiolabeled antibody, comprise the step of administering a radiolabeled, tumor-specific antibody to an individual. following the practice of this invention. Radiolabeled antibody 15 can be a monoclonal or polyclonal antibody comprising a radiolabel, preferably selected from the group consisting of technetium 99m, indium 111, iodine 131, rhenium 186, rhenium 188, samarium 153, lutetium 177, copper 64, scandium 47, yttrium 90. Especially preferred are monoclonal antibodies labeled with therapeutic radionuclides such as iodine 131, rhenium 188, holmium 166, samarium 153 and scandium 47, which do not compromise the immunoreactivity of antibodies and do not decompose in vivo. One of ordinary skill in the art will appreciate that other radioactive isotopes are known, and may be suitable for specific applications. Radiation imaging can be performed using single photon emission computed tomography (SPECT), positional emission tomography (PET), computerized axial tomography (CT), or magnetic resonance imaging (NMR). Obtaining correlative images is also contemplated, which allows a greater anatomical definition of the location of localized metastases by radioimmune imaging.
In other methods, cancer cells are removed and tissue is prepared for immunohistochemistry by methods well known in the art (eg, embedding in a freezing compound, freezing and sectioning, with or without fixation; fixation and embedding in paraffin with or without various antigen retrieval and counterstaining methods).
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Monoclonal antibodies can also be used to identify cancer cells at different stages of development. Antibodies can also be used to determine the tumors of which individuals express the antigen on their surface at a predetermined level and are therefore candidates for immunotherapy using antibodies directed against said antigen. Antibodies can recognize both primary and metastatic cancers that express B7-H3. As used herein, detection can include qualitative and / or quantitative detection and can include comparing the measured level to a normal cell to determine an increased level of B7-H3 expression in cancer cells.
The invention also provides methods to aid in the diagnosis of cancer characterized by B7-H3 expressing cancer cells in an individual using any antibody that binds to B7-H3 and any other method that can be used to determine the level of expression of B7- H3. As used herein, "diagnostic aid" methods means that those methods assist in making a clinical determination regarding the classification, or nature, of the cancer, and may or may not be conclusive regarding the definitive diagnosis. Accordingly, a method of aid in cancer diagnosis may comprise the step of detecting the level of B7-H3 in a biological sample of the individual and / or determining the level of expression of B7-H3 in the sample. Antibodies that recognize the antigen or a portion thereof can also be used to create diagnostic immunoassays to detect antigen released or secreted from living or dying cancer cells in body fluids, including, but not limited to, blood, saliva, urine, lung fluid, or ascitic fluid.
Not all cells in a particular tumor of interest will express B7-H3, and cancer cells in other tissues can express B7-H3, therefore an individual must be screened for the presence or absence of B7-H3 in cancer cells to determine usefulness. immunotherapy in the individual. Anti-B7-H3 antibodies prepared by the methods disclosed herein can be used to determine whether an individual diagnosed with cancer is considered to be a candidate for immunotherapy using antibodies directed against B7-H3. In one embodiment, a biopsy sample or a cancerous tumor can be tested for B7-H3 expression, using antibodies directed against B7H3. Individuals with cancer cells expressing B7-H3 are suitable candidates for immunotherapy using antibodies directed against B7-H3. Anti-B7-H3 antibody staining can also be used to distinguish cancerous tissues from normal tissues.
IMPI ΐΝίπτυ-το Mexican »e THE PROPERTY
Methods of using anti-B7-H3 antibodies for diagnostic purposes are useful both before and after any form of anticancer treatment, for example chemotherapy or radiation therapy, to determine which tumors are most likely to respond to a given treatment. , prognosis for an individual with cancer, tumor subtype or origin of metastatic disease, and disease progression or response to treatment.
The compositions of this invention are also suitable for the diagnosis of disease states other than cancer, using the methods generally described above in application with other diseased (non-cancerous) cells. Suitable disease states for use in the methods of this invention include, but are not limited to, diseases or disorders associated with inflammatory or autoimmune responses in individuals. The methods described above can be used to modulate inflammatory or autoimmune responses in individuals. Diseases and conditions resulting from inflammation and autoimmune disorders that can be diagnosed and / or treated using the compositions and methods of the invention include, by way of illustration and not limitation, multiple sclerosis, meningitis, encephalitis, stroke. , other brain injuries, inflammatory bowel disease including ulcerative colitis and Crohn's disease, myasthemia gravis, lupus, rheumatoid arthritis, asthma, Acute juvenile-onset diabetes, AIDS dementia, atherosclerosis, nephritis, retinitis, atopic dermatitis, psoriasis, myocardial ischemia, and acute leukocyte-mediated lung injury.
Still other indications for diagnostic and / or therapeutic use of antibodies and other therapeutic agents of the invention include administration to individuals at risk of organ or graft rejection. Over the last few years there has been a considerable improvement in the efficacy of surgical techniques for transplantation of tissues and organs such as skin, kidney, liver, heart, lung, pancreas and bone marrow. Perhaps the main prominent problem is the lack of satisfactory agents to induce immunotolerance in the recipient to the transplanted organ or allograft. When allogeneic cells or organs are transplanted into a host (i.e., the donor and recipient are different individuals of the same species), the host's immune system is likely to mount an immune response to foreign antigens in the transplant (disease of host versus graft) leading to destruction of transplanted tissue.
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The uses described elsewhere in this application for anti-B7-H3 antibodies also encompass the use of other B7-H3 agonists, antagonists, and modulators as described herein. In such embodiments, the B7H3 antibody is substituted for the agonist, antagonist, or other modulator other than the B7-H3 antibody in the steps described, and alterations are made within the scope of one of ordinary skill to tailor the method to the modulator composition of B7-H3 replaced.
Monoclonal antibodies to B7-H3 prepared by the methods disclosed herein can be used to identify the presence or absence of human cancer stem cells in a variety of tissues. Cancer stem cells (CSCs) have been hypothesized to play a role in tumor growth and metastasis (Ghotra, VP et al. (2009) "The Cancer Stem Cell Microenvironment And Anti-Cancer Therapy", Int. J Radiat Biol. 85 (ll): 955-962; Gupta, PB et al. (2009) "Cancer Stem Cells: Mirage Or Reality?" Nat. Med. 15 (9): 1010-1012; Lawson, JC et al. (2009) "Cancer Stem Cells In Breast Cancer And Metastasis", Breast Cancer Res. Treat. 118 (2): 241-254; Hermann, PC et al. (2009) "Pancreatic Cancer Stem Cells-Insights And Perspectives", Expert Opin. Biol. Ther. 9 (10): 1271-1278; Schatton, T. et al. (2009) "Identification And Targeting Of Cancer Stem Cells", Bioessays 31 (10): 1038-1049; Mittal, S. et al. (2009) "Cancer Stem Cells: The Other Face Of Janus", Amer. J. Med. Sci. 338 (2): 107-112; Alison, MR et al. (2009) "Stem Cells And Lung Cancer: Future Therapeutic Targets?" Expert Opin. Biol. Ther. 9 (9): 1127-1141; Charafe-Jauffret, E. et al. (2009) "Breast Cancer Stem Cells: Tools And Models To Rely On", BMC Cancer 9: 202; Scopelliti, A. et al. (2009) "Therapeutic Implications Of Cancer Initiating Cells", Expert Opin. Biol. Ther. 9 (8): 1005-1016; PCT publication WO 2008/091908). With this hypothesis, CSCs provide a small, differentiated subset of cells within each tumor that can indefinitely self-renew and develop into more adult tumor cells whose replication capacity is relatively limited. It has been hypothesized that these cancer stem cells may be more resistant to chemotherapeutic agents, radiation, or other toxic conditions, and therefore persist after clinical therapies and subsequently grow to give secondary tumors, metastasize, or be responsible for relapses. It has been suggested that CSCs may arise either from stem cells from "normal" tissues or from progenitor cells from more differentiated tissues.
Human cancer stem cells have a number of distinctive characteristics. Such features are described in PCT publication WO 2008/091908 and are incorporated herein.
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OF THE PROPERTY IrVt. ^ TBr industrial document for reference. Monoclonal antibodies to cell surface targets on cancer stem cells can be used to identify the presence or absence of cancer stem cells in a variety of tissues. Monoclonal antibodies to B7-H3 prepared by the methods disclosed herein can also be used to identify the presence or absence of cancer stem cells, or the level of cancer stem cells in a sample or tissue or in circulation upon release. from a solid tumor. Such circulating antigen can be an intact B7-H3 antigen, or a fragment thereof that retains the ability to be detected according to the methods taught herein. Such detection can be accomplished by FACS analysis using standard methods commonly used in the art. In another embodiment, such detection can be accomplished by immunohistochemical analysis of tissue samples using standard methods commonly used in the art.
These uses may involve the formation of a complex between B7-H3 and an antibody that specifically binds to B7-H3 in cancer stem cells. Examples of such antibodies include, but are not limited to, the anti-B7-H3 monoclonal antibodies produced by hybridomas BRCA84D, BRCA69D, and PRCA 157. Formation of such a complex can be performed in vitro or in vivo.
The uses described in this application that mention its use for anti-B7-H3 antibodies also encompass the use of other B7-H3 agonists, antagonists and modulators as described herein for the use of identifying and treating cells. cancerous mother. In such embodiments, anti-B7-H3 antibodies and other B7-H3 agonists, antagonists, and modulators are used for the identification, diagnosis, or therapeutic treatment of cancer stem cells using similar described methods, and alterations are made within the scope of of the ordinary skill to adapt the method to the identification / diagnosis or treatment of cancer stem cells.
VII. Preferred Compositions of the Present Invention
The present invention encompasses compositions, including pharmaceutical compositions, comprising anti-B7-H3 antibodies, polypeptides derived from anti-B7-H3 antibodies, polynucleotides comprising sequences encoding anti-B7-H3 antibodies, and other agents as described. in the present document. As used herein, the compositions further comprise one or more antibodies, polypeptides, and / or proteins that are
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IMPI • Μϊτίτυτο MEXICANO DE LA PROPERTY INDUSTRIAL bind to B7-H3, agonists, antagonists, modulators of B7-H3, and / or one or more polynucleotides that comprise sequences that code for one or more antibodies, polypeptides and proteins that bind to B7 -H3.
The invention further provides conjugates of any B7-H3 peptide agonist, antagonist, or modulator, and additional chemical structures that support the intended function (s) of the particular B7-H3 agonist, antagonist, or peptide modulator.
These conjugates include B7-H3 peptide agonist, antagonist, or modulator covalently linked to a macromolecule such as any insoluble, solid support matrix used in the diagnostic, selection, or purification procedures discussed herein. Suitable matrix materials include any substance that is chemically inert, has high porosity, and has large numbers of functional groups that can form covalent bonds with peptide ligands. Examples of matrix materials and procedures for the preparation of matrix-ligand conjugates are described in Dean et al. (Eds) Affinity CHROMATOGRAPHY: A Practical Approach, IRL Press (1985); Lowe, "An Introduction to Affinity Chromatography," in Work et al. (eds) Laboratory Techniques in Biochemistry AND Molecular BlOLOGY, Vol. 7, Part II, North-Holland (1979); Porath et al., "Biospecific Affinity Chromatography", in Neurath, H. et al. (eds), The PROTEINS, 3<sup>to</sup> ed., Vol. 1, pp. 95-178 (1975); and Schott, H. Affinity Chromatography, Macel Dekker, Inc. NY (1984).
Also provided herein are B7-H3 peptide agonist, antagonist, or modulator conjugates and any reporter moieties used in the diagnostic procedures discussed herein. The B7-H3 peptide agonist, antagonist, or modulator agents, polypeptides, and proteins of this invention, including anti-B7-H3 antibodies, are further identified and characterized by any (one or more) of the following criteria:
(a) an ability to specifically bind to B7-H3 (and in particular B7-H3 molecules that are expressed on the surfaces of cancer cells, including, but not limited to, kidney, prostate, or lung cancer cells);
(b) an ability to competitively inhibit the preferable binding of a known anti-B7-H3 antibody to B7-H3, including the ability to preferentially bind to the same B7-H3 epitope to which the parent antibody preferably binds;
(c) an ability to bind to a part of B7-H3 that is exposed on the surface of a living cell in vitro or in vivo ·,
INSTITUTO MEXICANO Of LA PROPIEDAD INDUSTRIAL (d) an ability to bind to a part of B7-H3 that is exposed on the surface of living cancer cells that express B7-H3; .............<sup>.</sup> . - (e) an ability to deliver a chemotherapeutic agent to cancer cells (such as kidney, prostate or lung cancer cells) expressing B7-H3 on their surface; and / or (f) an ability to deliver a detectable marker or therapeutic agent into cancer cells (such as, but not limited to, prostate cancer cells) that express B7-H3 on their surface.
A preferred antibody of the invention will show differential IHC staining of tumor tissue relative to normal non-cancerous tissue, and can further be tested in primate (and particularly cynomolgus monkey) models for antibody efficacy. The preferred antibodies of the present invention will additionally display desirable levels of antigen affinity and specificity. The preferred antibodies of the present invention will additionally display desirable levels of immunomodulatory activity and cell internalization.
In some embodiments, the antibody of the invention is an antibody that is produced by the BRCA84D, BRCA69D, or PRCA 157 hybridoma, or progeny thereof. The present invention also encompasses various antibody formulations produced by these deposited hybridomas and equivalent antibodies or polypeptide fragments (e.g., Fab, Fab ', F (ab') 2 Fv, Fe, etc.), chimeric antibodies, single chain fragments (scFv ), mutants thereof, fusion proteins comprising an antibody part, humanized antibodies, and any other modified configuration of any of these antibodies or equivalents comprises an antigen recognition site (B7-H3) with the required specificity. The invention also provides human antibodies that exhibit one or more of the biological characteristics of a member of the anti-B7-H3 family of antibodies. Equivalent antibodies from the anti-B7-H3 family of antibodies (including humanized antibodies and human antibodies), polypeptide fragments, and polypeptides comprising any of those fragments are identified and characterized by any (one or more) of the five criteria described above. . Exemplary humanized and murine variable domain sequences of an anti-B7-H3 antibody are provided in PCT publication WO 2008/066691. Such sequences are provided by way of illustration, not limitation, and various sequences as well as fragments and variants of the provided sequences are encompassed within the scope of this invention.
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BRCA84D, BRCA69D and PRCA 157 are the preferred B7-H3 antibodies of the present invention due to their cleaner normal tissue IHC profiles, stronger normal / tumor HTC differential, moderate to strong binding (BIACORE ™) / IHC), cross-reactivity against B7-H3 from cynomolgus monkeys, and potent activity against universal DART ™ molecules ("UDART ™") relative to the other antibodies. In particularly preferred embodiments, the invention encompasses chimeric and humanized variants of these preferred antibodies, as well as native and chimeric and humanized variants of these preferred antibodies having modified Fe regions as described below. The invention further encompasses DART ™ molecules displaying the epitope-binding regions of such antibodies, particularly in concert with epitope-binding region / regions that bind to the T cell receptor, NKG2D receptor, or an associated antigen. a tumor or a hapten such as fluorescein (eg, fluorescein isothiocyanate (also known as fluoroisothiocyanate or FITC).
In some embodiments, the antibodies, polypeptides, and proteins of the invention that bind to B7-H3 are antibodies, polypeptides, and proteins that competitively inhibit the preferred binding of an anti-B7-H3 antibody specified herein to B7- H3. In some embodiments, the antibodies, polypeptides, and proteins preferably bind to the same epitope on B7-H3 to which the mu-anti-B7-H3 antibody preferably binds.
Accordingly, the invention provides any of the following (or compositions, including pharmaceutical compositions, comprising any of the following): (a) an antibody produced by the host cell with a previously identified registration number or its progeny; (b) a humanized form of such an antibody; (c) an antibody comprising one or more of the heavy chain and / or light chain variable regions of such antibody; (d) a chimeric antibody comprising variable regions homologous or derived from variable regions of a heavy chain and a light chain of such an antibody, and constant regions homologous or derived from constant regions of a heavy chain and a light chain of a human antibody; (e) an antibody comprising one or more of the light chain and / or heavy chain CDRs (at least one, two, three, four, five or six) of such antibody; (f) an antibody comprising a heavy and / or light chain of such an antibody; (g) a human antibody that is equivalent to such an antibody. A humanized form of the antibody may or may not have CDRs identical to those of the original antibody, or antibody produced by a host cell with a registration number identified above. The determination of CDR regions is within
IMPI INSTITUTO MAXICANO M LA MOHRDAO INDUSTRIAL the experience of the technique. In some embodiments, the invention provides an antibody comprising at least one CDR that is substantially homologous to at least one CDR, at least two, at least three, at least four, at least 5 CDRs of an antibody produced by one of the hybridomas. deposited previously identified (or, in some embodiments substantially homologous to the 6 CDRs one of those antibodies, or derived from one of those antibodies), or antibody produced by the host cell with a registration number identified above. Other embodiments include antibodies that have at least two, three, four, five, or six CDRs that are substantially homologous to at least two, three, four, five, or six CDRs of an antibody produced from a deposited hybridoma as identified in herein, or derived from such an antibody. It is understood that, for purposes of this invention, binding specificity and / or overall activity (which may be in terms of delivering a chemotherapeutic agent to or into cancer cells to reduce growth and / or proliferation are generally preserved of cancer cells, to induce apoptotic cell death in the cancer cell, to delay the development of metastasis, and / or to treat palliatively), although the degree of activity can vary compared to an antibody produced by a deposited hybridoma (it can be higher or lower). The invention also provides methods of preparing any of these antibodies. Methods of preparing antibodies are known in the art and are described herein.
The invention also provides polypeptides comprising an amino acid sequence of the antibodies of the invention. In some embodiments, the polypeptide comprises one or more of the light chain and / or heavy chain variable regions of the antibody. In some embodiments, the polypeptide comprises one or more of the antibody's light chain and / or heavy chain CDRs. In some embodiments, the polypeptide comprises three CDRs of the antibody light chain and / or heavy chain. In some embodiments, the polypeptide comprises an amino acid sequence of the antibody that has any of the following: at least 5 contiguous amino acids of a parent antibody sequence, at least 8 contiguous amino acids, at least about 10 contiguous amino acids, at least about 15 contiguous amino acids, at least about 20 contiguous amino acids, at least about 25 contiguous amino acids, at least about 30 contiguous amino acids, wherein at least 3 of the amino acids are from a variable region of the antibody. In one embodiment, the variable region is from a light chain of the parent antibody. In another embodiment, the variable region is from an antibody heavy chain. In another embodiment,
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the 5 (or more) contiguous amino acids are from a complementarity determining region (CDR) of the antibody.
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In some embodiments of this invention, cells of this invention expressing B7-H3, a portion of B7-H3, anti-B7-H3 antibodies, or other B7-H3 binding polypeptides of this invention are administered directly to an individual to modulate in vivo the biological activity of B7-H3.
The preferred anti-B7-H3 antibodies of the present invention are BRCA84D, BRCA69D and PRCA 157, all of these antibodies are murine antibodies reactive against the human B7-H3 molecule. The variable light chain and variable heavy chain encoding polynucleotide and amino acid sequences of BRCA84D, BRCA69D, and PRCA157 are shown below along with the respective CDRi, CDR2, and CDR3 domains of each such chain. Those skilled in the art will therefore be able to construct antibodies having such CDRs, as well as derivatives thereof, that can bind to epitopes recognized by BRCA84D, BRCA69D and PRCA157.
A. BRCA84D sequences (1) BRCA84D light chain sequences
BRCA84D Variable Light Chain Amino Acid Sequence (SEQ ID NO: 3): DIAMTQSQKF MSTSVGDRVS VTCKASQNVD TNVAWYQQKP GQSPKALIYS ASYRYSGVPD RFTGSGSGTD FTLTINNVQS EDLAEYPFCQFTQF YNNY GTLAEYPFCFTQF
Polynucleotide sequence encoding the variable light chain BRCA84D (SEQ ID NO: 4): gacattgcga tgacccagtc tcaaaaattc atgtccacat cagggtcagc cagtaggaga aggccagtca gtcacctgca gaatgtggat actaatgtag acagaaacca cctggtatca gggcaatctc ctaaagcact gatttactcg gcatcctacc ggtacagtgg agtccctgat cgcttcacag gcagtggatc tgggacagat ttcactctca ccatcaacaa tgtgcagtct gaagacttgg cagagtattt ctgtcagcaa tataacaact atccattcac gttcggctcg gggacaaagt tggaaataaa a
CDR | BRCA84D Variable Light Chain (SEQ ID NO: 5): KASQNVDTNVA
Polynucleotide sequence encoding the variable light chain CDRi of
BRCA84D (SEQ ID NO: 6): aaggccagtc agaatgtgga tactaatgta gcc ί
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INSTITUTO MEXICANO M LA RE ÁIDAD ΙΝΟίΛτΕΙΑΙ
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BRCA84D variable light chain CDR2 (SEQ ID NO: 71sasyrys
Polynucleotide sequence encoding variable light chain CDR2 of
BRCA84D (SEQ ID NO: 8): tcggcatcct accggtacag t
CDR<sub>3</sub> BRCA84D variable light chain (SEQ ID NO: 9): QQYNNYPFT
Polynucleotide sequence encoding variable light chain CDRj of
BRCA84D (SEQ *) NO: 10): cagcaatata acaactatcc attcacg (2) BRCA84D heavy chain sequences
Variable heavy chain amino acid sequence of BRCA84D (SEQ ID NO: 11):
DVQLVESGGG LVQPGGSRKL SCAASGFTFS SFGMHWVRQA PEKGLEWVAY
ISSDSSAIYY ADTVKGRFTI SRDNPKNTLF LQMTSLRSED TAMYYCGRGR
ENIYYGSRLD YWGQGTTLTV SS
Polynucleotide sequence encoding BRCA84D variable heavy chain (SEQ ID NO: 12):
gatgtgcagc tggtggagtc tgggggaggc ttagtgcagc ctggagggtc ccggaaactc tcctgtgcag cctctggatt cactttcagt agctttggaa tgcactgggt tcgtcaggct ccagagaagg ggctggagtg ggtcgcatac attagtagtg acagtagtgc catctactat gcagacacag tgaagggccg attcaccatc tccagagaca atcccaagaa caccctgttc ctgcaaatga ccagtctaag gtctgaggac acggccatgt attactgtgg aagagggagg gaaaacattt actacggtag taggcttgac tactgggg cc aaggcaccac tctcacagtc tcctca
BRCA84D variable heavy chain CDRi (SEQ ID NO: 13): FGMH
BRCA84D variable heavy chain CDR] polynucleotide sequence (SEQ ID NO: 14): tttggaatgcac
CDR<sub>2</sub> BRCA84D variable heavy chain (SEQ ID NO: 15):
YISSDSSAIYYADTVK
Polynucleotide sequence encoding CDR<sub>2</sub> BRCA84D variable heavy chain (SEQ ID NO: 16): tacattagta gtgacagtag tgccatctac tatgcagaca cagtgaag
BRCA84D variable heavy chain CDR3 (SEQ ID NO: 17): GRENIYYGSRLDY
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Polynucleotide sequence encoding variable heavy chain CDR3 of
BRCA84D (SEQ ID NO: 18): gggagggaaa acatttacta cggtagtagg cttgactac
B. BRCA69D sequences (1) BRCA69D light chain sequences
Variable light chain amino acid sequence of BRCA69D (SEQ ID NO: 19):
DIQMTQTTSS LSASLGDRVT ISCRASQDIS NYLNWYQQKP DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTIDNLEQ EDIATYFCQQ GNTLPPTFGG GTKLEIK
Polynucleotide sequence encoding BRCA69D variable light chain (SEQ
ID NO: 20):
gatatccaga tgacacagac tacatcctcc ctgtctgcct ctctgggaga cagagtcacc atcagttgca gggcaagtca ggacattagt aattatttaa gcagaaacca actggtatca gatggaactg ttaaactcct gatctactac acatcacgat tacactcagg agtcccatca aggttcagtg gcagtgggtc tggaacagat tattctctca cctggagcaa ccattgacaa 15 gaagatattg ccacttactt ttgccaacag ggtaatacgc ttcctccgac gttcggtgga tggaaatcaa to ggcaccaaac
BRCA69D variable light chain CDRi (SEQ ID NO: 21): RASQDISNYLN
Polynucleotide sequence encoding variable light chain CDRi of
BRCA69D (SEQ ID NO: 22): agggcaagtc aggacattag taattattta aac
CDR<sub>2</sub> BRCA69D Variable Light Chain (SEQ ID NO: 23): YTSRLHS
Polynucleotide sequence encoding CDR<sub>2</sub> variable light chain
BRCA69D (SEQ ID NO: 24): tacacatcac gattacactc a
BRCA69D variable light chain CDRj (SEQ ID NO: 25): QQGNTLPPT
Polynucleotide sequence encoding variable light chain CDR3 of
BRCA69D (SEQ ID NO: 26): caacagggta atacgcttcc tccgacg (2) BRCA69D heavy chain sequences
Variable heavy chain amino acid sequence of BRCA69D (SEQ ID NO: 27):
QVQLQQSGAE LARPGASVKL SCKASGYTFT SYWMQWVKQR PGQGLEWIGT IYPGDGDTRY TQKFKGKATL TADKSSSTAY MQLSSLASED SAVYYCARRG
IPRLWYFDVW GAGTTVTVSS
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Polynucleotide sequence encoding BRCA69D variable heavy chain (SEQ ID NO: 28):
caggttcagc tccagcagtc tggggctgag ctggcaagac ctggggcttc agtgaagttg tcctgcaagg cttctggcta cacctttact agctactgga tgcagtgggt aaaacagagg 5 cctggacagg gtctggaatg gattgggact atttatcctg gagatggtga tactaggtac actcagaagt tcaagggcaa ggccacattg actgcagata aatcctccag cacagcctac atgcaactca gcagcttggc atctgaggac tctgcggtct attactgtgc aagaagaggg attccacggc tttggtactt cgatgtctgg ggcgcaggga ccacggtcac cgtctcctca
BRCA69D variable heavy chain CDR] (SEQ ID NO: 29): SYWMQ
Polynucleotide sequence encoding variable heavy chain CDRi of
BRCA69D (SEQ ID NO: 30): agctactgga tgcag
BRCA69D variable heavy chain CDR2 (SEQ ID NO: 31): TIYPGDGDTR
YTQKFKG
Polynucleotide sequence encoding variable heavy chain CDR2 of
BRCA69D (SEQ ID NO: 32): actatttatc ctggagatgg tgatactagg tacactcag aagttcaagg ge
BRCA69D variable heavy chain CDR3 (SEQ ID NO: 33): RGIPRLWYFD V
Polynucleotide sequence encoding variable heavy chain CDR3 of
BRCA69D (SEQ ID NO: 34): agagggattc cacggctttg gtacttcgat gtc
C. PRCA 157 Sequences (1) PRCA157 Light Chain Sequences
Variable light chain amino acid sequence of PRCA157 (SEQ ID NO: 35): DIQMTQSPAS LSVSVGETVT ITCRASESIY SYLAWYQQKQ GKSPQLLVYN
TKTLPEGVPS RFSGSGSGTQ FSLKINSLQP EDFGRYYCQH HYGTPPWTFG GGTNLEIK
Polynucleotide sequence encoding PRCA 157 variable light chain (SEQ
ID NO: 36):
gacatccaga tgactcagtc tccagcctcc ctatctgtat ctgtgggaga aactgtcacc attacatgtc gagcaagtga gagtatttac agttatttag catggtatca gcagaaacag ggaaaatctc ctcagctcct ggtctataat acaaatcag tccagtcagat ggtccagt
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Variable light chain CDRi of PRCA157 (SEQ ID NO: 37): RASESIYSYLA
Polynucleotide sequence encoding variable light chain CDRi of
PRCA157 (SEQ ID NO: 38): cgagcaagtg agagtattta cagttattta gca
CDR; PRCA157 Variable Light Chain (SEQ ID NO: 39): NTKTLPE
Polynucleotide sequence encoding CDR<sub>2</sub> variable light chain
PRCA157 (SEQ Π) NO: 40): aatacaaaaa ccttaccaga g
CDR<sub>3</sub> variable light chain PRCA 157 (SEQ ID NO: 41): QHHYGTPPW
Polynucleotide sequence encoding CDR<sub>3</sub> variable light chain
PRCA157 (SEQ ID NO: 42): caacatcatt atggtactcc tccgtgg (2) PRCA157 heavy chain sequences
Variable heavy chain amino acid sequence of PRCA157 (SEQ ID NO: 43):
EVQQVESGGD LVKPGGSLKL SCAASGFTFS SYGMSWVRQT PDKRLEWVAT INSGGSNTYY PDSLKGRFTI SRDNAKNTLY LQMRSLKSED TAMYYCARHD GGAMDYWGQG TSVTVSS
Polynucleotide sequence encoding PRCA157 variable heavy chain (SEQ
ID NO: 44):
gaggtgcagc aggtggagtc ggggggagac ttagtgaagc ctggagggtc cctgaaactc tcctgtgcag cctctggatt cactttcagt tcctatggca tgtcttgggt tcgccagact ccagacaaga ggctggagtg ggtcgcaacc attaatagtg gtggaagtaa cacctactat ccagacagtt tgaaggggcg attcaccatc tccagagaca atgccaagaa caccctttac ctgcaaatgc gcagtctgaa gtctgaggac acagccatgt attactgtgc aagacatgac gggggagcta tggactactg gggtcaagga ccgtctcctc to acctcagtca
PRCA157 variable heavy chain CDRi (SEQ ID NO: 45): SYGMS
Polynucleotide sequence encoding variable heavy chain CDRi of
PRCA157 (SEQ ID NO: 46): tcctatggca tgtct
<img file="MX345232B_D0049.tif" />
MUICANO INSTITUTE
Bt INDUSTRIAL PROPERTY
PRCA157 variable heavy chain CDRi (SEQ ID NO: 47): VATINSGGSN
TYYPDSLKG
Polynucleotide sequence encoding PRCA157 variable heavy chain CDR2 (SEQ ID NO: 48): gtcgcaacca ttaatagtgg tggaagtaac acctactatc cagacagttt gaagggg
PRCA157 variable heavy chain CDR3 (SEQ ID NO: 49): HDGGAMDY
Polynucleotide sequence encoding PRCA157 variable heavy chain CDR3 (SEQ ID NO: 50): catgacgggg gagctatgga ctac
D. Antibodies to B7-H3 Engineered from Fe
In traditional immune function, the interaction of antibody-antigen complexes with cells of the immune system results in a wide variety of responses, ranging from effector functions such as antibody-dependent cytotoxicity, mast cell degranulation, and phagocytosis to immunomodulatory signals such as that regulate the proliferation of lymphocytes and the secretion of antibodies. All of these interactions are initiated through the binding of the Fe domain of antibodies or immune complexes to specialized cell surface receptors on hematopoietic cells. The diversity of cellular responses activated by antibodies and immune complexes results from the structural heterogenicity of the three Fe receptors: FcyRI (CD64), FcyRII (CD32) and FcyRIII (CD16). FcyRI (CD64), FcyRIIA (CD32A), and FcyRIII (CD16) are activating receptors (ie, immune system enhancers); FcyRIIB (CD32B) is an inhibitory receptor (that is, a suppressor of the immune system). The amino acid sequence of the Fe region of IgGl is shown below (as SEQ ID NO: 51, numbered according to Kabat et al., Sequence of Proteins of Immunological INTEREST, 5<sup>to</sup> Ed. Public Health Service, NIH, MD (1991), expressly incorporated herein by reference, and hereinafter referred to as "Kabat EU"):
SEQ ID NO: 51
<td>PAPELLGGPS 230</td><td>VFLFPPKPKD 240</td><td>TLMISRTPEV 250</td><td>TCVVVDVSHE 260</td><td>DPEVKFNWYV 270</td>
<td>DGVEVHNAKT</td><td>KPREEQYNST</td><td>YRVVSVLTVL</td><td>HQDWLNGKEY</td><td>KCKVSNKALP</td>
<td> 280</td><td> 290</td><td> 300</td><td> 310</td><td> 320</td>
<td>APIEKTISKA</td><td>KGQPREPQVY</td><td>TLPPSREEMT</td><td>KNQVSLTCLV</td><td>KGFYPSDIAV</td>
<td> 330</td><td> 340</td><td> 350</td><td> 360</td><td> 370</td>
ΐΝίτττυτ · mengano BE LA EROmOAD INDUSTRIAL
EWESNGQPEN NYKTTPPVLD SDGSFFLYSK LTVDKSRWQQ GNVFSCSVMH
380 390 400 410 420
EALHNHYTQK SLSLSPGK
430 440
Residues 230-341 are the CH2 region of Fe. Residues 342-447 are the CH3 region of Fe.
The present invention includes antibodies that specifically bind to B7-H3 that comprise a variant Fe region that has one or more amino acid modifications (eg, substitutions, deletions, insertions) in one or more parts, modifications that increase affinity and avidity. of the variant Fe region for an FcyR (including activating and inhibiting FcyRs). In some embodiments, said one or more amino acid modifications increase the affinity of the variant Fe region for FcyRIIIA and / or FcyRIIA. In another embodiment, the variant Fe region specifically further binds to FcyRIIB with a lower affinity than the Fe region of the comparable parent antibody (i.e., an antibody having the same amino acid sequence as the antibody of the invention except for the one or more amino acid modifications in the Fe region). In some embodiments, such modifications increase the affinity of the variant Fe region for FcyRIIIA and / or FcyRIIA and also enhance the affinity of the variant Fe region for FcyRIIB relative to the parent antibody. In other embodiments, said one or more amino acid modifications increase the affinity of the variant Fe region for FcyRIIIA and / or FcyRIIA but do not alter the affinity of the variant Fe regions for FcyRIIB relative to the original antibody Fe region. In another embodiment, said one or more amino acid modifications enhance the affinity of the variant Fe region for FcyRIIIA and FcyRIIA but reduce the affinity for FcyRIIB relative to the parent antibody. Increased affinity and / or avidity results in detectable FcyR binding or FcyR-related activity in cells expressing low levels of FcyR when no binding activity of the parent molecule (without the modified Fe region) can be detected in the cells. In other embodiments, the modified molecule shows detectable binding in cells expressing target receptor antigens other than FcyR at a density of 30,000 to 20,000 molecules / cell, at a density of 20,000 to 10,000 molecules / cell, at a density of 10,000 to 5,000. molecules / cell, at a density of 5,000 to 1,000 molecules / cell, at a density of 1,000 to 200 molecules / cell, or at a density of 200 molecules / cell or less (but at least 10,50,100 or 150 molecules / cell).
In another embodiment, said one or more amino acid modifications of the Fe region reduce the affinity and avidity of the antibody for one or more Fc and R receptors. In one embodiment
<img file="MX345232B_D0050.tif" />
Specifically, the invention encompasses antibodies that comprise a variant Fe region, wherein said variant Fe region comprises at least one amino acid modification with respect to a wild-type Fe region, variant Fe region that only binds to one Fc and R, in the that said FcyR is FcyRIIIA. In another specific embodiment, the invention encompasses antibodies that comprise a variant Fe region, wherein said variant Fe region comprises at least one amino acid modification with respect to a wild-type Fe region, variant Fe region that only binds to one FcyR , wherein said FcyR is FcyRIIA.
Preferably, the binding properties of the molecules of the invention are characterized by in vitro functional assays to determine one or more FcyR mediating effector cell functions (see section 5.2.7). The affinities and binding properties of molecules, eg, antibodies, of the invention for a FcyR can be determined using in vitro assays (biochemical or immunological-based assays) known in the art to determine antibody-antigen or Fc-FcyR interactions, i.e., specific binding of an antigen to an antibody or specific binding of an Fe region to an Fc and R, respectively, including, but not limited to, ELISA assay, surface plasmon resonance assay, immunoprecipitation assays. In the most preferred embodiments, the molecules of the invention have similar binding properties in in vivo models (such as those described and disclosed herein) to those in in vitro assays. However, the present invention does not exclude molecules of the invention that do not display the desired phenotype in in vitro assays but do display the desired phenotype in vivo.
In some embodiments, molecules of the invention that comprise a variant Fe region comprise at least one amino acid modification (e.g., exhibiting 1, 2, 3,4, 5, 6, 7, 8, 9, or more modifications of amino acids) in the CH3 domain of the Fe region, which is defined as extending from amino acids 342-447. In other embodiments, molecules of the invention that comprise a variant Fe region comprise at least one amino acid modification (e.g., exhibiting 1, 2, 3, 4, 5, 6, 7, 8, 9, or more modifications of amino acids) in the CH2 domain of the Fe region, which is defined as extending from amino acids 231-341. In some embodiments, the molecules of the invention comprise at least two amino acid modifications (eg, exhibiting 2, 3, 4, 5, 6, 7, 8, 9, or more amino acid modifications), wherein at least one such modification is in the CH3 region and at least one such modification is in the CH2 region. The invention further encompasses the
<img file="MX345232B_D0051.tif" />
IMPI
INSTITUTO MEXICANO 1 »THE AVERAGE induitmal modification of amino acids in the hinge region. In a particular embodiment, the invention encompasses amino acid modification in the CH1 domain of the Fe region, which is defined as extending from amino acids 216-230.
In particularly preferred embodiments, the invention encompasses molecules comprising a variant Fe region wherein said variant confers or has increased ADCC activity and / or increased binding to FcyRIIA (CD32A), as measured using methods known to one of skill. in the art and shown by way of example herein. The ADCC assays used according to the methods of the invention can be either NK cell dependent or macrophage dependent.
In particularly preferred embodiments, the invention encompasses molecules comprising a variant Fe region wherein said variant confers or has increased ADCC activity and / or increased binding to FcyRIIIA (CDlóAseg), as measured using methods known to one of ordinary skill in the art. technique and are exemplified herein. The ADCC assays used according to the methods of the invention can be either NK cell dependent or macrophage dependent.
The Fe variants of the present invention can be combined with other Fe modifications, such as those disclosed in US Pat.<sup>you</sup> 7,632,497; 7,521,542; 7,425,619; 7,416,727; 7,371,826; 7,355,008; 7,335,742; 7,332,581; 7,183,387; 7,122,637 and 6,737,056; in PCT publications n.<sup>you</sup> WO 2008/105886; WO 2008/002933; WO 2007/021841;
WO 2007/106707; WO 06/088494; WO 05/115452; WO 05/110474; WO 04/1032269 and WO 04/063351; and in Presta, LG et al. (2002) "Engineering therapeutic antibodies for improved function", Biochem. Soc. Trans. 30 (4): 487-490; Shields, RL et al. (2002) "Lack of fucose on human IgGl N-linked oligosaccharide improves binding to human Fcgamma RIII and antibodydependent cellular toxicity", J. Biol. Chem. 26; 277 (30): 26733-26740 and Shields, RL et al. (2001) "High resolution mapping of the binding site on human IgGl for Fe gamma RI, Fe gamma RH, Fe gamma RUI, and FcRn and design of IgGl variants with improved binding to the Fe gamma R", J. Biol. Chem. 276 (9): 6591-6604). The invention encompasses combining an Fe variant of the invention with other Fe modifications to provide additive, synergistic or novel properties to the modified antibody. Preferably, the Fe variants of the invention enhance the phenotype of the modification with which they are combined. For example, if an Fe variant of the invention is combined with a mimic known to bind FcyRIIIA with an affinity greater than one
<img file="MX345232B_D0052.tif" />
Comparable wild-type Fe region; combination with a mutant of the invention results in a more-fold enhancement of FcyRIIIA affinity.
The invention encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region, wherein the variant Fe region comprises at least one amino acid modification (for example, exhibiting 1, 2, 3, 4, 5, 6 , 7, 8, 9, or more amino acid modifications) with respect to a wild-type Fe region, such that the molecule has an enhanced effector function with respect to a molecule comprising a wild-type Fe region, provided that the variant Fe region does not have or is not only a substitution in any one or more of positions 243, 255, 256, 258, 267, 268, 269, 270, 272, 276, 278,280,
283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 300, 301, 303, 305, 307, 309, 312,320,
322, 326, 329, 330, 332, 331, 333, 334, 335, 337, 338, 339, 340, 359, 360, 373, 376, 416,419,
430, 434, 435, 437, 438, 439. In a specific embodiment, the invention encompasses such antibodies that comprise a variant Fe region, wherein the variant Fe region comprises at least one amino acid modification (for example, exhibiting 1, 2, 3, 4, 5, 6, 7 , 8, 9, or more amino acid modifications) with respect to a wild-type Fe region, such that the molecule binds to an FcyR with altered affinity with respect to a molecule comprising a wild-type Fe region, provided that the variant Fe region does not have or is not only a substitution in any one or more of positions 243, 255, 258, 267, 269, 270, 276, 278, 280, 283, 285, 289, 292, 293, 294, 295, 296, 300, 303, 305, 307, 309, 320, 322, 329, 332, 331, 337, 338, 340, 373, 376, 416, 419, 434, 435, 437, 438, 439 and does not have an alanine at any of positions 256, 290, 298, 312, 326, 333, 334, 359, 360, or 430; an asparagine at position 268; a glutamine at position 272; a glutamine, serine, or aspartic acid at position 286; a serine at position 290; a methionine at position 301; a methionine, glutamine, glutamic acid, or arginine at position 320; a glutamic acid at position 322; an asparagine, serine, glutamic acid, or aspartic acid at position 326; a lysine at position 330; a glutamine at position 334; a glutamic acid at position 334; a methionine at position 334; a histidine at position 334; a valine at position 334; a leucine at position 334; a glutamine at position 335; a lysine at position 335; or a threonine at position 339.
The invention also encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region, wherein the variant Fe region comprises such antibodies that comprise a variant Fe region, wherein the variant Fe region does not have or is not 69
<img file="MX345232B_D0053.tif" />
only a substitution in any one or more of positions 268, 269, 270, 272, 276, 278, 283, 285, 286, 289, 292, 293, 301, 303, 305, 307, 309, 320, '331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 416, 419, 430, 434, 435, 437, 438, or 439 and does not have a histidine, glutamine, or tyrosine at position 280; a serine, glycine, threonine or tyrosine at position 290, an asparagine at position 294, a lysine at position 295; a proline at position 296; a proline, asparagine, aspartic acid, or valine at position 298; or a leucine or isoleucine at position 300. In another embodiment, the invention encompasses such antibodies that comprise a variant Fe region, wherein the variant Fe region comprises at least one amino acid modification relative to a wild-type Fe region, such that the molecule binds to a FcyR with a reduced affinity with respect to the molecule comprising a wild-type Fe region provided that the variant Fe region does not have or is not solely a substitution at any one or more of positions 243, 252, 254, 265, 268, 269, 270, 278, 289, 292, 293, 294, 295, 296, 298, 300, 301, 303, 322, 324, 327, 329, 333, 335, 338, 340, 373, 376, 382, 388, 389, 414, 416, 419, 434, 435, 437, 438, or 439. In yet another embodiment, the invention encompasses such antibodies that comprise a variant Fe region, wherein the variant Fe region comprises at least one amino acid modification relative to a wild-type Fe region, in such a way that the molecule binds to an FcyR with an enhanced affinity with respect to a molecule comprising a wild-type Fe region provided that the variant Fe region does not have or is not solely a substitution in any one or more of the positions 280, 283, 285, 286, 290, 294, 295, 298, 300, 301, 305, 307, 309, 312, 315, 331, 333,334, 337, 340, 360, 378, 398, or 430.
The invention also encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region, wherein the variant Fe region does not include or is not solely a substitution at any one or more of positions 330, 243, 247, 298 , 241, 240, 244, 263, 262, 235, 269, or 328 and does not have a leucine at position 243, an asparagine at position 298, a leucine at position 241, and isoleucine or an alanine at position 240, a histidine at position 244, a valine at position 330 or an isoleucine at position 328.
The invention particularly encompasses antibodies that specifically bind to B7-H3 comprising a variant Fe region with enhanced effector function and / or altered affinities for activating and / or inhibitory receptors, wherein the variant Fe region comprises: (a) 1, 2, 3, 4, 5, or 6 any of the following substitutions: S239D, S298A, A33OL, I332E, E333A, or K334A; or (b) any of the combinations of substitutions: (1) S298A, E333A, and K334A; (2) S239D and I332E; or (3) S239D, A330L and I332E.
<img file="MX345232B_D0054.tif" />
IMPI
MEXICAN INSTITUTE
OF INDUSTRIAL PEOPLE
The invention particularly encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region with enhanced effector function and / or altered affinities for activating and / or inhibitory receptors, wherein the variant Fe region comprises a substitution:
(1) at position 288 with asparagine, at position 330 with serine, and at position 396 with leucine;
(2) at position 334 with glutamic acid, at position 359 with asparagine, and at position 366 with serine;
(3) at position 316 with aspartic acid, at position 378 with valine, and at position 399 with glutamic acid;
(4) at position 247 with leucine, and a substitution at position 421 with lysine;
(5) at position 392 with threonine, and at position 396 with leucine;
(6) at position 221 with glutamic acid, at position 270 with glutamic acid, at position 308 with alanine, at position 311 with histidine, at position 396 with leucine, and at position 402 with aspartic acid;
(7) at position 419 with histidine, and a substitution at position 396 with leucine;
(8) at position 240 with alanine, and at position 396 with leucine;
(9) at position 410 with histidine, and at position 396 with leucine;
(10) at position 243 with leucine, at position 305 with isoleucine, at position 378 with aspartic acid, at position 404 with serine, and at position 396 with leucine;
(11) at position 255 with isoleucine, and at position 396 with leucine;
(12) at position 370 with glutamic acid and at position 396 with leucine;
(13) at position 270 with glutamic acid; or (14) any combination of the substitutions (1) - (12) above.
In a specific embodiment, the invention encompasses an antibody that specifically binds to B7-H3 comprising a variant Fe region comprising the substitution: F243L, R292P and Y300L. In a further specific embodiment, the invention encompasses an antibody that specifically binds to B7-H3 comprising a variant Fe region comprising the substitution: L235V, F243L, R292P, Y300L and P396L. In yet a further specific embodiment, the invention encompasses an antibody that specifically binds to B7-H3 that 71
<img file="MX345232B_D0055.tif" />
IMPI
INSTITUTE MtXJCANO “industrial urepmbAD comprises a variant Fe region comprising the substitution F243L, R292P, Y300L, V305I and P396L.
In a further specific embodiment, the invention encompasses an antibody that specifically binds to B7-H3 comprising a variant Fe region comprising a substitution at position 396 with leucine, at position 270 with glutamic acid and at position 243 with leucine. . In another specific embodiment the molecule further comprises one or more amino acid modifications such as those disclosed herein.
The invention particularly encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region with enhanced effector function and / or altered affinities for activating and / or inhibitory receptors, having an amino acid modification at one or more of the following positions : 119, 125, 132, 133, 141, 142, 147, 149, 162, 166, 185, 192, 202, 205, 210, 214, 215, 216, 217, 218, 219, 221, 222, 223, 224 , 225, 227, 229, 231, 232, 233, 235,
240, 241, 242, 243, 244, 246, 247, 248, 250, 251, 252, 253, 254, 255, 256, 258, 261, 262,263,
268, 269, 270, 272, 274, 275, 276, 279, 280, 281, 282, 284, 287, 288, 289, 290, 291, 292,293,
295, 298, 301, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 315, 316, 317, 318,319,
320, 323, 326, 327, 328, 330, 333, 334, 335, 337, 339, 340, 343, 344, 345, 347, 348, 352,353,
354, 355, 358, 359, 360, 361, 362, 365, 366, 367, 369, 370, 371, 372, 375, 377, 378, 379,380,
381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 392, 393, 394, 395, 396, 397, 398, 399,400,
401, 402, 404, 406, 407, 408, 409, 410, 411, 412, 414, 415, 416, 417, 419, 420, 421, 422,423,
424, 427, 428, 431, 433, 435, 436, 438, 440, 441, 442, 443, 446 or 447. Preferably such mutations result in molecules that have been conferred an effector cell-mediated function and, optionally, they have an altered affinity for an FcyR as determined using methods disclosed and exemplified herein and known to one of ordinary skill in the art.
The invention particularly encompasses antibodies that specifically bind to B7-H3 that comprise a variant Fe region with altered effector function and / or altered affinities for activating and / or inhibitory receptors, having:
(I) an amino acid modification in one or more of the following positions: 235, 240, 241, 243, 244, 247, 262,263, 269,298, 328 or 330 and more preferably one or more of the following modifications: V240A, V240I, F241L, F243L, P244H, S298N, L328I,
<img file="MX345232B_D0056.tif" />
IMPI
MEXICAN KSTTTUTO
OF INDUSTRIAL PRORILLITY
A33OV; wherein such antibodies show altered effector function relative to antibodies having a wild-type Fe region lacking such modification;
(II) an amino acid modification at one or more of the following positions: 268, 269, 270, 272, 276, 278, 283, 285, 286, 289, 292, 293, 301, 303, 305, 307, 309, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 416, 419, 430, 434, 435, 437, 438 or 439 and more preferably one or more of the following modifications: D280H, D280Q, D280Y, K290G, K290S, K290T, K290Y, E294N, Q295K, Y296P, S298D, S298N, S298P, S298V, Y300I, Y300L; wherein such antibodies show altered effector function relative to antibodies having a wild-type Fe region lacking such modification;
(III) an amino acid modification at one or more of the following positions: 255, 256, 258, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 300, 301, 303, 305, 307, 309, 312, 320, 322, 326, 329, 330, 332, 331, 333, 334, 335, 337, 338, 339, 340, 359, 360, 373, 376, 416, 419, 430, 434, 435, 437, 438, 439, and more preferably one or more of the following modifications: T256A, H268N, E272Q, N286D, N286Q, N286S, K290A, K290S, S298A, R301M, D312A, K320E, K320M,
K320Q, K320R, K322E, K326A, K326D, K326E, K326N, K326S, A33OK, A339T,
E333A, K334A, K334E, K334H, K334L, K334M, K334Q, K334V, T335K, T335Q,
T359A, K360A, E430A; wherein such antibodies show altered effector function relative to antibodies having a wild-type Fe region lacking such modification;
(IV) an amino acid modification at one or more of the following positions: 252, 254, 265, 268, 269, 270, 278, 289, 292, 293, 294, 295, 296, 298, 300, 301, 303, 322, 324, 327, 329, 333, 335, 338, 340, 373, 376, 382, 388, 389, 414, 416, 419, 434, 435, 437, 438, or 439; wherein such antibodies show reduced effector function relative to antibodies having a wild-type Fe region lacking such modification;
(V) an amino acid modification at one or more of the following positions: 280, 283, 285, 286, 290, 294, 295, 298, 300, 301, 305, 307, 309, 312, 315, 331, 333, 334, 337, 340, 360, 378, 398, or 430; wherein such antibodies show enhanced effector function relative to antibodies having a wild-type Fe region lacking such modification;
<img file="MX345232B_D0057.tif" />
IMPI
INSTITUTO MEXICANO DE LA PROFltDAD Industrial (VI) a modification of amino acids in one or more of the following positions: R255A, T256A, E258A, S267A, H268A, H268N, E272A, E272Q, N276A, D280A, E283A, H285A, N286D, N286Q, N286S, K290A, K290S, R301M, K320E, K320M, K320Q, K320R, K322E, K326A, K326D, K326E, K326S, A330K, P331A, T335Q, S337A, E430A; wherein such antibodies show enhanced effector function relative to antibodies having a wild-type Fe region lacking such modification.
In other embodiments, the invention encompasses the use of any Fe variant known in the art, such as those disclosed in Jefferis, BJ et al. (2002) "Interaction Sites On Human IgG-Fc For FcgammaR: Current Models", Immunol. Lett. 82: 57-65; Presta, LG et al. (2002) "Engineering Therapeutic Antibodies For Impraved Function", Biochem. Soc. Trans. 30: 487-90; Idusogie, EE et al. (2001) "Engineered Antibodies With Increased Activity To Recruit Complemenf ', J. Immunol. 166: 2571-75; Shields, RL et al. (2001) "High Resolution Mapping Of The Binding Site On Human IgGl For Fe Gamma RI, Fe Gamma RH, Fe Gamma RUI, And FcRn And Design Of IgGl Variants With Improved Binding To The Fe gamma R", J. Biol. Chem. 276: 6591-6604; Idusogie, EE et al. (2000) "Mapping Of The Clq Binding Site On Rituxan, A Chimeric Antibody With A Human IgG Fe", J. Immunol. 164: 4178-84; Reddy, MP et al. (2000) "Elimination Of Fe Receptor-Dependent Effector Functions Of A Modified IgG4 Monoclonal Antibody To Human CD4", J. Immunol. 164: 1925-1933; Xu, D. et al. (2000) "In Vitro Characterization of Five Humanized OKT3 Effector Function Variant Antibodies", Cell. Immunol. 200: 16-26; Armor, KL et al. (1999) "Recombinant human IgG Molecules Lacking Fcgamma Receptor I Binding AndMonocyte Triggering Activities", Eur. J. Immunol. 29: 2613-24; Jefferis, R. et al. (1996) "Modulation Of Fc (Gamma) R And Human Complement Activation By IgG3-Core Oligosaccharide Interactions", Immunol. Lett. 54: 101-04; Lund, J. et al. (1996) "Multiple Interactions Of IgG With Its Core Oligosaccharide Can Modulate Recognition By Complement And Human Fe Gamma Receptor And Influence The Synthesis Oflts Oligosaccharide Chains", J. Immunol. 157: 4963-4969; Hutchins et al. (1995) "Improved Biodistribution, Tumor Targeting, And Reduced Immunogenicity In Mice With A Gamma 4 Variant Of Campath-1H", Proc. Nati. Acad. Sci. (USA) 92: 11980-84; Jefferis, R. et al. (1995) "Recognition Sites On Human IgG For Fe Gamma Receptors: The Role Of Glycosylation", Immunol. Lett. 44: 111-17; Lund, J. et al. (1995) "Oligosaccharide-Protein Interactions In IgG Can Modulate Recognition By Fe Gamma Receptors", FASEB J. 9: 115-19; Alegre, ML et al. (1994) "A Non-Activating" Humanized "Anti74
<img file="MX345232B_D0058.tif" />
IMPI
MEXICAN INSTITUTE
BE LA PXOnEDA> INDUSTRIAL
CD3 Monoclonal Antibody Retains Immunosuppressive Properties In Vivo ”, Transplantation
57: 1537-1543; Lund et al. (1992) “Multiple Binding Sites On The CH2 LJomdin UJ JgGTUF MUUSH
Fe Gamma Rll ”, Mol. Immunol. 29: 53-59; Lund et al. (1991) "Human Fe Gamma RI And Fe
Gamma Rll Interact With Distinct But Overlapping Sites On Human IgG ”, J. Immunol. 147: 26575-2662; Duncan, AR et al. (1988) “Localization Of The Binding Site For The Human High-Affinity
Fe Receptor On IgG ", Nature 332: 563-564; US Patents No.<sup>you</sup> 5.624.821; 5885.573;
6,194,551; 7,276,586 and 7,317,091; and PCT publications WO 00/42072 and PCT WO 99/58572.
The invention encompasses molecules that comprise variant Fe regions consisting of or comprising any of the mutations listed in the table below in Table 1.
Table 1 ____________________ Example Fe Modifications Single Site Substitutions
<td>S132I</td><td>F241W</td><td>D265N</td><td>D280Q</td><td>Y296T</td><td>D312A</td><td>L328I</td><td>K334E</td>
<td>A162V</td><td>F241Y</td><td>D265Q</td><td>D280Y</td><td>N297D</td><td>W313F</td><td>L328K</td><td>K334H</td>
<td>S219Y</td><td>F241Y</td><td>D265T</td><td>G281D</td><td>N297E</td><td>N315I</td><td>L328M</td><td>K334I</td>
<td>K222N</td><td>F243D</td><td>D265V</td><td>G281K</td><td>N297I</td><td>E318K</td><td>L328N</td><td>K334L</td>
<td>H224L</td><td>F243H</td><td>D265Y</td><td>G281P</td><td>N297S</td><td>K320E</td><td>L328P</td><td>K334M</td>
<td>T225S</td><td>F243L</td><td>V266A</td><td>G281Y</td><td>S298A</td><td>K320M</td><td>L328Q</td><td>K334N</td>
<td>P228E</td><td>F243L</td><td>V266I</td><td>V282M</td><td>S298D</td><td>K320Q</td><td>L328R</td><td>K334Q</td>
<td>P228G</td><td>F243Q</td><td>V266M</td><td>E283A</td><td>S298N</td><td>K320R</td><td>L328S</td><td>K334V</td>
<td>P228K</td><td>F243R</td><td>V266T</td><td>V284E</td><td>S298N</td><td>K322E</td><td>L328T</td><td>T335K</td>
<td>P228Y</td><td>F243W</td><td>S267A</td><td>V284L</td><td>S298N</td><td>V323I</td><td>L328V</td><td>T335Q</td>
<td>P230A</td><td>F243Y</td><td>H268A</td><td>V284N</td><td>S298P</td><td>N325A</td><td>L328W</td><td>I336E</td>
<td>P230E</td><td>P244H</td><td>H268N</td><td>V284T</td><td>S298V</td><td>N325D</td><td>L328Y</td><td>I336K</td>
<img file="MX345232B_D0059.tif" />
IMPI
INSTITUTO MEXICANO Di LAPROP — AD INDUSTRIAL
<td colspan="8">Table 1 . __________ Modifications of Faith by way of example</td>
<td>P230G</td><td>P245A</td><td>D270E</td><td>V284Y</td><td>T299A</td><td>N325E</td><td>A33OI</td><td>I336Y</td>
<td>P230Y</td><td>P247G</td><td>P271A</td><td>H285A</td><td>T299D</td><td>N325F</td><td>A33OK</td><td>S337A</td>
<td>A231E</td><td>P247L</td><td>P271D</td><td>N286A</td><td>T299E</td><td>N325G</td><td>A33OL</td><td>A339T</td>
<td>A231G</td><td>P247V</td><td>P271E</td><td>N286D</td><td>T299F</td><td>N325H</td><td>A33OS</td><td>M352L</td>
<td>A231K</td><td>K248M</td><td>P271F</td><td>N286S</td><td>T299G</td><td>N325I</td><td>A33OV</td><td>T359A</td>
<td>A231P</td><td>R255A</td><td>P271G</td><td>K288N</td><td>T299H</td><td>N325K</td><td>A33OY</td><td>T359N</td>
<td>A231Y</td><td>T256A</td><td>P271H</td><td>K290A</td><td>T299I</td><td>N325L</td><td>P331A</td><td>K360A</td>
<td>P232E</td><td>E258A</td><td>P271I</td><td>K290G</td><td>T299K</td><td>N325M</td><td>I332A</td><td>T366N</td>
<td>P232G</td><td>V262A</td><td>P271K</td><td>K290S</td><td>T299L</td><td>N325P</td><td>I332D</td><td>T366S</td>
<td>P232K</td><td>V262E</td><td>P271L</td><td>K290T</td><td>T299M</td><td>N325R</td><td>I332E</td><td>F372Y</td>
<td>P232Y</td><td>V262F</td><td>P271M</td><td>K290Y</td><td>T299N</td><td>N325S</td><td>I332F</td><td>F372Y</td>
<td>E233D</td><td>V262I</td><td>P271N</td><td>P291D</td><td>T299P</td><td>N325T</td><td>I332G</td><td>I377F</td>
<td>E233G</td><td>V262T</td><td>P271Q</td><td>P291E</td><td>T299Q</td><td>N325V</td><td>I332H</td><td>I377N</td>
<td>L234I</td><td>V263A</td><td>P271R</td><td>P291G</td><td>T299R</td><td>N325W</td><td>I332K</td><td>V379L</td>
<td>L235D</td><td>V263I</td><td>P271S</td><td>P291H</td><td>T299S</td><td>N325Y</td><td>I332L</td><td>V379M</td>
<td>S239D</td><td>V263M</td><td>P271T</td><td>P291I</td><td>T299V</td><td>K326A</td><td>I332M</td><td>K392R</td>
<td>S239E</td><td>V263T</td><td>P271V</td><td>P291Q</td><td>T299W</td><td>K326D</td><td>I332N</td><td>P396H</td>
<td>S239N</td><td>V264A</td><td>P271W</td><td>P291T</td><td>T299Y</td><td>K326E</td><td>I332P</td><td>P396L</td>
<td>S239Q</td><td>V264E</td><td>P271Y</td><td>R292G</td><td>Y300I</td><td>K326E</td><td>I332Q</td><td>L398V</td>
<td>V240A</td><td>V264F</td><td>E272A</td><td>R292L</td><td>Y300L</td><td>K326N</td><td>I332R</td><td>S400P</td>
<td>V240I</td><td>V264I</td><td>E272Q</td><td>E294N</td><td>R301M</td><td>K326S</td><td>I332S</td><td>D401V</td>
<td>V240M</td><td>V264R</td><td>V273I</td><td>Q295K</td><td>R301M</td><td>K326T</td><td>I332T</td><td>S407I</td>
<td>V240T</td><td>V264T</td><td>F275L</td><td>Y296D</td><td>V302I</td><td>L328A</td><td>I332V</td><td>K414N</td>
<td>F241E</td><td>V264W</td><td>F275W</td><td>Y296E</td><td>S304D</td><td>L328D</td><td>I332W</td><td>E430A</td>
<td>V241I</td><td>D265F</td><td>F275Y</td><td>Y296H</td><td>S304H</td><td>L328E</td><td>I332Y</td><td></td>
<td>F241L</td><td>D265H</td><td>N276A</td><td>Y296N</td><td>S304L</td><td>L328F</td><td>E333A</td><td></td>
<td>F241R</td><td>D265I</td><td>D280A</td><td>Y296P</td><td>S304N</td><td>L328G</td><td>K334A</td><td></td>
<td>F241S</td><td>D265L</td><td>D280H</td><td>Y296Q</td><td>S304T</td><td>L328H</td><td>K334E</td><td></td>
<td colspan="8">Two-site substitutions</td>
<td colspan="2">I332E, A330L</td><td colspan="2">S239N / I332Q</td><td colspan="2">V279L, P395S</td><td colspan="2">P396L, P217S</td>
<td colspan="2">I332E, L328D</td><td colspan="2">S239Q / I332D</td><td colspan="2">V284A, F372L</td><td colspan="2">P396L, P227S</td>
<td colspan="2">I332E, L328E</td><td colspan="2">S239Q / I332E</td><td colspan="2">K288N, K326N</td><td colspan="2">P396L, V323I</td>
<td colspan="2">I332E, L328H</td><td colspan="2">S239Q / I332N</td><td colspan="2">K288N, A330S</td><td colspan="2">P396L, V240A</td>
<td colspan="2">I332E, L328I</td><td colspan="2">S239Q / I332Q</td><td colspan="2">K290E, L142P</td><td colspan="2">P396L, L242F</td>
<td colspan="2">I332E, L328M</td><td colspan="2">V240I, V281M</td><td colspan="2">K290E, P227S</td><td colspan="2">P396L, P244H</td>
<td colspan="2">I332E, L328N</td><td colspan="2">F241L, E258G</td><td colspan="2">K290T, G371D</td><td colspan="2">P396L, T250A</td>
<td colspan="2">I332E, L328Q</td><td colspan="2">F241L / V262I</td><td colspan="2">P291S, P353Q</td><td colspan="2">P396L, R255L</td>
<td colspan="2">I332E, L328T</td><td colspan="2">F243L, E318K</td><td colspan="2">R292P, V305I</td><td colspan="2">P396L, E258D</td>
<td colspan="2">I332E, L328V</td><td colspan="2">F243I, V379L</td><td colspan="2">S298A / I332E</td><td colspan="2">P396L, H268D</td>
<td colspan="2">I332E, N297D</td><td colspan="2">P243L / V264I</td><td colspan="2">S298N, W381R</td><td colspan="2">P396L, H268N</td>
<td colspan="2">I332E, N297E</td><td colspan="2">K246T, Y319F</td><td colspan="2">S298N, S407R</td><td colspan="2">P396L, V303I</td>
<td colspan="2">I332E, N297S</td><td colspan="2">K246T, P396H</td><td colspan="2">K317N, F423-DEL</td><td colspan="2">P396L, K326I</td>
<td colspan="2">S166N, K409R</td><td colspan="2">P247H, G285E</td><td colspan="2">K326E, K320E</td><td colspan="2">P396L, V305L</td>
<td colspan="2">P232S, S304G</td><td colspan="2">P247L, I377F</td><td colspan="2">K326E, A330T</td><td colspan="2">P396L, L358P</td>
<td colspan="2">S239D / I332D</td><td colspan="2">P247L, E389G</td><td colspan="2">K326E, G385E</td><td colspan="2">P396L, K370E</td>
<img file="MX345232B_D0060.tif" />
IMPI nwnvTo Mexican
DE LA Moneda industrial
<td colspan="6">Modifications of Faith by way of example</td>
<td>S239D / I332E</td><td colspan="2">P247S, P396L</td><td colspan="2">A330V, Q419H</td><td>P396L, S375C</td>
<td>S239D / I332N</td><td colspan="2">P247L, L398Q</td><td colspan="2">K334E, E233D</td><td>P396L, V379M</td>
<td>S239D / I332Q</td><td colspan="2">P247L, L406F</td><td colspan="2">K334N, K246I</td><td>P396L, N384K</td>
<td>S239E / D265N</td><td colspan="2">P247L, N421K</td><td colspan="2">K334E, K288M</td><td>P396L, K392T</td>
<td>S239E / D265Q</td><td colspan="2">L251F, F372L</td><td colspan="2">K334E, R292L</td><td>P396L, S400F</td>
<td>S239E / I332D</td><td colspan="2">L251F, S415I</td><td colspan="2">K334E, E308D</td><td>P396L, L410H</td>
<td>S239E / I332E</td><td colspan="2">R255L, E318K.</td><td colspan="2">K334E, E380D</td><td>P396L, Q419H</td>
<td>S239E / I332N</td><td colspan="2">R255Q, K326E</td><td colspan="2">K334N, P396L</td><td>P396L, Q419L</td>
<td>S239E / I332Q</td><td colspan="2">E258D, N384K</td><td colspan="2">A339V, Q347H</td><td>P396L, V427A</td>
<td>S239N / I332D</td><td colspan="2">V263Q, E272D</td><td colspan="2">K370N, S440N</td><td>D399E, G402D</td>
<td>S239N / I332E</td><td colspan="2">V264I / I332E</td><td colspan="2">T394M, V397M</td><td>D399E, M428L</td>
<td>S239N / I332N</td><td colspan="2">H268D, E318D</td><td colspan="2">P396L, K210M</td><td></td>
<td colspan="6">Three-site substitutions</td>
<td colspan="2">V185M, R292L, D399E</td><td colspan="2">P217S, A378V, S408R</td><td colspan="2">K218R, G281D, G385R</td>
<td colspan="2">S192T, M252L, R301C</td><td colspan="2">P247L, I253N, K334N</td><td colspan="2">P247L, A33OT, S440G</td>
<td colspan="2">V125L, V215I, S408I</td><td colspan="2">D312E, K327N, I378S</td><td colspan="2">T355N, P387S, H435Q</td>
<td colspan="2">R292L, T359N, P396L</td><td colspan="2">E216D, E345K, S375I</td><td colspan="2">P247L, A431V, S442F</td>
<td colspan="2">F275I, K334N, V348M</td><td colspan="2">K288N, A330S, P396L</td><td colspan="2">A378V, N3901, V422I</td>
<td colspan="2">F243L, R255L, E318K</td><td colspan="2">G316D, A378V, D399E</td><td colspan="2">V282E, V369I, L406F</td>
<td colspan="2">K334E, T359N, T366S</td><td colspan="2">N315I, V379M, T394M</td><td colspan="2">V397M, T411A, S415N</td>
<td colspan="2">K288N, A33OS, P396L</td><td colspan="2">P247L, W313R, E388G</td><td colspan="2">T223I, T256S, L406F</td>
<td colspan="2">F243I, V379L, G420V</td><td colspan="2">R301H, K340E, D399E</td><td colspan="2">K246N, P396L, Q419R</td>
<td colspan="2">A231V, Q386H, V412M</td><td colspan="2">K326I, P396L, S408N</td><td colspan="2">P217A, T359A, P396L</td>
<td colspan="2">E216D, K334R, S375I</td><td colspan="2">K210M, K261N, P396L</td><td colspan="2">V215I, K290V, P396L</td>
<td colspan="2">T335N, P387S, H435Q</td><td colspan="2">A33OV, G427M, K438R</td><td colspan="2">V263Q, E272D, Q419H</td>
<td colspan="2">K246I, Q362H, K370E</td><td colspan="2">K222E, V263Q, S298N</td><td colspan="2">N276Y, T393N, W417R</td>
<td colspan="2">K334E, E380D, G446V</td><td colspan="2">E233G, P247S, L306P</td><td colspan="2">D270E, G316D, R416G</td>
<td colspan="2">V3O3I, V369F, M428L</td><td colspan="2">S219T, T225K, D270E</td><td colspan="2">D270E, K392T, P396L</td>
<td colspan="2">K246E, V284M, V308A</td><td colspan="2">R292P, F243L, V305I</td><td colspan="2">R255L, D270E, P396L</td>
<td colspan="2">E293V, Q295E, A327T</td><td colspan="2">V284M, R292L, K370N</td><td colspan="2">V240A, D270E, P396L</td>
<td colspan="2">Y319F, P352L, P396L</td><td colspan="2">D270E, K370E, P396L</td><td colspan="2">270E, P396L, Q419HD</td>
<td colspan="2">K290T, N390I, P396L</td><td colspan="2">P247L, D270E, N421K</td><td colspan="2">S239D, A33OL, I332E</td>
<td colspan="2">N297D, A33OY, I332E</td><td colspan="2">Y296D, N297D, I332E</td><td colspan="2">S239D, A33OY, I332E</td>
<td colspan="2">N297D, T299L, I332E</td><td colspan="2">Y296E, N297D, 1332 E</td><td colspan="2">S239D, I332E, A33OI</td>
<td colspan="2">N297D, T299I, I332E</td><td colspan="2">Y296H, N297D, I332E</td><td colspan="2">S239D, N297D, I332E</td>
<td colspan="2">N297D, T299L, I332E</td><td colspan="2">Y296N, N297D, I332E</td><td colspan="2">S239D, S298A, I332E</td>
<td colspan="2">N297D, T299V, I332E</td><td colspan="2">Y296Q, N297I, I332E</td><td colspan="2">S239D, V2641I, I332E</td>
<td colspan="2">F243L, V262I, V264W</td><td colspan="2">Y296T, N297D, I332E</td><td colspan="2">S239E, N297D, I332E</td>
<td colspan="2">D265F, N297E, I332E</td><td colspan="2">P230A, E233D, I332E</td><td colspan="2">S239E, V2641,1332 E</td>
<td colspan="2">D265Y, N297D, I332E</td><td colspan="2">P244H, P245A, P247V</td><td colspan="2">S239N, A330L, I332E</td>
<td colspan="2">V264E, N297D, I332E</td><td colspan="2">V264I, A33OY, I332E</td><td colspan="2">S239N, A330Y, I332E</td>
<td colspan="2">V264I, A33OL, I332E</td><td colspan="2">V264I, S298A, I332E</td><td colspan="2">S239Q, V264I, I332E</td>
<td colspan="6">Four-site substitutions</td>
<td colspan="3">A141V, H268L, K288E, P291S</td><td colspan="3">T256S, V305I, K334E, N390S</td>
<td colspan="3">E258D, T289A, H310Y, Y407V</td><td colspan="3">D280E, S354F, A431D, L441I</td>
IMPIAS
MEXICAN INSTITUTE
M LA UGLY * INDUSTRIAL
<td colspan="2">Table 1 -- Modifications of Faith by way of example</td>
<td>K334E, T359N, T366S, Q386R</td><td>P343S, P353L, S375I, S383N</td>
<td>K326Q, K334E, T359N, T366S</td><td>E269K, K290N, Q31 IR, H433Y</td>
<td>K288R, T307A, K344E, P396L</td><td>K290E, V369A, T393A, P396L</td>
<td>V273I, K326E, L328I, P396L</td><td>K210N, K222I, K320M, P396L</td>
<td>F275L, Q362H, N384K, P396L</td><td>S219T, T225K, D270E, K360R</td>
<td>V282L, A330V, H433Y, T436R</td><td>P243L, S254T, A330V, N361D</td>
<td>R255L, D270E, Y300L, P396L,</td><td>F243L, D270E, K392N, P396L</td>
<td>R255L, D270E, R292G, P396L</td><td>F243L, R255L, D270E, P396L</td>
<td>V284M, S298N, K334E, R355W</td><td>S239D, D265F, N297D, I332E</td>
<td>D265Y, N297D, T299L, I332E</td><td>S239D, D265H, N297D, I332E</td>
<td>F241E, F2430, V262T, V264F</td><td>S239D, D265I, N297D, I332E</td>
<td>F241E, F243R, V262E, V264R</td><td>S239D, 0265L, N297D, I332E</td>
<td>F241E, F243Y, V262T, V264R</td><td>S239D, D265T, N297D, I332E</td>
<td>F241L, F243L, V262I, V264I</td><td>S239D, D265V, N297D, I332E</td>
<td>F241R, F2430, V262T, V264R</td><td>S239D, D265Y, N297D, I332E</td>
<td>F241W, F243W, V262A, V264A</td><td>S239D, N297D, I332E, A330Y</td>
<td>F241Y, F243Y, V262T, V264T</td><td>S239D, N297D, I332E, K326E</td>
<td>N297D, 1332E, S239D, A33OL</td><td>S239D, N297D, I332E, L235D</td>
<td>N297D, S298A, A330Y, I 332E</td><td>S239D, V264I, A330L, I332E</td>
<td>S239D, A330Y, I332E, K326E</td><td>S239D, V264I, S298A, I332E</td>
<td>S239D, A330Y, I332E, K326T</td><td>S239E, V264I, A33OY, 1332 E</td>
<td>S239D, A330Y, I332E, L234I</td><td>S239D, A330Y, I332E, V264T</td>
<td>S239D, A330Y, I332E, L235D</td><td>S239D, A33OY, I332E, V266I</td>
<td>S239D, A330Y, I332E, V240I</td><td></td>
<td colspan="2">Five site substitutions</td>
<td>V284M, S298N, K334E, R355W, R416T</td><td>K147T, Y202M, F275I, K334N, V348M</td>
<td>P217S, V305I, I309L, N390H, P396L</td><td>T335N, K370E, A378V, T394M, S424L</td>
<td>F243L, V305I, A378D, P396L, F404S</td><td>P244H, L358M, V379M, N384K, V397M</td>
<td>K222N, T335N, K370E, A378V, T394M</td><td>P244A, K326I, C367R, S375I, K447T</td>
<td>L235P, S304G, V305I, V323I, V382M</td><td>C229Y, A287T, V379M, P396L, L443V</td>
<td>F241E, F2430, V262T, V264E, I332E</td><td>F241R, F243Q, V262T, V264R, I332E</td>
<td>F241E, F243R, V262E, V264R, I332E</td><td>S239E, V264I, S298A, A330Y, I332E</td>
<td>F241E, F243Y, V262T, V264R, I332E</td><td></td>
<td colspan="2">Substitutions of more than five sites</td>
<td colspan="2">D221E, D270E, V308A, Q311H, P396L, G402D</td>
<td colspan="2">T215P, K274N, A287G, K334N, L365V, P396L</td>
<td colspan="2">F241Y, F243Y, V262T, V264T, N297D, I332E</td>
<td colspan="2">N297D, T299F, I332E, N297D, T299H, I332E</td>
<td colspan="2">D221Y, M252I, A330G, A339T, T359N, V422I, H433L</td>
<td colspan="2">S239D, N297D, I332E, A330Y, F241S, F243H, V262T, V264T</td>
<td colspan="2">K133M, F149Y, K205E, R214I, K218E, S383N, N384K, T256N, V262L</td>
In specific embodiments, the variant Fe region of such anti-B7-H3 antibodies has:
<img file="MX345232B_D0061.tif" />
IMPI
NSTTTUT · MEXICAN DE LA noraoAD INDUmUAL (1) a leucine at position 247, a lysine at position 421 and a glutamic acid at position 270;
(2) a threonine at position 392, a leucine at position 396, a glutamic acid at position 270, and a leucine at position 243 (3) a histidine at position 419, a leucine at position 396, and an acid glutamic at position 270;
(4) a histidine at position 419, a leucine at position 396, a glutamic acid at position 270, and a leucine at position 243;
(5) an alanine at position 240, a leucine at position 396, and a glutamic acid at position 270;
(6) a lysine at position 255 and a leucine at position 396;
(7) a lysine at position 255, a leucine at position 396, and a glutamic acid at position 270;
(8) a lysine at position 255, a leucine at position 396, a glutamic acid at position 270, and a lysine at position 300;
(9) a lysine at position 255, a leucine at position 396, a glutamic acid at position 270, and a glycine at position 292;
(10) a lysine at position 255, a leucine at position 396, a glutamic acid at position 270, and a leucine at position 243;
(11) a glutamic acid at position 370, a leucine at position 396 and a glutamic acid at position 270;
(12) a glutamic acid at position 270, an aspartic acid at position 316, and a glycine at position 416;
(13) a leucine at position 243, a proline at position 292, an isoleucine at position 305, and a leucine at position 396;
(14) a leucine at position 243, a glutamic acid at position 270, an asparagine at position 392, and a leucine at position 396;
(15) a leucine at position 243, a leucine at position 255, a glutamic acid at position 270, and a leucine at position 396;
(16) a glutamine at position 297;
or (17) any combination of the substitutions (1) - (16) above.
<img file="MX345232B_D0062.tif" />
IMPI ÍNSTlTUr MKICAN · DEUnovtWAD INDuntlAl.
In some embodiments, the molecules of the invention further comprise one or more glycosylation sites, such that one or more carbohydrate moieties are covalently attached to the molecule. Preferably, molecules of the invention with one or more glycosylation sites and / or one or more modifications in the Fe region confer or have an enhanced antibody-mediated effector function, eg, enhanced ADCC activity, compared to a parent antibody. . In some embodiments, the invention further comprises molecules that comprise one or more amino acid modifications that are known directly or indirectly to interact with a carbohydrate residue of the antibody, including, but not limited to, amino acids at positions 241, 243, 244, 245, 245, 249, 256, 258, 260, 262, 264, 265, 296, 299 and 301. Amino acids that interact directly or indirectly with a carbohydrate residue of an antibody are known in the art, see, for example, Jefferis et al., 1995 Immunology Letters, 44: 111-7, which is incorporated herein as reference in its entirety.
In another embodiment, the invention encompasses molecules that have been modified by introducing one or more glycosylation sites at one or more sites of the molecules, preferably without altering the functionality of the molecules, for example, FcyR or target antigen binding activity. . Glycosylation sites can be introduced in the variable and / or constant region of the molecules of the invention. As used herein, "glycosylation sites" include any specific amino acid sequence in an antibody to which an oligosaccharide (ie, carbohydrates containing two or more simple sugars linked together) will specifically and covalently bind. ). Oligosaccharide side chains are normally attached to the backbone of an antibody via either N or O linkages. N-linked glycosylation refers to the attachment of an oligosaccharide residue to the side chain of an asparagine residue. O-linked glycosylation refers to the attachment of an oligosaccharide residue to a hydroxyamino acid, eg, serine, threonine. The molecules of the invention may comprise one or more glycosylation sites, including N-linked and O-linked glycosylation sites. Any glycosylation site for N-linked or O-linked glycosylation known in the art can be used in accordance with the present invention. An exemplary N-linked glycosylation site that is useful in accordance with the methods of the present invention is the amino acid sequence: Asn-X-Thr / Ser, where X can be any amino acid and Thr / Ser indicates a threonine or a serine. Such a site or sites can be introduced into a molecule of the invention using methods well known in the art.
IMPI INSTITUTO MlXlCANO diiafíctmKed iNDurnuAi technique to which this invention relates (see, for example, In vitro Mutagenesis, Recombinant DNA: A SHORT COURSE, JD Watson, et al. WH Freeman and Company, New York, 1983, Chapter 8, pp. 106-116, which is incorporated herein by reference in its entirety. An exemplary method of introducing a glycosylation site into a molecule of the invention may comprise: modifying or mutating an amino acid sequence of the molecule so that the desired Asn-X-Thr / Ser sequence is obtained.
In some embodiments, the invention encompasses methods of modifying the carbohydrate content of a molecule of the invention by adding or removing a glycosylation site. Methods for modifying the carbohydrate content of antibodies are well known in the art and are encompassed within the invention, see, for example, US Patent No. 6,218,149; EP 0 359 096 Bl; US Publication No. US 2002/0028486; WO 03/035835; US Publication No. 2003/0115614; US Patent No. 6,218,149; US Patent No. 6,472,511; all of which are incorporated herein by reference in their entirety. In other embodiments, the invention encompasses methods of modifying the carbohydrate content of a molecule of the invention by removing one or more endogenous carbohydrate moieties from the molecule. In a specific embodiment, the invention encompasses displacing the glycosylation site of the Fe region of an antibody, modifying the positions adjacent to 297. In a specific embodiment, the invention encompasses modifying position 296 so that position 296 and not position 297 is then glycosylated.
The effector function can also be modified by techniques such as introducing one or more cistern residues in the Fe region, thus allowing the formation of interchain disulfide bonds to occur in this region, resulting in the generation of a homodimeric antibody that may have an enhanced internalization capacity and / or increased complement-mediated cell killing and ADCC (Carón, PC et al. (1992) "Engineered Humanized Dimeric Forms Of IgG Are More Effective Antibodies", J. Exp. Med. 176: 1191-1195; Shopes, B. (1992) "A Genetically Engineered Human IgG Mutant With Enhanced Cytolytic Activity", J. Immunol. 148 (9): 2918-2922. Homodimeric antibodies with enhanced antitumor activity can also be prepared using heterobifunctional crosslinking agents as described in Wolff, EA et al. (1993) "Monoclonal Antibody Homodimers: Enhanced Antitumor Activity In Nude Mice", Cancer Research 53: 2560-2565. Alternatively, an antibody can be engineered that has double Fe regions and that 81
<img file="MX345232B_D0063.tif" />
PREVENT
INSTITUTO MBXICANO Έ, * · · LA FROHMAD Ό * ι industrial therefore may have enhanced ADCC and complement lysis capabilities (Stevenson, GT et al. (1989) “A Chimeric Antibody With Dual Fe Regions (bisFabFc) Prepared By Manipulations At The IgG Hinge ", Anti-Cancer Drug Design 3: 219-230).
E. B7-H3 DART ™ (double affinity redirection reagents)
As discussed above, the present invention further encompasses "DART ™" (dual affinity redirecting reagent) molecules that comprise at least two polypeptide chains that form at least two epitope-binding sites, at least one of which is linked. specifically binds to B7-H3.
In preferred embodiments, the DART ™ first polypeptide chain comprises:
(i) a domain (A) comprising a binding region of a light chain variable domain of a first immunoglobulin (VL1) specific for an epitope (1);
(ii) a domain (B) comprising a binding region of a heavy chain variable domain of a second immunoglobulin (VH2) specific for an epitope (2); and (iii) a domain (C).
The second polypeptide chain of such a DART ™ comprises:
(i) a domain (D) comprising a binding region of a second epitope-specific immunoglobulin (VL2) light chain variable domain (2);
(ii) a domain (E) comprising a binding region of a heavy chain variable domain of the first epitope-specific immunoglobulin (VH1) (1); and (iii) a domain (F).
The (A) and (B) domains of DART ™ are not associated with each other to form an epitope binding site. Similarly, the (D) and (E) domains of DART ™ are not associated with each other to form an epitope binding site. Instead, the (A) and (E) domains of DART ™ associate to form a binding site that binds to the (1) epitope; said domains (B) and (D) of DART ™ associate to form a binding site that binds to said epitope (2). The domains (C) and (F) are covalently associated with each other.
Each polypeptide chain in the DART ™ molecule comprises a VL domain and a VH domain, which are covalently linked in such a way as to prevent the domains from self-assembling. The interaction of two of the polypeptide chains will produce two VL-VH pairings, forming two epitope binding sites, that is, one bivalent molecule. Neither the VH nor the VL domain is limited to any position within the polypeptide chain, that is, 82
IMPI
MMUCANO INSTITUTE
Oi THE INDUSTRIAL PROFHDAD is limited to the amino (N) terminal or carboxyl (C) terminal end, nor are the domains limited in terms of their relative positions to each other, that is, the VL domain can be N-terminal with respect to the VH domain and vice versa. The only restriction is that a complementary polypeptide chain is available in order to form functional DART ™. When the VL and VH domains are derived from the same antibody, the two complementary polypeptide chains can be identical. For example, when the binding domains are derived from an antibody specific for the A epitope (i.e., the binding domain is formed from a VLa-VHa interaction), each polypeptide will comprise a VH<sub>TO</sub> and a VL<sub>TO</sub>. Homodimerization of two polypeptide chains of the antibody will result in the formation of two VLa-VHa binding sites, resulting in a monospecific bivalent antibody. When the VL and VH domains are derived from antibodies specific for different antigens, the formation of a functional bispecific DART ™ requires the interaction of two different polypeptide chains, ie, formation of a heterodimer. For example, for a bispecific DART ™, a polypeptide chain will comprise a VL<sub>TO</sub> and a VL<sub>B</sub>; homodimerization of said chain will result in the formation of two VLa-VHb binding sites, either non-binding or unpredictable binding. In contrast, when two different polypeptide chains are free to interact, for example in a recombinant expression system, one comprising a VL<sub>TO </sub>and a VHb and the other comprising a VLb and a VHa, two different binding sites will be formed: VL<sub>TO</sub>-VH<sub>TO</sub> and VLb-VHb. For all DART ™ polypeptide chain pairs, the possibility of misalignment or misjoining of the two chains is a possibility, ie, the interaction of VL-VL or VH-VH domains; however, purification of functional diabodies is easily managed based on the immunospecificity of the appropriately dimerized binding site using any affinity-based method known in the art or exemplified herein, eg, affinity chromatography.
One or more of the DART ™ polypeptide chains may optionally comprise a Fe domain or part thereof (eg a CH2 domain or a CH3 domain). The Fe domain or part thereof can be derived from any immunoglobulin isotype or allotype including, but not limited to, IgA, IgD, IgG, IgE, and IgM. In preferred embodiments, the Fe domain (or part thereof) is derived from IgG. In specific embodiments, the IgG isotype is IgGl, IgG2, IgG3, or IgG4 or an allotype thereof. In one embodiment, the diabody molecule comprises an Fe domain, Fe domain comprising a CH2 domain and a CH3 domain independently selected from any isotype of
IMPI
ΙΝΤΠΤυΤΟ MEXICANO LA PURIDAD INDUSTRIAL immunoglobulin (i.e. an Fe domain comprising the CH2 domain derived from IgG and the CH3 domain derived from IgE, or the CH2 domain derived from IgGl and the CH3 domain derived from IgG2, etc.). The Fe domain can be engineered into a polypeptide chain comprising the diabody molecule of the invention at any position with respect to the other domains or parts of said polypeptide chain (for example, the Fe domain, or part thereof, it can be C-terminal to both the VL and VH domains of the chain polypeptide, it can be N-terminal to both the VL and VH domains; or it can be N-terminal with respect to one domain and C-terminal with respect to the other (ie, between two domains of the polypeptide chain)).
The Fe domains in the polypeptide chains of DART ™ molecules are preferably dimerized, resulting in the formation of a DART ™ molecule that exhibits immunoglobulin-like properties, eg, Fc-Fc and R interactions. Diabodies comprising Fe can be dimers, for example, composed of two polypeptide chains, each comprising a VH domain, a VL domain, and an Fe domain. The dimerization of said polypeptide chains results in a bivalent DART ™ comprising an Fe domain, albeit with a different structure from that of an unmodified bivalent antibody. Such DART ™ molecules will display altered phenotypes relative to a wild-type immunoglobulin, eg, altered serum half-life, binding properties, and the like. In other embodiments, the DART ™ molecules that comprise Fe domains can be tetramers. Such tetramers comprise two "heavier" polypeptide chains, that is, a polypeptide chain comprising a VL, a VH and an Fe domain, and two "lighter" polypeptide chains, that is, a polypeptide chain comprising a VL and a VH. The lighter and heavier chains interact to form a monomer, and these monomers interact through the unpaired Fe domains to form an Ig-like molecule. Such an Ig-type DART ™ is tetravalent and can be monospecific, bispecific, or tetra-specific.
The formation of a tetra-specific diabody molecule as described above requires the interaction of four different polypeptide chains. Such interactions are difficult to achieve effectively within a single cell recombinant production system, due to the many variants of possible strand mismatches. One solution to increase the likelihood of mismatches is to engineer "button eyelet" mutations in the desired polypeptide chain pairs. Tales 84
<img file="MX345232B_D0064.tif" />
IMPI rNjTmrr · mikicano rjRfiMjES * 'M THE FRORIITY ¿Ώ— LJ *<sup>8</sup>-, INDUSTRIAL mutations favor heterodimerization over homodimerization. For example, with respect to Fc-Fc interactions, an amino acid substitution (preferably a substitution with an amino acid comprising a bulky side group that forms a "button", eg, tryptophan) can be introduced into the CH2 or CH3 domain of such so that steric interference will prevent interaction with a similarly mutated domain and force the mutated domain to mate with a domain engineered into a complementary mutation, or accommodation, ie, the "eyelet" (eg, a glycine substitution). Such sets of mutations can be engineered into any pair of polypeptides that the diabody molecule comprises, and further, engineered into any part of the polypeptide chains of said pair. Methods of engineering protein design to promote heterodimerization over homodimerization are well known in the art, particularly with regard to engineering immunoglobulin-like molecules, and are encompassed herein (see for example, Ridgway et al. (1996) "'Knobs-Into-Holes' Engineering Of Antibody CH3 Domains For Heavy Chain Heterodimerization", Protein Engr. 9: 617-621, Atwell et al. (1997) "Stable Heterodimers Frorn Remodeling The Domain Interface Of A Homodimer Using A Phage Display Library", J. Mol. Biol. 270: 26-35, and Xie et al. (2005) "A New Format Of Bispecific Antibody: Highly Efficient Heterodimerization, Expression And Tumor Cell Lysis", J. Immunol. Methods 296: 95-101; each of which is incorporated herein by reference in its entirety.
The invention also encompasses diabody molecules comprising variant Fe or variant hinge-Fc domains (or part thereof), variant Fe domain comprising at least one amino acid modification (e.g. substitution, insertion, deletion) with respect to a comparable wild-type Fe domain or hinge-Fc domain (or part thereof). Molecules comprising variant Fe domains or hinge-Fc domains (or parts thereof) (eg, antibodies) typically have altered phenotypes relative to molecules comprising wild-type or Fc-hinge-Fc domains or Fe domains. parts of them. The variant phenotype can be expressed as altered serum half-life, altered stability, altered sensitivity to cellular enzymes, or altered effector function as assayed in an NK-dependent or macrophage-dependent assay. Fe domain modifications that are identified to alter effector function have been disclosed previously.
IMPI
KSTIJUTO MEXICANO M LA PROPERTY industtuai
The present invention also encompasses molecules that comprise a hinge domain. The hinge domain can be derived from any immunoglobulum isotype or allotype including IgA, IgD, IgG, IgE, and IgM. In preferred embodiments, the hinge domain is derived from IgG, where the IgG isotype is IgGl, IgG2, IgG3, or IgG4, or an allotype thereof. Said hinge domain can be engineered into a polypeptide chain comprising the diabody molecule together with an Fe domain such that the diabody molecule comprises a hinge-Fc domain. In certain embodiments, the hinge and Fe domains are independently selected from any immunoglobulin isotype known in the art or exemplified herein. In other embodiments the hinge and Fe domain domains are separated by at least one other domain of the polypeptide chain, eg, the VL domain. The hinge domain, or optionally the hinge-Fc domain, can be engineered into a polypeptide of the invention at any position relative to other domains or parts of said polypeptide chain. In certain embodiments, a polypeptide chain of the invention comprises a hinge domain, which hinge domain is at the C-end of the polypeptide chain, wherein said polypeptide chain does not comprise an Fe domain. In still other embodiments, A polypeptide chain of the invention comprises a hinge-Fc domain, hinge-Fc domain which is at the C-terminus of the polypeptide chain. In further embodiments, a polypeptide chain of the invention comprises a hinge-Fc domain, a hinge-Fc domain that is at the N-terminus of the polypeptide chain.
Each domain of the DART ™ polypeptide chain, ie, the VL, VH and Fe domain can be separated by a peptide linker. The peptide linker can be 0, 1,2,3,4, 5, 6, 7, 8, or 9 amino acids in length. In certain embodiments the amino acid sequence of the linker is GGGSGGGG (SEQ ID NO: 52) encoded by the nucleic acid sequence ggaggcggat ccggaggcgg aggc (SEQ ID NO: 53). The polypeptide chains of the DART ™ molecule can be engineered to comprise at least one cysteine residue that will interact with a homologous cistern residue in a second polypeptide chain of the DART ™ to form an interchain disulfide bond. Such interchain disulfide bonds serve to stabilize the DART ™ molecule, thus improving expression and recovery in recombinant systems, resulting in a stable and constant formulation and improving the stability of the isolated and / or purified product in vivo. The cysteine residue can be introduced as a single amino acid or as part of a sequence of
IMPI
WSTTTUTO MEXICANO DE LA FROEtEDAD INDUSTRIAL largest amino acids, for example a hinge domain, anywhere in the polypeptide chain. In a specific embodiment, the cysteine residue can be engineered to occur at the C-terminus of the polypeptide chain. In some embodiments, the cistern residue is introduced into the polypeptide chain within the amino acid sequence LGGC. In a specific embodiment, the C-terminus of the polypeptide chains comprising the DART ™ molecule of the invention comprises the amino acid sequence LGGC (SEQ ID NO: 54). In another embodiment, the cysteine residue is introduced into the polypeptide within an amino acid sequence comprising a hinge domain, for example EPKSCDKTHTCPP (SEQ ID NO: 55) or ESKYGPPCPS (SEQ ID NO: 56). In a specific embodiment, the C-terminal end of a polypeptide chain of the
DART ™ of the invention comprises the amino acid sequence of an IgG hinge domain, for example SEQ ID NO: 55 or SEQ ID NO: 56. In another embodiment, the C-terminal end of a polypeptide chain of a DART molecule ™ of the invention comprises the amino acid sequence VEPKSC (SEQ ID NO: 57), which can be encoded by the nucleotide sequence gttgagccca aatcttgt (SEQ ID NO: 58). In other embodiments, the cysteine residue is introduced into the polypeptide chain within the amino acid sequence LGGCFNRGEC (SEQ ID NO: 59), which can be encoded by the nucleotide sequence ctgggaggct gcttcaacag gggagagtgt (SEQ ID NO: 60). In a specific embodiment, the C-terminal end of a polypeptide chain comprising the DART ™ of the invention comprises the 20 amino acid sequence LGGCFNRGEC (SEQ ID NO: 59). In still other embodiments, the cysteine residue is introduced into the polypeptide chain within the amino acid sequence FNRGEC (SEQ ID NO: 61), which can be encoded by the nucleotide sequence ttcaacaggg gagagtgt (SEQ ID NO: 62). In a specific embodiment, the C-terminal end of a polypeptide chain comprising the DART ™ of the invention comprises the amino acid sequence FNRGEC (SEQ 25 ID NO: 61).
In certain embodiments, the diabody molecule comprises at least two polypeptide chains, each of which comprises the amino acid sequence LGGC (SEQ ID NO: 54) and are covalently linked by a disulfide bond between the cysteine residues in the LGGC sequences. (SEQ ID NO: 54). In another specific embodiment, the diabody molecule comprises at least two polypeptide chains, one of which comprises the sequence FNRGEC (SEQ ID NO: 61) while the other comprises a hinge domain (which contains at least one cysteine residue ), in which said at least two polypeptide chains 87
<img file="MX345232B_D0065.tif" />
IMPI
INSTITUTO MM1CANO BE LA FKDFUDAD INDUSTRIAL are covalently linked via a disulfide bond between the cysteine residue in FNRGEC (SEQ ID NO: 61) and a cistern residue in the hinge domain. In particular aspects, the cysteine residue responsible for the disulfide bond located in the hinge domain is Cys-128 (numbered according to Kabat EU; located in the hinge domain of an intact, unmodified IgG heavy chain) and the residue of Homologous cysteine in SEQ ID NO: 23 is Cys-214 (numbered according to Kabat EU; located at the C-terminus of an intact, unmodified IgG light chain) (Elkabetz et al. (2005) "Cysteines In CH1 Underlie Retention Of Unassembled Ig Heavy Chains", J. Biol. Chem. 280: 14402-14412). In still other embodiments, the at least one cysteine residue is engineered to occur at the N-terminus of the amino acid chain.
In still other embodiments, the at least one cysteine residue is engineered to occur in the linker portion of the polypeptide chain of the diabody molecule. In further embodiments, the VH or VL domain is engineered to comprise at least one amino acid modification relative to the original VH or VL domain such that said amino acid modification comprises a cysteine substitution of an original amino acid.
In yet another aspect of this embodiment, the domain (C) of the first polypeptide chain comprises the amino acid sequence VEPKSC (SEQ *) NO: 57), derived from the hinge domain of a human IgG, and which can be encoded by the sequence nucleotide gttgagccca aat cttgt (SEQ ID NO: 58). In another aspect of this embodiment, the domain (F) of the second polypeptide chain comprises the amino acid sequence VEPKSC (SEQ ID NO: 57). In certain aspects of this embodiment, the (C) domain of the first polypeptide chain comprises the C-terminal 6 amino acids of the human kappa light chain, FNRGEC (SEQ ID NO: 61); and the domain (F) of the second polypeptide chain comprises the amino acid sequence VEPKSC (SEQ ID NO: 57) or a hinge domain. In other aspects of this embodiment, the (F) domain of the second polypeptide chain comprises the C-terminal 6 amino acids of the human kappa light chain, FNRGEC (SEQ ID NO: 61); and domain (C) of the first polypeptide chain comprises the amino acid sequence VEPKSC (SEQ ID NO: 57) or a hinge domain.
As will be appreciated in light of the foregoing, individual polypeptides of a bispecific DART ™ can form two homodimer species and one heterodimer species. In one embodiment of the present invention, a charged polypeptide can be added
IMPI
INSTITUTO MEXICANO M LA PROMWaD INDUSTRIAL
<img file="MX345232B_D0066.tif" />
at the C-terminus of one, or more preferably, of both DART ™ p ^ iip¿nHHos. By selecting oppositely charged charged polypeptides for individual polypeptides of the bispecific DART ™, the inclusion of such charged polypeptides favors heterodimer formation and reduces homodimer formation. Preferably, a positively charged polypeptide will contain a substantial content of arginine, glutamine, histidine and / or lysine (or mixtures of such amino acids) and a negatively charged polypeptide will contain a substantial content of aspartate or glutamate (or a mixture of such amino acids). Positively charged polypeptides containing substantial lysine content and negatively charged polypeptides containing substantial glutamate content are particularly preferred. In order to maximize the electrostatic attraction between such oppositely charged polypeptides, it is preferred to employ polypeptides that can spontaneously assume a helical conformation.
Thus, in a preferred embodiment, a positively charged "E wrap" will be added to one of the polypeptides being used to form a bispecific DART ™ and a negatively charged "K wrap" will be added to the second of the DART polypeptides. ™. A particularly preferred E coil will have the sequence: (EVAALEK) 4 [ie (SEQ ID NO: 63) EVAALEKEVAALEKEVAALEKEVAALEK]. A particularly preferred K-coil will have the sequence: (KVAALKE) 4 [ie (SEQ ID NO: 64) KVAALKEKVAALKEKVAALKEKVAALKE].
A preferred DART ™ polypeptide exhibiting such an E-coil will have the general sequence: [VL domain] - [GGGSGGGG] - [VH domain] - [(EVAALEK) 4] -GGGNS, where VL is the domain DART ™ Variable Light Ig, GGGSGGGG is SEQ ID NO: 52, VH is the DART ™ Variable Heavy Ig Domain, (EVAALEK) 4 is SEQ ID NO: 63, and GGGNS is SEQ *) NO: 65. A preferred DART ™ polypeptide exhibiting such a K-coil will have the general sequence: [VL domain] - [GGGSGGGG] - [VH domain] - [(KVAALKE) 4] —GGGNS, where VL is the domain DART ™ Variable Light Ig, GGGSGGGG is SEQ ID NO: 52, VH is the DART ™ Variable Heavy Ig Domain, (KVAALKE)<sub>4</sub> is SEQ ID NO: 64, and GGGNS is SEQ ID NO: 65.
In a further embodiment, Fe regions can be attached to the E and / or K curls of DART ™ with E curls or K curls. Increase the separation between the Fe regions and the DART ™ VH domain of a DART ™ containing Fe is desirable in 89 cases
WICKED
INSTITUTE MCX1CANO
M THE RRONITY ^ · τ6ί
INDUSTRIAL in which a less separate arrangement of such domains results in decreased interaction between such domains and their binding ligands or otherwise interferes with the assembly of DART ™. Although spacers of any amino acid sequence may be employed, it is preferable to employ spacers that form a-helix coils so that the Fe domain is maximally extended and the Fe domain is projected away from the variable domains. Since the oppositely charged coiled polypeptides described above additionally function to promote heterodimer formation, such molecules are particularly preferred spacers. Such coiled-containing Fc-DART ™ molecules provide benefits similar to those of Fc-DART ™, including improved serum half-life and recruitment of effector function. The E-coiled and K-coiled polypeptides described above are particularly preferred for this purpose. Thus, in a preferred embodiment, the E-coiled Fe-containing DART ™ will have the general sequence: [VL domain] - [GGGSGGGG] - [VH domain] - [(EVAALEK)<sub>4</sub>] —GGG — Fe domain beginning with D234 (Kabat numbering), where VL is the variable light Ig domain of DART ™, GGGSGGGG is SEQ ID NO: 52, VH is the variable heavy Ig domain of DART ™ and (EVAALEK)<sub>4</sub> is SEQ ID NO: 63. Similarly, in a preferred embodiment, the K-coiled Fe-containing DART ™ will have the general sequence: [VL domain] - [GGGSGGGG] - [VH domain] - [(KVAALKE)<sub>4</sub>] - GGG — Fe domain beginning with D234 (Kabat numbering), where VL is the variable light Ig domain of DART ™, GGGSGGGG is SEQ ID NO: 51, VH is the variable heavy Ig domain of DART ™ and (KVAALKE)<sub>4</sub> is SEQ ID NO: 64.
As indicated above, a DART ™ molecule containing coil or a DART ™ molecule containing Fe that contains coil may only contain a single such coil spacer, or it may contain more than one such spacer (for example , two spacers, preferably oppositely charged, of which one is attached to each of the VH domain of DART ™ polypeptides). By binding the Fe region to such spacer molecule (s), the ability to prepare bivalent, tetravalent, etc. versions is enhanced. of Fc-DART ™ molecules by chain change. Thus, Fc-DART ™ molecules can be produced that form monomers or dimers depending on whether the Fe domain is bound to one or both of the DART ™ VH domains.
1. Versatility of DART ™ molecules versus B7-H3
INSTITUTO MEXICANO • E LA INDUSTRIAL PROPERTY
The bispecific DART ™ of the invention can bind simultaneously to two separate and distinct epitopes. In certain embodiments the epitopes are from the same antigen. In other embodiments, the epitopes are from different antigens. In preferred embodiments, at least one epitope binding site is specific for a determinant expressed on an immune effector cell (eg CD3, CD16, CD32, CD64, T cell receptor, etc.) that are expressed on T lymphocytes, lymphocytes natural killer (NK) or other mononuclear cells. In one embodiment, the DART ™ molecule binds to the effector cell determinant and also activates the effector cell. In this regard, the DART ™ molecules of the invention can display Ig-like functionality regardless of whether they further comprise an Fe domain (eg, as tested in any effector function assay known in the art or shown by way of example herein (eg ADCC assay). In certain embodiments the bispecific DART ™ of the invention binds both a cancer antigen on a tumor cell and an effector cell determinant while activating said cell. In alternative embodiments, the bispecific DART ™ or the DART ™ molecule of the invention can inhibit the activation of a target, eg, effector cell, by simultaneously binding, and thus binding together, an activating and inhibiting receptor on the same cell. (eg, binding to both CD32A and CD32B, both BCR and CD32B, or both IgERI and CD32B) as described above (see background section). In a further aspect of this embodiment, bispecific DART ™ can display antiviral properties by simultaneously binding to two neutralizing epitopes on a virus (eg, RSV epitopes; WNV epitopes such as E16 and E53).
two. DART ™ Molecules vs. Universal B7-H3
In one embodiment, the bispecific DART ™ molecules of the invention can be constructed to comprise an epitope-binding domain that specifically binds to B7-H3 and a second epitope-binding domain that specifically binds to a hapten, for example isothiocyanate. fluorescein (also known as fluoroisothiocyanate or FITC). Such a DART ™ serves as a universal adapter ("UDART ™"), which can co-bind B7-H3 with molecules that interact with fluorescein-conjugated binding partners. For example, the FITC-reactive arm of DART ™ can be used to bind to a FITC-labeled antibody that is bound to a target other than B7-H3 involved in intercellular clustering, intercellular recruitment, cell-free recruitment, multiple targets, etc. . The version
<img file="MX345232B_D0067.tif" />
IMPI
ΙΝίΤΠυΤ MBOCANQ
BE LA EROHEDAD industrial chimeric Mouse Fv / Human Fc of the anti-fluorescein mAb, 4420, can be used as a source of CDR domains specific for FITC (Gruber, M. et al. (1994) "Efficient Tumor Cell Lysis
Mediated By A Bispecific Single Chain Antibody Expressed In Escherichia colí ”, J. Immunol.
152(11): 5368-5374).
3. DART ™ Molecules Against Cell Target Specific B7-H3
The bispecific DART ™ molecules of the invention offer unique opportunities to target specific cell types. For example, the bispecific DART ™ or DART ™ molecule can be engineered to comprise a combination of epitope binding sites that recognize a set of antigens unique to a target cell or tissue type. Additionally, when either or both of the individual antigens are fairly common separately in other tissue and / or cell types, low affinity binding domains can be used to construct the DART ™ or the DART ™ molecule. Such low affinity binding domains will not be able to bind to the individual epitope or antigen with sufficient avidity for therapeutic purposes. However, when both epitopes or antigens are present on a single target cell or tissue, the avidity of the DART ™ or the DART ™ molecule for the cell or tissue, relative to a cell or tissue that only expresses one of the antigens, it will be augmented such that said cell or tissue can be effectively targeted by the invention. Such a bispecific molecule can show enhanced binding to one or both of its target antigens in cells that express both of said antigens with respect to a monospecific DART ™ or an antibody with specificity only against one of the antigens.
For example, the B7-H3-specific DART ™ of the present invention can be constructed to comprise a domain that is a binding ligand for natural killer lymphocyte group 2D (NKG2D) receptor. The NKG2D receptor is expressed on all human (and other mammalian) natural killer lymphocytes (Bauer, S. et al. (1999) "Activation OfNK Cells And T Cells By NKG2D, A Receptor For Stress-Inducible MICA", Science 285 (5428): 727729; Jamieson, AM et al. (2002) "The Role Of The NKG2D Immunoreceptor In Immune Cell Activation And Natural Killing", Immunity 17 (1): 19-29) as well as in all CD8 T cells<sup>+ </sup>(Groh, V. et al. (2001) "Costimulation Of CD8af T Cells By NKG2D Via Engagement By MIC Induced On Virus-Infected Cells", Nat. Immunol. 2 (3): 255-260; Jamieson, AM et al. (2002) "The Role Of The NKG2D Immunoreceptor In Immune Cell Activation And Natural Killing", Immunity 17 (1): 19-29). Such binding ligands, and particularly those that are not expressed in cells
IMPI tNsrmrr · Mexican DE LA FMRIDAD INDUSTRIAL
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Normal, include histocompatibility molecule 60 (H60), retinoic acid early inducible gene product 1 (RAE-1), and murine UL16-binding protein-type 1 transcript (MULT1) (Raulet DH (2003) "Roles Of The NKG2D Immunoreceptor And Its Ligands", Nature Rev. Immunol. 3: 781-790; Coudert, JD et al. (2005) "Altered NKG2D Function In NK Cells
Induced By Chronic Exposure To Altered NKG2D Ligand-Expressing Tumor Cells ", Blood 106: 1711-1717). Additional human NKG2D reactive ligands include the polymorphic MHC class I chain-related molecules MICA and MICB (Diefenbach, A. et al. (1999) "Natural Killer Cells: Stress Out, Tum On, Tune In", Curr. Biol. 9 (22): R851-R8533; Bauer, S. et al. (1999) "Activation OfNK Cells And T Cells By NKG2D, A Receptor For Stress10 Inducible MICA", Science 285 (5428): 727-729; Stephens, HA (2001) "MICA And MICB Genes: Can The Enigma Of Their Polimorphism Be Resolved?" Trends Immunol. 22: 378-385. The MICA sequence is SEQ ID NO: 66:
MGLGPVFLLL AGIFPFAPPG AAAEPHSLRY NLTVLSWDGS VQSGFLTEVH
LDGQPFLRCD RQKCRAKPQG QWAEDVLGNK TWDRETRDLT GNGKDLRMTL
AHIKDQKEGL HSLQEIRVCE IHEDNSTRSS QHFYYDGELF LSQNLETKEW
TMPQSSRAQT LAMNVRNFLK EDAMKTKTHY HAMHADCLQE LRRYLKSGVV
LRRTVPPMVN VTRSEASEGN ITVTCRASGF YPWNITLSWR QDGVSLSHDT
QQWGDVLPDG NGTYQTWVAT RICQGEEQRF TCYMEHSGNH STHPVPSGKV
LVLQSHWQTF HVSAVAAAAI FVIIIFYVRC CKKKTSAAEG PELVSLQVLD
QHPVGTSDHR DATQLGFQPL MSDLGSTGST EGA
The sequence of MICB is SEQ ID NO: 67:
PHSLRYNLMV LSQDGSVQSG FLAEGHLDGQ PFLRYDRQKR RAKPQGQWAE
DVLGAKTWDT ETEDLTENGQ DLRRTLTHIK DQKGGLHSLQ EIRVCEIHED
SSTRGSRHFY YDGELFLSQN LETQESTVPQ SSRAQTLAMN VTNFWKEDAM
KTKTHYRAMQ ADCLQKLQLP PMVNVICSEV SEGNITVTCR ASSFYPRNIT
LTWRQDGVSL SHNTQQWGDV LPDGNGTYQT WVATRIRQGE EQRFTCYMEH
SGNHGTHPVP SGKALVLQSQ RTDFPYVSAA MPCFVIIIIL CVPCCKKKTS
AAEGP
Alternatively, the DART ™ molecules of the present invention can be constructed to comprise a domain that is a binding ligand for the T cell receptor ("TCR") or for CD3 (the T cell co-receptor). TCR is expressed natively by CD4 + or CD8 + T cells, and enables such cells to recognize antigenic peptides that are bound and presented by MHC class I or class II proteins of antigen presenting cells. Recognition of a pMHC (peptide-MHC) complex by a TCR initiates the propagation of a cellular immune response leading to cytokine production and antigen-presenting cell lysis (see, eg, Armstrong, KM et al. (2008) "Conformational Changes And
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Flexibility In T-Cell Receptor Recognition Of Peptide-MHC Complexes, Biochem. J. 415 (Pt 2): 183-196; Willemsen, R. (2008) "Selection Of Human Antibody Fragments Directed Against Tumor T-Cell Epitopes For Adoptive T-Cell Therapy, Cytometry A. 73 (11): 1093-1099; Beier, KC et al. (2007) “Master Switches Of T-Cell Activation And Differentiation, Eur. Respir. J. 29: 804-812; Mallone, R. et al. (2005) "Targeting T Lymphocytes For Immune Monitoring And Intervention In Autoimmune Diabetes, Am. J. Ther. 12 (6): 534-550). CD3 is the receptor that binds to TCR (Thomas, S. et al. (2010) “Molecular Immunology Lessons From Therapeutic T-Cell Receptor Gene Transfer, Immunology 129 (2): 170-177; Guy, CS et al. ( 2009) "Organization Of Proximal Signal Initiation At The TCR: CD3 Complex, Immunol. Rev. 232 (1): 7-21; St. Clair, EW (Epub 2009 Oct 12)" Novel Targeted Therapies For Autoimmunity, Curr. Opin. Immunol. 21 (6): 648-657; Baeuerle, PA et al. (Epub 2009 Jun 9) “Bispecific T-Cell Engaging Antibodies For Cancer Therapy, Cancer Res. 69 (12): 4941-4944; Smith-Garvin, JE et al. (2009) "T Cell Activation, Annu. Rev. Immunol. 27: 591-619; Renders, L. et al. (2003) "Engineered CD3 Antibodies For Immunosuppression, Clin. Exp. Immunol. 133 (3): 307-309).
Constructing such DART ™ molecules to further comprise at least one epitope-binding domain that can bind, for example, to a receptor present on the surface of a target cell, such DART ™ molecules will be DART ™ molecules and can therefore bind to target cells and thus cause the target cells to present the binding ligand for the natural killer lymphocyte group 2D receptor (NKG2D) or the TCR (which is present in the target cell bound DART ™) (see, for example, Germain, C. et al. (2008) “Redirecting NK Cells Mediated Tumor Cell Lysis By A New Recombinant Bifunctional Protein, Prot. Engineer. Design Selection 21 ( 11): 665-672). Such DART ™ can be used to redirect any desired target cell in a cell that is a target of NK cell mediated cell lysis or T cell mediated cytotoxicity. In one embodiment, the epitope-binding domain of DART ™ that can bind to a receptor present on the surface of a target cell is an epitope that binds to a tumor-associated antigen such that such cancer cells are redirected into substrates to NK cell mediated lysis or T cell mediated cytotoxicity. Of particular interest is a tumor associated antigen which is a breast cancer antigen, an ovarian cancer antigen, a prostate cancer antigen, a cervical cancer antigen, a pancreatic carcinoma antigen, a cancer antigen lung, a bladder cancer antigen, a colon cancer antigen, a testicular cancer antigen, a glioblastoma cancer antigen, an antigen associated with a malignant B-cell tumor,
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FROM INDUSTRIAL PROPERTY an antigen associated with multiple myeloma, an antigen associated with non-Hodgkin's lymphoma, or an antigen associated with chronic lymphocytic leukemia.
Suitable tumor associated antigens for such use include A33 (a colorectal carcinoma antigen; Almqvist, Y. 2006, Nucí Med Biol. Nov; 33 (8): 991-998); B1 (Egloff, AM et al. 2006, Cancer Res. 66 (l): 6-9); BAGE (Bodey, B. 2002 Expert Opin Biol Ther. 2 (6): 577-84); beta-catenin (Prange W. et al. 2003 J Pathol. 201 (2): 250-9); CA125 (Bast, RC Jr. et al. 2005 Int J Gynecol Cancer 15 Suppl 3: 274-81); CD5 (Calin, GA et al. 2006 Semin Oncol. 33 (2): 167-73; CD19 (Troussard, X. et al. 1998 Hematol Cell Ther. 40 (4): 139-48); CD20 (Tilomas, DA et al. 2006 Hematol Oncol Clin North Am. 20 (5): 1125-36); CD22 (Kreitman, RJ 2006 AAPS J. 18; 8 (3): E532-51); CD23 (Rosati, S. et al. 2005 Curr Top Microbiol Immunol. 5; 294: 91-107); CD25 (Troussard, X. et al. 1998 Hematol Cell Ther. 40 (4): 139-48); CD27 (Bataille, R. 2006 Haematologica 91 (9): 1234-40); CD28 (Bataille, R. 2006 Haematologica 91 (9): 1234-40); CD36 (Ge, Y. 2005 Lab Hematol. 11 (1): 31-7); CD40 / CD154 (Messmer, D. et al. 2005 Ann N And Acad Sci. 1062: 51-60); CD45 (Jurcic, JG 2005 Curr Oncol Rep. 7 (5): 339-46); CD56 (Bataille, R. 2006 Haematologica 91 (9): 1234-40); CD79a / CD79b (Troussard, X. et al. 1998 Hematol Cell Ther. 40 (4): 139-48; Chu, PG et al. 2001 Appl Immunohistochem Mol Morphol. 9 (2): 97-106); CD103 (Troussard, X. et al. 1998 Hematol Cell Ther. 40 (4): 139-48); CDK4 (Lee, YM et al. 2006 Cell Cycle 5 (18): 2110-4); CEA (carcinoembryonic antigen; Mathelin, C. 2006 Gynecol Obstet Fértil. 34 (7-8): 638-46; Tellez-Avila, FI et al. 2005 RevInvest Clin. 57 (6): 814-9); CTLA4 (Peggs, KS et al. 2006 Curr Opin Immunol. 18 (2): 206-13); EGF-R (epidermal growth factor receptor; Adenis, A. et al. 2003 Bull Cancer. 90 Spec No: S228-32); Erb (ErbBl; ErbB3; ErbB4; Zhou, H. et al. 2002 Oncogene 21 (57): 8732-40; Rimon, E. et al. 2004 Int J Oncol. 24 (5): 1325-38); GAGE (GAGE-1; GAGE-2; Akcakanat, A. et al. 2006 Int J Cancer. 118 (1): 1238); GD2 / GD3 / GM2 (Livingston, PO et al. 2005 Cancer Immunol Immunother. 54 (10): 1018-25); gplOO (Lotem, M. et al. 2006 JImmunother. 29 (6): 616-27); HER-2 / neu (Kumar, Pal S et al. 2006 Semin Oncol. 33 (4): 386-91); Human papillomavirus E6 / Human papillomavirus E7 (DiMaio, D. et al. 2006 Adv Virus Res. 66: 125-59; KSA (17-l<sup>to</sup>) (Ragupathi, G. 2005 Cancer Treat Res. 123: 157-80); MAGE (MAGE-1; MAGE-3; (Bodey, B. 2002 Expert Opin Biol Ther. 2 (6): 57784); MART (Kounalakis, N. et al. 2005 Curr Oncol Rep. 7 (5): 377- 82; MUC-1 (Mathelin, C. 2006 Gynecol Obstet Fertile. 34 (7-8): 638-46); MUM-1 (Castelli, C. et al. 2000 J Cell Physiol. 182 (3): 323- 31); N-acetylglucosaminyltransferase (Dennis, JW 1999 Biochim Biophys Acta. 6; 1473 (l): 21-34); pl5 (Gil, J. et al. 2006 Nat Rev Mol Cell Biol. 7 (9): 667- 77); PSA (antigen
Mexican IMPI usTmrro DE LA FROFIEDAD INDUSTRIAL specific for prostate; Cracco, CM et al. 2005 Minerva Urol Nefrol. 57 (4): 301-11); PSMA (Ragupathi, G. 2005 Cancer Treat Res. 123: 157-80); sTn (Holmberg, LA. 2001 Expert Opin Biol Ther. 1 (5): 881-91); TNF-receptor (TNF-α receptor, TNF-β receptor; or TNF-γ receptor; van Horssen, R. et al. 2006 Oncologist. 11 (4): 397-408; Gardnerova, M. et al. 2000 Curr Drug Targets. L (4): 327-64); or VEGF receptor (O'Dwyer. PJ 2006 Oncologist. 11 (9): 992-8).
Additional tumor associated antigens for such use (and publications specifically disclosing antibodies reactive for such antigens) include ADAM-9 (US Patent Publication No. 2006/0172350; PCT Publication No. WO 06/084075); ALCAM (PCT Publication No. WO 03/093443); Carboxypeptidase M (US Patent Publication No. 2006/0166291); CD46 (US Patent No. 7,148,038; PCT Publication No. WO 03/032814); cytokeratin 8 (PCT Publication No. WO 03/024191); ephrin receptors (and in particular EphA2 (US Patent No. 7,569,672; PCT Publication No. WO 06/084226); Integrin alpha-V-beta-6 (PCT Publication No. WO 03/087340); JAM -3 (PCT Publication No. WO 06/084078); KID3 (PCT Publication No. WO 05/028498); KID31 (PCT Publication No. WO 06/076584); LUCA-2 (US Patent Publication No. 2006/0172349; PCT Publication No. WO 06/083852); Oncostatin M (Oncostatin Receptor beta) (US Patent No. 7,572,896; PCT Publication No. WO 06/084092); PIPA (US Patent No. 7,405,061; PCT Publication No. WO 04/043239); ROR1 (US Patent No. 5,843,749); and the transferrin receptor (US Patent No. 7,572,895; PCT Publication No. WO 05/121179).
Also of interest are specific antigens for particular infectious agents, eg, viral agents including, but not limited to, human immunodeficiency virus (HIV), hepatitis B virus (HBV), influenza, human papillomavirus (HPV), fever. foot and mouth disease (coxsackie virus), rabies virus, herpes simplex virus (HSV), and causative agents of gastroenteritis, including rotavirus, adenovirus, calicivirus, astrovirus, and Norwalk virus; Bacterial agents including, but not limited to, E. coli, Salmonella thyphimurium, Pseudomonas aeruginosa, Vibrio cholerae, Neisseria gonorrhoeae, Helicobacter pylori, Hemophilus influenzae, Shigella dysenteriae, Staphylococcus aureus, Mycobacterium parasiticum agents, and Streptococcus pneumoniae such as Pneumiaridiascus and Streptococci agents .
In some embodiments, molecules of the invention are engineered to comprise an altered glycosylation pattern or an altered glycoform relative to the comparable part of the template molecule. Engineered Glycoforms Can Help
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9F LA PROBIDAD OtaJS & O industrial for a variety of purposes, including, but not limited to, enhancing the effector function. Engineered glycoforms can be generated by any method known to one of ordinary skill in the art, for example using engineered or variant expression strains, by co-expression with one or more enzymes, for example DI N-acetylglucosaminyltransferase III (GnTIll), by expression of a DART ™ of the invention in various organisms or cell lines of various organisms, or by modification of carbohydrate (s) after the DART ™ has been expressed and purified. Methods for generating engineered glycoforms are known in the art and include, but are not limited to, those described in Umana et al. (1999) "Engineered Glycoforms Of An Antineuroblastoma IgGl With Optimized Antibody-Dependent Cellular Cytotoxic Activity", Nat. Biotechnol 17: 176-180; Davies et al. (2001) "Expression Of GnTIII In A Recombinant Anti-CD20 CHO Production Cell Line: Expression Of Antibodies With Altered Glycoforms Leads To An Increase In Adcc Through Higher Affinity For Fe Gamma RIII, Biotechnol Bioeng 74: 288-294; Shields et al. (2002) "Lack Of Fucose On Human IgGl N-Linked Oligosaccharide Improves Binding To Human Fcgamma RUI And Antibody-Dependent Cellular Toxicity, J Biol Chem 277: 26733-26740; Shinkawa et al. (2003) "The Absence Of Fucose But Not The Presence Of Galactose Or Bisecting N-Acetylglucosamine Of Human IgGl Complex-Type Oligosaccharides Shows The Critical Role Of Enhancing Antibody-Dependent Cellular Cytotoxicity", J Biol Chem 278: 3466-3473) US documents 6,602,684; USSN 10 / 277,370; USSN 10 / 113,929; PCT WO 00 / 61739A1; PCT WO 01 / 292246A1; PCT WO 02 / 311140A1; PCT WO 02 / 30954A1; Potillegent ™ technology (Biowa, Inc. Princeton, NJ); GlycoMAb ™ glycosylation engineering technology (GLYCART biotechnology AG, Zurich, Switzerland); each of which is incorporated herein by reference in its entirety. See, for example, WO 00061739; EA01229125; US 20030115614; Okazaki et al. (2004) "Fucose Depletion From Human IgGl Oligosaccharide Enhances Binding Enthalpy And Association Rate Between IgGl And FcGammaRIIIA", JMB, 336: 1239-49 each of which is incorporated herein by reference in its entirety.
The invention further encompasses the incorporation of unnatural amino acids to generate the DART ™ of the invention. Such methods are known to those of skill in the art such as those that use natural biosynthetic machinery to allow incorporation of unnatural amino acids into proteins, see, for example, Wang et al. (2002) "Expanding The Genetic Code", Chem. Comm. 1: 1-11; Wang et al. (2001) "Expanding The Genetic Code Of Escherichia coli", Science, 292: 498-500; van Hest et al. (2001) "Protein-Based Materials, Toward A New Level Of
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Structural Control ”, Chem. Comm. 19: 1897-1904, each of which is incorporated herein by reference in its entirety. Alternative strategies focus on the enzymes responsible for aminoacyl-tRNA biosynthesis, see, for example, Tang et al. (2001) "Biosynthesis Of A Highly Stable Coiled-Coil Protein Containing Hexafluoroleucine In An Engineered Bacterial Host", J. Am. Chem. Soc. 123 (44): 11089-11090; Kiick et al. (2001) "Identification Of An Expanded Set Of Translationally Active Methionine Analogues In Escherichia coli, FEBS Lett. 502 (1-2): 25-30; each of which is incorporated herein by reference in its entirety. In some embodiments, the invention encompasses methods of modifying a VL, VH, or Fe domain of a molecule of the invention by adding or removing a glycosylation site. Methods for modifying the carbohydrate of proteins are well known in the art and are encompassed within the invention, see, for example, US Patent No. 6,218,149; EP 0 359 096 Bl; US Publication No. US 2002/0028486; WO 03/035835; US Publication No. 2003/0115614; US Patent No. 6,218,149; US Patent No. 6,472,511; all of which are incorporated herein by reference in their entirety.
VIII. Methods of using B7-H3 modulators and anti-B7-H3 antibodies for therapeutic purposes
Monoclonal antibodies to B7-H3 can be used for therapeutic purposes in individuals with cancer or other diseases. Anti-B7-H3 antibody therapy can involve complex formation both in vitro and in vivo as described above. In one embodiment, the anti-B7-H3 monoclonal antibody can bind to, and reduce the proliferation of, cancer cells. The antibody is understood to be administered at a concentration that promotes binding under physiological conditions (eg, in vivo). In another embodiment, monoclonal antibodies to B7-H3 can be used for immunotherapy targeting cancer cells from different tissues such as colon, lung, breast, prostate, ovary, pancreas, kidney, and other types of cancer such as sarcoma. In another embodiment, the anti-B7-H3 monoclonal antibody can only bind to, and reduce cell division in, the cancer cell. In another embodiment, the anti-B7-H3 monoclonal antibody can bind to cancer cells and delay the development of metastasis. In yet another embodiment, an individual with cancer is administered a palliative anti-B7-H3 antibody treatment. Palliative treatment of an individual with cancer involves treating or reducing the adverse symptoms of the disease, or iatrogenic symptoms resulting from other treatments given for the disease without directly affecting the progression of the disease.
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Dt THE INDUSTRIAL PROPERTY cancer. This includes treatments for pain relief, nutritional support, sexual problems, psychological stress, depression, fatigue, psychiatric disorders, nausea, vomiting, etc.
In such situations, the anti-B7-H3 antibody can be administered with agents that enhance or direct the individual's own immune response, such as an agent that enhances ADCC.
In yet another embodiment, anti-B7-H3 antibody can be conjugated or associated with a radioactive molecule, toxin (eg, calicheamicin), chemotherapeutic molecule, liposomes, or other vesicles containing chemotherapeutic compounds and administered to an individual in need of such treatment to target these compounds to the cancer cell that contains the antigen recognized by the antibody and therefore kill cancer or diseased cells. Without being limited to any particular theory, the anti-B7-H3 antibody is internalized by the cell bearing B7-H3 on its surface, thereby supplying the conjugated moiety to the cell to induce the therapeutic effect. In yet another embodiment, the antibody may be used as adjunctive therapy at the time of surgical removal of an antigen-expressing cancer in order to delay the development of metastasis. The antibody can also be administered before surgery (neoadjuvant therapy) in an individual with a tumor that expresses the antigen in order to reduce the size of the tumor and thus allow or simplify surgery, preserve tissue during surgery, and / or reduce resulting disfigurement.
Cell cycle dosing is contemplated in the practice of this invention. In such embodiments, a chemotherapeutic agent is used to synchronize the cell cycle of the tumor or other target diseased cells to a predetermined phase. Subsequently, the administration of the anti-B7-H3 antibody of this invention is performed (alone or with an additional therapeutic moiety). In alternative embodiments, an anti-B7-H3 antibody is used to synchronize the cell cycle and reduce cell division prior to administration of a second cycle of treatment; the second cycle may be the administration of an anti-B7-H3 antibody and / or an additional therapeutic moiety.
Chemotherapeutic agents include radioactive molecules, toxins, also referred to as cytotoxins or cytotoxic agents, which include any agent that is harmful to the viability of cancer cells, agents, and liposomes or other vesicles containing chemotherapeutic compounds. Examples of suitable chemotherapeutic agents include, but are not limited to, 1-dehydrotestosterone, 5-fluorouracil-decarbazine, 6-mercaptopurine, 699
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thioguamna, actinomycin D, adnamycin, aldesleucine, alkylating agents, allopurinol sodium, altretamine, amifostine, anastrozole, anthramycin (AMC)), antimitotic agents, cisdichlorodiamine-platinum (II) (DDP) cisplatin), diaminodichloroplatin, antibiotics asparaginase, live BCG (intravesical), betamethasone sodium phosphate and betamethasone acetate, bicalutamide, bleomycin sulfate, busulfan, calcium leucouorin, calicheamicin, capecitabine, Carboplatin, Lomustine (CCNU), Carmustine (BSNU), Chlorambucil, Cisplatin, Cladribine, Colchicine, Conjugated Estrogens, Cyclophosphamide, Cyclotosphamide, Cytarabine, Cytarabine, Cytochalasin B, Cytoxane, Dacarbazine, Dactinomycin, Cl-Dactinomycin, Actinomycin (formerly Dactinomycin) of daunorucbicin, denileucine diftitox, dexrazoxane, dibromomannitol, dihydroxyanthrazinedione, docetaxel, dolasetronmesilate, doxorubicin HCL, dronabinol, L-asparaginase from E. coli, emetine, epoetin alfa, Erwinia L-asparaginase, esterified estrogens, estradiol, estramustine sodium phosphate, ethidium bromide, ethinyl estradiol, etidronate, etoposide, citrovorum factor, etoposide phosphate, filgrastim, fluconauridine, fluconauridine fludarabine, fluorouracil, flutamide, folinic acid, gemcitabine HCL, glucocorticoids, goserelin acetate, gramicidin D, granisetron HCL, hydroxyurea, idarubicin HCL, ifosfamide, interferon alfa-2b, irinotecan HCL, Letrozole, Leucovorin Calcium, Leuprolide Acetate, Levamisole HCL, Lidocaine, Lomustine, Maytansinoid, Mechlorethamine HCL, Medroxyprogesterone Acetate, Megestrol Acetate, Melphalan HCL, Mercaptipurin, Mesna, Methotrexomycin, Methyl, Mithotosterone, Mithhotrexomycin, Methyl, Mithotosterone , octreotide acetate, ondansetron HCL, paclitaxel, pamidronate disodium, pentostatin, pilocarpine HCL, plimycin, polifeprosan 20 (with carmustine implant), porfimer sodium, procaine, procarbazine HCL, propranolol, rituximab, sargramostima, streptozotocin, tamoxifen, taxol, teniposide, tenoposide, testolactone, tetracaine, thioepa-chlorambucil, thioguanine, thiotepa, topotecan HCL, treuzrate, toumabifen, sulphidene, vinoblastine vincristine sulfate and vinorelbine tartrate.
In a preferred embodiment, the cytotoxin is especially effective in dividing or rapidly dividing cells, such that non-dividing cells are relatively spared from toxic effects.
The antibodies of the invention can be internalized into the diseased or carcinoma cells to which they bind and are therefore particularly useful for therapeutic applications, for example, supplying into the cells toxins that need to be internalized for their activity.
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industrial> »*. 25 ** ^ adverse. Examples of such toxins include, but are not limited to. sanorina. calicheamicin, ..... auristatin and maytansinoid.
The antibodies or polypeptides of the invention can be associated (including conjugated or attached) with a radioactive molecule, a toxin, or other therapeutic agents, or with liposomes or other vesicles that contain therapeutic agents in a covalent or non-covalent manner, directly or indirectly. . The antibody can bind to the radioactive molecule, the toxin, or the chemotherapeutic molecule at any location along the antibody as long as the antibody can bind to its B7-H3 target.
A toxin or chemotherapeutic agent can be administered simultaneously (before, after, or during administration), or coupled (eg, covalently linked) with a suitable monoclonal antibody either directly or indirectly (eg, via a linking group, or, alternatively, by a binding molecule with appropriate binding sites, such as a platform molecule as described in US Patent No. 5,552,391). The toxin and chemotherapeutic agent of the present invention can be directly coupled to particular targeting proteins using methods known in the art. For example, a direct reaction between an agent and an antibody is possible when each has a substituent that can react with the other. For example, a nucleophilic group, such as an amino or sulfhydryl group, in one can react with a carbonyl-containing group, such as an anhydride or acid halide, or with an alkyl group containing a good leaving group (for example, one halide) in the other.
Antibodies or polypeptides can also be linked to a chemotherapeutic agent via a microcarrier. The term "microcarrier" refers to a biodegradable or a non-biodegradable particle that is insoluble in water and that is less than about 150 µm, 120 pm, or 100 pin in size, more commonly less than about 50-60 pm, preferably less than about 10, 5, 2.5, 2, or 1.5 pm. Microcarriers include "nanocarriers", which are microcarriers that are less than about 1 pm in size, preferably less than about 500 nm. Such particles are known in the art. Solid phase microcarriers can be particles formed from biocompatible naturally occurring polymers, synthetic polymers, or synthetic copolymers, which can include or exclude microcarriers formed from agarose or cross-linked agarose, as well as other biodegradable materials known in the art. technique. Microcarriers can form
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IMPI •• “ira · lili tNrrrruTo mbkicano DI LA RRORIDAD INDUSTRIAL solid phase biodegradable from polymers that are degradable (eg poly (lactic acid), poly (glycolic acid) and copolymers thereof) or erodible (eg , polyorthoesters, such as 3,9-diethylidene-2,4,8,10-tetraoxaspiro [5.5] undecane (DETOSU) or polyanhydrides, such as sebacic acid polyanhydrides) under mammalian physiological conditions. Microcarriers can also be in liquid phase (for example, oil-based or lipid-based), such as liposomes, iscomas (immunostimulating complexes, which are stable complexes of cholesterol, and phospholipids, active adjuvant saponin) without antigen, or drops or nuclei found in oil-in-water or water-in-oil emulsions, provided the liquid phase microcarriers are biodegradable. Biodegradable liquid phase microcarriers typically incorporate a biodegradable oil, several of which are known in the art, including squalene and vegetable oils. Microcarriers are typically spherical in shape, but microcarriers that deviate from spherical shape (eg, ellipsoidal, rod-shaped, etc.) are also acceptable. Due to their insoluble nature (with respect to water), microcarriers can be separated by filtration from water and water-based (aqueous) solutions.
The antibody or polypeptide conjugates of the present invention can include a bifunctional linker that contains both a group that can be coupled to a toxic agent or chemotherapeutic agent and a group that can be coupled to the antibody. A linker can function as a spacer to separate an antibody from an agent in order to avoid interference with binding capabilities. A linker can be cleavable or non-cleavable. A linker can also serve to increase the chemical reactivity of a substituent on an agent or an antibody, and thus increase the coupling efficiency. Increased chemical reactivity can also facilitate the use of agents, or functional groups on agents, that would not otherwise be possible. The bifunctional linker can be coupled to the antibody by means that are known in the art. For example, a linker containing an active ester moiety, such as an N-hydroxysuccinimide ester, can be used to couple to lysine residues on the antibody via an amide bond. In another example, a linker containing a nucleophilic hydrazine or amine residue can be coupled to aldehyde groups produced by glycolytic oxidation of antibody carbohydrate residues. In addition to these direct coupling methods, the linker can be indirectly coupled to the antibody by means of an intermediate carrier such as an aminodextran. In these embodiments the modified linkage is via lysine, carbohydrate or an intermediate carrier. In one embodiment, the linker selectively attaches from the site to
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free thiol residues in the protein. It is well known in the art that eme moieties are suitable for selective coupling to thiol groups in proteins. Examples include disulfide compounds, α-halocarbonyl and α-halocarboxyl compounds, and maleimides. When a nucleophilic amine function is present in the same molecule as a & # 945; -halo-carbonyl or carboxyl group there is the potential for cyclization to occur by intramolecular alkylation of the amine. Methods of avoiding this problem are known to one of ordinary skill in the art, for example by preparing molecules in which the amine and & # 945; -halo functions are separated by inflexible, such as aryl groups or trans-alkenes, which cause them to stereochemically disfavor unwanted cyclization. See, for example, US Patent No. 6,441,163 for the preparation of maytansinoid-antibody conjugates via a disulfide moiety.
One of the cleavable linkers that can be used for the preparation of antibody-drug conjugates is an acid-labile linker based on cis-aconitic acid that takes advantage of the acidic environment of different intracellular compartments such as endosomes found during receptor-mediated endocytosis. and lysosomes. See, for example, Shen, WC et al. (1981) ("cis-Aconityl Spacer Between Daunomycin And Macromolecular Carriers: A Model Of pH-Sensitive Linkage Releasing Drug From A Lysosomotropic Conjugate", Biochem. Biophys. Res. Comtnun. 102: 1048-1054 (1981)) for the preparation of conjugates of daunorubicin with macromolecular carriers; Yang et al. (1988) ("Pharmacokinetics And Mechanism Of Action Of A Doxorubicin-Monoclonal Antibody 9,2.27 Conjugate Directed To A Human Melanoma Proteoglycan", J. Nati. Cañe. Inst. 80: 1154-1159) for the preparation of conjugates of daunorubicin with an anti-melanoma antibody; Dillman et al. (1988) ("Superiority OfAn Acid-Labile Daunorubicin-Monoclonal Antibody Immunoconjugate Compared To Free Drug", Cancer Res. 48: 6097-6102) to use an acid-labile linker in a similar manner to prepare conjugates of daunorubicin with an antibody anti-T cells; and Trouet et al. (1982) "A Covalent Linkage Between Daunorubicin And Proteins That Is Stable In Serum And Reversible By Lysosomal Hydrolases, As Required For A Lysosomotropic DrugCarrier Conjugate: In Vitro And In Vivo Studies", Proc. Nati. Acad. Sci. (USA) 79: 626-629) to bind daunorubicin to an antibody via a peptide spacer arm.
An antibody (or polypeptide) of this invention can be conjugated (attached) to a radioactive molecule or toxin by any method known in the art. For an evaluation of methods to radiolabel antibody (see, Cancer Therapy with Monoclonal 103
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Antibodies, DM Goldenberg (Ed.) CRC Press, Boca Raton, 1995). Suitable toxins include taxanes, maytansinoids, auristatins (eg, monomethyl auristatin (MMAE), monomethyl auristatin F (MMAF), auristatin E (AE), etc.) (such as those disclosed in US Pat.<sup>you</sup> 5,208,020; 5,416,064; 6,333,410; 6,340,701; 6,372,738; 6,436,931; 6,441,163; 6,596,757; 7,276,497; 7,585,857 or 7,851,432), calicheamicin, anthracyclines (eg, doxorubicin), CC-1065 analog, docetaxel, cathepsin B or E; ricin, gelonin, Pseudomonas endotoxin, diphtheria toxin, and RNase; tiuxetane or toxic radioisotope (such as<sup>90</sup>Y; <sup>131</sup>I, <sup>l77</sup>Lu, <sup>l86</sup>Re, <sup>l88</sup>Re, <sup>2tl</sup>At, <sup>212</sup>Bi, <sup>213</sup>Bi, <sup>225</sup>Ac, etc.).
Alternatively, an antibody can be conjugated to a second antibody to form a heteroconjugate of antibodies as described in US Patent No. 4,676,980. The formation of cross-linked antibodies can direct the immune system to specific types of cells, for example, cancer or diseased cells that express B7-H3.
This invention also provides methods of delaying the development of metastasis in an individual with cancer (including, but not limited to, prostate, lung, or kidney cancer) using an anti-B7-H3 antibody or other embodiments that bind to B7- H3 in combination with a chemotherapeutic agent, or in combination with a chemotherapeutic agent. In some embodiments, the antibody is a humanized or chimeric form of a non-human anti-B7-H3 antibody.
In yet another embodiment, the antibody may be used as adjunctive therapy at the time of surgical removal of an antigen-expressing cancer in order to delay the development of metastasis. The antibody or antibody associated with a chemotherapeutic agent can also be administered before surgery (neoadjuvant therapy) in an individual with a tumor that expresses the antigen in order to reduce the size of the tumor and therefore allow or simplify surgery, preserve tissue during surgery and / or reduce the resulting disfigurement.
In yet another embodiment, any of the B7-H3 binding compositions described herein can bind to cancer cells that express B7-H3 and induce an active immune response against the cancer cells that express B7-H3. In some cases, the active immune response can cause cancer cell death (for example, antibody binding to cancer cells that induces apoptotic cell death), or inhibit the growth (for example, blocking cell cycle progression) of cells. cancer cells. In other cases, any of the novel antibodies described herein can bind to cancer cells and antibody-dependent cellular cytotoxicity (ADCC) can 104
IMPI tHrrrnjT · miwcano M LA FROÑWA »industrial kill cancer cells to which the anti-B7-H3 antibody binds. Accordingly, the invention provides methods of stimulating an immune response comprising administering any of the compositions described herein.
In some cases, antibody binding may also activate both cellular and humoral immune responses and recruit more NK cells or increased production of cytokines (eg, IL-2, IFN-gamma, IL-12, TNF-alpha, TNF -beta, etc.) that additionally activate an individual's immune system to kill cancer cells. In yet another embodiment, anti-B7-H3 antibodies can bind cancer cells, and macrophages or other phagocytic cells can opsonize cancer cells.
Various anti-B7-H3 antibody formulations or fragments thereof can be used for administration. In some embodiments, pure anti-B7-H3 antibodies or fragments thereof can be administered. In addition to the pharmacologically active agent, The compositions of the present invention may contain suitable pharmaceutically acceptable carriers comprising excipients and auxiliary components that are well known in the art and that are relatively inert substances that facilitate the administration of a pharmacologically effective substance or that facilitate the processing of the active compounds. to obtain preparations that can be used pharmaceutically to be delivered to the site of action. For example, an excipient can give shape or consistency, or act as a diluent. Suitable excipients include, but are not limited to, stabilizing agents, wetting agents and emulsifiers, salts for varying osmolality, encapsulating agents, buffers, and skin penetration enhancers.
Formulations suitable for parenteral administration include aqueous solutions of the active compounds in water soluble form, eg, water soluble salts. In addition, suspensions of the active compounds may be administered as appropriate for injection suspensions in oil. Suitable lipophilic vehicles or solvents include fatty oils, eg, sesame oil, or synthetic fatty acid esters, eg, ethyl oleate or triglycerides. Aqueous injection suspensions may contain substances that increase the viscosity of the suspension and include, for example, sodium carboxymethyl cellulose, sorbitol and / or dextran. Optionally, the suspension can also contain stabilizers.
Liposomes can also be used to encapasulate the agent for delivery into the cell.
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The pharmaceutical formulation for systemic administration according to the invention can be formulated for enteral, parenteral or topical administration. In fact, the three types of formulation can be used simultaneously to achieve a systemic administration of the active principle. Excipients as well as formulations for parenteral and non-parenteral drug administration are discussed in Reminoton: The Science And Practice Of Pharmacy, 21<sup>to</sup> edition, Lippincott Williams & Wilkins Publishing (2005). Formulations suitable for oral administration include hard or soft gelatin capsules, lozenges, tablets, including coated tablets, elixirs, suspensions, syrups or inhalations, and controlled release forms thereof. Generally, these agents are formulated for administration by injection (eg, intraperitoneally, intravenously, subcutaneously, intramuscularly, etc.), although other forms of administration (eg, oral, mucosa, etc.) may also be used. Accordingly, anti-B7-H3 antibodies are preferably combined with pharmaceutically acceptable carriers such as saline, Ringer's solution, dextrose solution, and the like.
The particular dosage regimen, ie, dose, time, and repetition, will depend on the particular individual and the individual's medical history. Generally, a dose of at least about 100 pg / kg of body weight is administered, more preferably at least about 250 pg / kg of body weight, even more preferably at least about 750 pg / kg of body weight, even more preferably at least about 750 pg / kg of body weight. about 3 mg / kg of body weight, even more preferably at least about 5 mg / kg of body weight, even more preferably at least about 10 mg / kg of body weight.
Empirical considerations, such as half-life, will generally assist in determining the dosage. Antibodies, which are compatible with the human immune system, such as humanized antibodies or fully human antibodies, can be used to prolong the half-life of the antibody and to prevent the host immune system from attacking the antibody. The frequency of administration can be determined and adjusted throughout the course of therapy, and is based on reducing the number of cancer cells, maintaining the reduction in cancer cells, reducing the proliferation of cancer cells, or delaying the development of metastasis. Alternatively, sustained sustained release formulations of anti-B7-H3 antibodies may be appropriate. Various formulations and devices are known in the art to achieve sustained release.
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In one embodiment, dosages for anti-B7-H3 antibodies can be determined empirically in individuals administered one or more administrations. Individuals are administered incremental dosages of an anti-B7-H3 antibody. To assess the efficacy of anti-B7-H3 antibodies, a specific cancer disease state marker can be monitored. These include direct measurements of tumor size by palpation or visual observation; indirect measurement of tumor size by X-ray or other imaging techniques; an improvement as assessed by direct tumor biopsy and microscopic examination of the tumor sample; measurement of a surrogate tumor marker (eg, PSA for prostate cancer), a reduction in pain, or paralysis; improvement of disability in speech, vision, breathing or other associated with the tumor; increased appetite; or an increase in quality of life as measured by accepted evidence or prolongation of survival. It will be apparent to one of skill in the art that the dosage will vary depending on the individual, the type of cancer, the stage of the cancer, whether the cancer has begun to metastasize to another location in the individual, and the prior and concurrent treatments being used.
Other formulations include suitable delivery forms known in the art including, but not limited to, carriers such as liposomes. See, for example, Mahato et al. (1997) “Cationic Lipid-Based Gene Delivery Systems: Pharmaceutical Perspectives, Pharm. Res. 14: 853-859. Liposomal preparations include, but are not limited to, cytofectins, multilamellar vesicles, and unilamellar vesicles.
In some embodiments, more than one antibody may be present. Antibodies can be monoclonal or polyclonal. Such compositions can contain at least one, at least two, at least three, at least four, at least five different antibodies that are reactive against carcinomas, adenocarcinomas, sarcomas or adenosarcomas. The anti-B7-H3 antibody can be mixed with one or more reactive antibodies against carcinomas, adenocarcinomas, sarcomas or adenosarcomas in organs including, but not limited to, ovary, breast, lung, prostate, colon, kidney, skin, thyroid, bone , upper digestive tract and pancreas. In one embodiment, a mixture of different anti-B7-H3 antibodies is used. A mixture of antibodies, as they are often referred to in the art, can be particularly useful in treating a broader range of population of individuals.
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The invention having now generally been described, the "llltSlllü Sd eiltendeiA<sup>1</sup> more ™ · readily by reference to the following examples, which are provided by way of illustration and are not intended to be limiting of the present invention unless specified.
Example 1
Immunohistocompatibility investigations
A panel of 49 mAbs was generated from tumor cell / fetal progenitor cell immunizations. Antibodies were evaluated for their ability to show differential IHC staining of tumor tissue relative to normal, non-cancerous tissue, ability to be used in primate (and particularly monkey cynomolgus) models of antibody efficacy, levels of affinity, and specificity. of antigen and levels of immunomodulatory activity and cellular internalization. 21 of the mAbs were initially identified by MS analysis and / or binding to B7-H3-CHO cells. The remaining 28 mAbs were identified by reexamination of the library by ELISA with B7-H3 protein. The characteristics of 46 of the 49 panel members are provided in Table 2.
<td colspan="8">Table 2</td>
<td>Name</td><td>Isotype</td><td>IHC</td><td>ATCC network</td><td>Internalization</td><td>UDART ™</td><td>BIACORE ™ Analysis</td><td>Cyno B7-H3 binding</td>
<td>BRCA84D</td><td>IgGl / k</td><td>2nd</td><td> 2</td><td> +</td><td> +</td><td> +</td><td> 4-+</td>
<td>TDH6</td><td>IgGl / k</td><td>2nd</td><td> 1</td><td> +</td><td> +</td><td> +/-</td><td> +</td>
<td>TES7</td><td>IgGl / k</td><td>2nd</td><td> 1</td><td> 4-</td><td> +</td><td> +</td><td> -</td>
<td>BRCA68D</td><td>IgGl / k</td><td>2b</td><td> 3</td><td> 4-</td><td> +</td><td> ++</td><td> +4-</td>
<td>BRCA69D</td><td>IgGl / k</td><td>2b</td><td> 3</td><td> 4-</td><td> +</td><td> 4-4-</td><td> ++</td>
<td>GB8</td><td>IgGl / k</td><td>2b</td><td> 3</td><td> +</td><td> +</td><td> 4-</td><td> 4-4-</td>
<td>SG27</td><td>IgG2b / k</td><td>2b</td><td> 1</td><td></td><td> +</td><td> +</td><td> +</td>
<td>OVCA22</td><td>IgGl / k</td><td>2 C</td><td> 3</td><td> +</td><td> +</td><td> +/-</td><td> +</td>
<td>PRCA157</td><td>IgGl / k</td><td>2 C</td><td> 2</td><td> +</td><td> +</td><td></td><td>-H-</td>
<td>BLA8</td><td>IgGl / k</td><td>2 C</td><td></td><td> +/-</td><td> +</td><td> ++</td><td> +4-</td>
<td>KID35</td><td>IgGl / k</td><td>2 C</td><td> 2</td><td></td><td></td><td></td><td> 4-4-</td>
<td>LUCA50</td><td>IgG2a / k</td><td>2 C</td><td> 1</td><td></td><td></td><td> -1-</td><td> 4-4-</td>
<td>OVCA21</td><td>IgGl / k</td><td>2 C</td><td> 1</td><td></td><td> 4-</td><td> +</td><td> 4-</td>
<td>PRCA135</td><td>IgGl / k</td><td>2 C</td><td> 3</td><td></td><td> +</td><td></td><td> 4-4-</td>
<td>SG24</td><td>IgG2a / k</td><td>2 C</td><td> 3</td><td></td><td></td><td> ++</td><td> 4-4-</td>
<td>TDH5</td><td>IgGl / k</td><td>2 C</td><td> 3</td><td></td><td> 4-</td><td> 4-4-</td><td> 44-</td>
<td>BCCA66</td><td>IgGl / k</td><td>2 C</td><td> 2</td><td></td><td> +</td><td></td><td> -</td>
<td>RECAI 3</td><td>IgGl / k</td><td>2 C</td><td> 3</td><td></td><td> 4-</td><td></td><td> -</td>
<td>RECA9</td><td>IgGl / k</td><td>2 C</td><td> 3</td><td></td><td> 4-</td><td></td><td> -</td>
<td>PRCA123</td><td>IgGl / k</td><td>2c / 3</td><td> 3</td><td></td><td> 4-</td><td></td><td> +4-</td>
<td>BRCA126</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td></td>
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<td colspan="8">Table 2 ___________________</td>
<td>Name</td><td>Isotype</td><td>IHC</td><td>ATCC network</td><td>Internalization</td><td>UDART ™</td><td>BIACORE ™ Analysis</td><td>Cyno B7-H3 binding</td>
<td>BRCA192</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td></td>
<td>BRCA34</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td></td>
<td>KID1</td><td>IgGl / k</td><td>3 / F</td><td>ND</td><td> +</td><td> 4-</td><td></td><td> 4-</td>
<td>KID13</td><td>IgG2a / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td> 4-4-</td>
<td>LU14</td><td>IgG2b / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> -</td>
<td>LUCA1</td><td>IgGl / k</td><td>3 / F</td><td> 1</td><td> 4-</td><td> -1-</td><td> ++</td><td>-H-</td>
<td>MCLY42</td><td>IgG2a / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> ++</td>
<td>MCLY46</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> 4-4-</td>
<td>OVCA40</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> ++</td>
<td>PA20</td><td>IgGl / k</td><td>3 / F</td><td></td><td> +</td><td></td><td> ++</td><td> -</td>
<td>PA40</td><td>IgG2b / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td> -</td>
<td>PA41</td><td>IgGl / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td></td>
<td>PRO6</td><td>IgGl / k</td><td>3 / F</td><td> 2</td><td></td><td></td><td></td><td> -</td>
<td>RECA22</td><td>IgGl / k</td><td>3 / F</td><td> 3</td><td></td><td> -</td><td></td><td> +</td>
<td>SAL3</td><td>IgG2a / k</td><td>3 / F</td><td></td><td></td><td>-H- +</td><td></td><td> 4-4-</td>
<td>SG20</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> 4-</td>
<td>SG29</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> 4-4-</td>
<td>SKIN2</td><td>IgGl / k</td><td>3 / F</td><td> 3</td><td></td><td> +4-4-</td><td></td><td>-H-</td>
<td>STO5</td><td>IgG2b / k</td><td>3 / F</td><td> 3</td><td></td><td>-H-</td><td></td><td> +</td>
<td>TDH36</td><td>IgGl / k</td><td>3 / F</td><td> 2</td><td></td><td></td><td></td><td> 4-4-</td>
<td>TDH37</td><td>IgGl / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td> 4-</td>
<td>TDH4</td><td>IgGl / k</td><td>3 / F</td><td></td><td></td><td> +++</td><td> ++</td><td> 4-4-</td>
<td>TDH40</td><td>IgG2b / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td> 4-4-</td>
<td>TDH44</td><td>IgG2b / k</td><td>3 / F</td><td></td><td></td><td></td><td></td><td> 4-4-</td>
<td>OVCA25</td><td>IgGl / k</td><td>3 / F</td><td> 3</td><td></td><td></td><td></td><td> 4-</td>
IHC staining confirmed that the panel comprised antibodies that elicited a strong differential binding of tumor versus normal tissue in many of the identified antibodies, showed a range of binding properties by BIACORE ™ analysis, showed reactivity against the range of overlapping and non-overlapping epitopes and showed a range of specificity for 4Ig versus 2Ig B7-H3. The characteristics of the nine best candidates are shown in Table 3 and Table 4.
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<td colspan="6">Table 3 ...........—— - ·</td>
<td>Name</td><td>Normal fabric</td><td>Colon cancer</td><td>Lung cancer</td><td>Prostate cancer</td><td>Breast cancer</td>
<td>BRCA84D</td><td>Colon 1+ Lung 1+ Liver 1+</td><td> 1231 *</td><td> 1130</td><td> 112</td><td>lili</td>
<td>TDH6</td><td>Colon 1+ Pan 1+ Kidney 1+ Lung 1+ Liver 1+</td><td> 1110 *</td><td> 1010</td><td> 111</td><td> 1011</td>
<td>TES7</td><td></td><td> 1,5</td><td> 1,75</td><td> 3</td><td> 3</td>
<td>BRCA68D</td><td>Pan 1+ Kidney 1+ Lung 1+ Liver 2+</td><td> 2321 *</td><td> 3332</td><td> 333</td><td> 3333</td>
<td>BRCA69D</td><td>Colon 1+ Pan 1+ Kidney 1+ Liver 1+</td><td> 2231 *</td><td> 3231</td><td> 333</td><td> 3333</td>
<td>GB8</td><td></td><td></td><td></td><td></td><td></td>
<td>SG27</td><td>Colon 1+ Pan 1+ Kidney 1+ Liver 1+</td><td> 1221 *</td><td> 1120</td><td> 222</td><td> 1122</td>
<td>OVCA22</td><td>Colon 2+ Panc 2+ Liver 2+</td><td> 1122</td><td> 3131 **</td><td> 222</td><td> 3233</td>
<td>PRCA157</td><td>Colon 2+ Liver 2+ Skin 2+</td><td> 2231 *</td><td> 3231</td><td> 333</td><td> 2333</td>
<td colspan="6">* + str too; ** str 3+</td>
<td colspan="3">Table 4</td>
<td>Name</td><td>Specificity 2Ig / 4Ig</td><td>Epitope group</td>
<td>BRCA84D</td><td>4Ig / 2Ig</td><td> 1</td>
<td>TDH6</td><td>4Ig / 2Ig</td><td> 2</td>
<td>TES7</td><td>4Ig</td><td> 3</td>
<td>BRCA68D</td><td>4Ig / 2Ig</td><td> 4</td>
<td>BRCA69D</td><td>4Ig / 2Ig</td><td> 4</td>
<td>GB8</td><td>4Ig / 2Ig</td><td> 5</td>
<td>SG27</td><td>4Ig / 2Ig</td><td> 6</td>
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<td>OVCA22</td><td>4Ig</td><td> 7 -</td>
<td>PRCA157</td><td>4Ig / 2Ig</td><td> 8</td>
Table 5 provides a summary of the activity profiles of these antibodies.
<td colspan="4">Ta</td><td colspan="4">Ma 5</td>
<td>Name</td><td>Normal tissue staining</td><td>Differentiated tumor / normal</td><td>Positive for tumor tissue 1</td><td>Cyno cross reactivity</td><td>IHC *</td><td>BIACORE TM Union</td><td>UDARTTM Activity</td>
<td>BRCA84 D</td><td> 1</td><td> 1</td><td>Stromal tumor bv</td><td>Positive (not 1: 1)</td><td> 78</td><td>-H-</td><td>-H-</td>
<td>TES7</td><td> 1</td><td> 1</td><td>Stromal tumor bv</td><td>negative</td><td> 1250</td><td> +</td><td>-H-</td>
<td>BRCA68 D</td><td> 3</td><td> 3</td><td>Tumor</td><td>Positive (1: 1)</td><td> 20</td><td> +++</td><td> ++</td>
<td>BRCA69 D</td><td> 3</td><td> 3</td><td>Stromal tumor</td><td>Positive (1: 1)</td><td> 20</td><td>+ -H-</td><td>-H-</td>
<td>GB8</td><td>2/3 (adrenal gland ND)</td><td> 3/4</td><td>Stromal tumor</td><td>ND, + recomb.</td><td> 625</td><td> +</td><td> +</td>
<td>SG27</td><td> 2/3</td><td>ND</td><td>ND</td><td>ND, + recomb.</td><td> 2000 0</td><td> +</td><td> +</td>
<td>OVCA22</td><td> 1</td><td> 1</td><td>Stromal tumor</td><td>Negative + recomb.</td><td> 2500</td><td> +</td><td> ++</td>
<td>PRCA15 7</td><td> 2</td><td> 3</td><td>Stromal tumor bv</td><td>Positive (1: 1)</td><td> 20</td><td>ND</td><td> ++</td>
<td colspan="8">* Optimal concentration in ng / ml; ND, not determined</td>
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An analysis of the activities of the antibodies shown in Table 6 revealed that their respective profiles differed and that each antibody was associated with both advantages and disadvantages with each other (Table 6).
<td colspan="3">Table 6</td>
<td>Antibody</td><td>Advantage</td><td>Disadvantages</td>
<td>BRCA84D</td><td># 1 normal tissue staining # 1 tumor / normal differential Tumor staining, stroma, BV Medium affinity, single binding site (titratable binding)</td><td>No 1: 1 Cyno cross-reactivity</td>
<td>BRCA68D</td><td># 3 normal tissue staining # 3 differential tumor / normal Cyno 1: 1 cross-reactivity high affinity Powerful UDART ™ activity</td><td>Only tumor staining</td>
<td>BRCA69D</td><td># 3 normal tissue staining # 3 tumor / normal differential Cyno 1: 1 cross-reactivity Tumor staining, high affinity stroma Powerful UDART ™ activity</td><td></td>
<td>PRCA157</td><td># 2 normal tissue staining # 3 tumor / normal differential Cyno 1: 1 cross-reactivity Tumor staining, stroma, BV Powerful UDART ™ activity</td><td>BIACORE ™</td>
<td>TES7</td><td># 1/2 normal tissue staining # 1/2 tumor / normal differential Tumor staining, stroma, BV Specific for 4Ig Powerful UDART ™ activity</td><td>No cross reactivity of Cyno low affinity</td>
<td>OVCA22</td><td># 1/2 normal tissue staining # 1/2 tumor differential / normal low affinity Tumor staining, stroma Specific for 4Ig Powerful UDART ™ Activity</td><td>No cross reactivity of Cyno low affinity</td>
<td>GB8</td><td># 2/3 staining of normal tissue (adrenal glands not determined) # 3/4 tumor / normal differential Tumor staining, stroma Moderate UDART ™ activity</td><td>Cyno cross-reactivity not determined Low affinity</td>
<td>SG27</td><td># 2/3 tumor / normal differential normal tissue staining not determined Moderate UDART ™ activity</td><td>Cyno cross-reactivity not determined Low affinity</td>
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Since BRCA84D, BRCA68D, BRCA69D and PRCA 157 showed cleaner normal tissue IHC profiles, stronger normal tumor V IHC differential, moderate to strong binding (BIACORE ™ / IHC), cross-reactivity against B7-H3 from cynomolgus monkeys, and potent UDART ™ activity, these antibody species were selected for further development. These antibodies differentiated from TES7 and OVCA2, which showed low affinity (in the BIACORE ™ assay), and no cross-reactivity against B7-H3 from cynomolgus monkeys. These antibodies differentiated from SG27, which showed low affinity (in the BIACORE ™ assay), poor IHC performance (weak binding), and lower UDART ™ activity. These antibodies differentiated from GB8, which showed low affinity (in the BIACORE ™ assay), low tumor / normal IHC differential, and lower UDART ™ activity.
Using Caki-2 and Hs700T positive control cells, IHC investigations revealed that each of the antibodies showed a different optimal concentration and a different differential concentration from each other (Table 7).
<td colspan="4">Table 7</td>
<td>Antibody</td><td>Optimal IHC concentration</td><td colspan="2">Differential IHC concentration</td>
<td>BRCA84D</td><td>0.625 pg / ml</td><td> 0,078</td><td>pg / ml</td>
<td>BRCA68D</td><td>0.156 μg / nll</td><td> 0,0195</td><td>pg / ml</td>
<td>BRCA69D</td><td>0.156 pg / ml</td><td> 0,0195</td><td>pg / ml</td>
<td>PRCA157</td><td>0.078 pg / ml</td><td> 0,0195</td><td>pg / ml</td>
<td>TES7</td><td>5 gg / ml</td><td> 1,25</td><td>pg / ml</td>
<td>OVCA22</td><td>10 pg / ml</td><td> 2,5</td><td>gg / ml ♦</td>
<td>GB8</td><td>1.25 pg / ml</td><td> 0,625</td><td>pg / ml</td>
<td>SG27</td><td>20 pg / ml</td><td colspan="2">Undetermined **</td>
<td>TDH6</td><td>20 pg / ml</td><td colspan="2">Undetermined ***</td>
<td colspan="2">* OVCA22 only showed binding to Hs700T ca cells. Optimization decision based * * Since SG27 did not show results between two operators, no differential was determined. * ** TDH6 study not performed due to positive control cells</td><td colspan="2">d2, did not show binding to la cells at caki2 cell binding. consistent titration analysis low affinity and concentration too low affinity against</td>
Using the optimal and differential concentrations indicated in Table 7, the IHC responses of the antibodies against B7-H3 were determined in human tissues. The results of these analyzes for adrenal glands, liver, pancreas, kidney, lung, and colon are shown in Tables 8A-8B and Tables 9A-9B (all antibodies showed negative IHC responses for heart tissue).
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<td colspan="4">Table 8A: IHC of mAb versus B7H3 at optimal concentration in human tissues</td>
<td>AcM</td><td>Adrenal gland</td><td>Liver</td><td>Pancreas</td>
<td>BRCA84D 0.625 pg / ml</td><td>Negative</td><td>Sinosoid lining cells ++ Hepatocytes +, 5-10%</td><td>Epithelium + 5% Fiber ++</td>
<td>BRCA68D 0.156 pg / ml</td><td>Bark +++</td><td>Sinosoid lining cells ++ Hepatocytes ++ (m)</td><td>Epithelium + Fiber ++</td>
<td>BRCA69D 0.156 pg / ml</td><td>Bark +++</td><td>Hepatocytes ++ (m)</td><td>Epithelium + Fiber ++</td>
<td>TES7 5 pg / ml</td><td>Bark +</td><td>Sinosoid Lining Cells +</td><td>Epithelium + 5% Fiber ++</td>
<td>OVCA22 10 pg / ml</td><td>Bark +</td><td>Sinosoid lining cells ++ Hepatocytes + (m)</td><td>Epithelium + 5% Fiber ++</td>
<td>PRCA157 0.078 pg / ml</td><td>Bark ++</td><td>Sinosoid lining cells ++ Hepatocytes + (m)</td><td>Epithelium + 5% Fiber ++</td>
<td>GB8 1.25 pg / ml</td><td>Undetermined</td><td>Sinosoid lining cells ++ Hepatocytes + (m)</td><td>Epithelium + Fiber ++</td>
<td colspan="4">Table 8B: IHC of mAb versus B7H3 at optimal concentration in human tissues</td>
<td>AcM</td><td>Kidney</td><td>Lung</td><td>Colon</td>
<td>BRCA84D 0.625 pg / ml</td><td>Negative</td><td>Epithelium + (5-10%)</td><td>Epithelium +</td>
<td>BRCA68D 0.156 pg / ml</td><td>Fibroblast +, rare</td><td>Epithelium +</td><td>Mucosa</td>
<td>BRCA69D 0.156 pg / ml</td><td>Fibroblast +, rare</td><td>Epithelium +</td><td>Mucosa +</td>
<td>TES7 5 pg / ml</td><td>Negative</td><td>Negative</td><td>Epithelium +</td>
<td>OVCA22 10 pg / ml</td><td>Fibroblast +</td><td>Negative</td><td>Epithelium +</td>
<td>PRCA157 0.078 pg / ml</td><td>Negative</td><td>Negative</td><td>Mucosa +</td>
<td>GB8 1.25 pg / ml</td><td>Negative</td><td>Epithelium +</td><td>Mucosa +</td>
<td colspan="2">Table 9A: IHC of mAb versus B7</td><td colspan="2">H3 at differential concentration in thihuman tissues</td>
<td>AcM</td><td>Adrenal gland</td><td>Liver</td><td>Pancreas</td>
<td>BRCA84D</td><td>Negative</td><td>Coating cells</td><td>Fiber + (little</td>
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<td>0.078 pg / ml</td><td></td><td>sinosoid +</td><td>frequent)</td>
<td>BRCA68D 0.0195 pg / ml</td><td>Bark ++</td><td>Hepatocytes + (m)</td><td>Fiber +</td>
<td>BRCA69D 0.0195 pg / ml</td><td>Cortex -H-</td><td>Hepatocytes + (m)</td><td>Fiber +</td>
<td>TES7 1.25 pg / ml</td><td>Fibroblast +</td><td>Sinosoid Lining Cells +</td><td>Epithelium +, 5% Fiber ++</td>
<td>OVCA22 2.5 pg / ml</td><td>Fibroblast +</td><td>Sinosoid Lining Cells +</td><td>Fiber +</td>
<td>PRCA157 0.0195 pg / ml</td><td>Undetermined</td><td>Sinosoid lining cells ~ Hepatocytes + (m)</td><td>Fiber +</td>
<td>GB8 0.625 pg / ml</td><td>Undetermined</td><td>Sinus lining cells 4-4 Hepatocytes + (m)</td><td>Fiber +</td>
<td colspan="4">Table 9B: IHC of mAb versus B7H3 at differential concentration in human tissues</td>
<td>AcM</td><td>Kidney</td><td>Lung</td><td>Colon</td>
<td>BRCA84D 0.078 pg / ml</td><td>Negative</td><td>Negative</td><td>Epithelium 4-</td>
<td>BRCA68D 0.0195 pg / ml</td><td>Negative</td><td>Fibrin + (rare)</td><td>Mucosa +</td>
<td>BRCA69D 0.0195 pg / ml</td><td>Negative</td><td>Negative</td><td>Mucosa +</td>
<td>TES7 1.25 pg / ml</td><td>Negative</td><td>Negative</td><td>Epithelium +</td>
<td>OVCA22 2.5 pg / ml</td><td>Negative</td><td>Negative</td><td>Epithelium 4-</td>
<td>PRCA157 0.0195 pg / ml</td><td>Negative</td><td>Negative</td><td>Mucosa 4-</td>
<td>GB8 0.625 pg / ml</td><td>Negative</td><td>Negative</td><td>Mucosa 4-</td>
IHC investigations conducted using cancer samples showed that the B7-H3 antibodies of the present invention could be used to identify and diagnose cancer in multiple tissue sources (Table 10). In table 10, the numbers indicate the number of 5 positive signs (1 = 4-, 2 = 4-4-, 3 = +++); each number referring to a different sample tested.
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Table 10
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<td>AcM</td><td>pg / ml</td><td>Prostate cancer</td><td>Breast cancer</td><td>CáriCSPW lung</td><td>Lánc¿p colon</td>
<td rowspan="2">BRCA84D</td><td>0.625 pg / ml</td><td> 2,2,1</td><td> 3, 3, 3, 3</td><td>2, 3, 2 (stroma), l (bv)</td><td>2 (stroma), 3, 3, 3 (stroma)</td>
<td>0.078 gg / ml</td><td> 0, 2, 3, 2</td><td>1 (stroma), 1 (stroma), 1 (stroma), 2.3</td><td> 1, 1,0, 1</td><td>2, 2 (stroma), 1 (stroma), 2 (stroma)</td>
<td rowspan="2">BRCA68D</td><td>0.156 pg / ml</td><td> 2, 3, 3, 3</td><td> 2, 3, 3, 3, 3</td><td> 3, 3, 2, 2</td><td> 3, 3, 3, 3</td>
<td>0.0195 pg / ml</td><td> 0, 1, 1, 1</td><td> 0, 0, 2, 2, 1</td><td> 0, 1, 1,0</td><td>1, i, i, i</td>
<td rowspan="2">BRCA69D</td><td>0.156 pg / ml</td><td> 3,3,3</td><td> 3, 3, 3, 3, 3</td><td>3, 3, 2, 2 (stroma)</td><td> 3, 3, 3, 3</td>
<td></td><td> 0, 1, 2, 1</td><td> 1,2, 1, 1</td><td> 1, 1,0, 1</td><td>l (bv), 2 (stroma), 1,1</td>
<td rowspan="2">GB8</td><td>1.25 gg / ml</td><td> 2,3, 1</td><td> 2, 2, 1, 2</td><td> 3, 3, 0,0</td><td>2 (stroma), 2, 2.2</td>
<td>0.625 pg / ml</td><td> 0,1,1</td><td> 0, 0, 0, 0, 1</td><td> 1,0, 0,0</td><td>1 (stroma), 1 (stroma), 0.0</td>
<td rowspan="2">TES7</td><td>5 pg / ml</td><td> 2, 3, 2, 3</td><td>1 (stroma), 3,3,3,2</td><td>3.2, 1 (stroma), l (bv)</td><td> 3, 3, 2,2</td>
<td>1.25 pg / ml</td><td> 1,2, 2,3</td><td>1 (stroma), 2,3, 3, 2</td><td>3, 1, 1 (stroma), l (bv)</td><td>3, 2 (stroma), 2 (stroma), 2</td>
<td rowspan="2">OVCA22</td><td>10 pg / ml</td><td> 3, 2, 2, 1</td><td>1 (stroma), 2, 2, 3, 3</td><td>3,2, 1 (stroma), 0</td><td>1 (stroma), 1, i, 2 (stroma)</td>
<td>2.5 pg / ml</td><td> 1, 1,3, 1</td><td>1 (stroma), 1 (stroma), 1 (stroma), 3,2,2</td><td> 2, 1,0,0</td><td>1.0, 2 (stroma), 0</td>
<td rowspan="2">PRCA157</td><td>0.078 pg / ml</td><td> 2, 2, 2, 3</td><td> 1,2, 2, 3,3</td><td>2, 2, 1 (stroma), l (bv)</td><td>3, 3, 2 (stroma), 2 (stroma)</td>
<td>0.0195 pg / ml</td><td> 0, 1, 2, 1</td><td>1 (stroma), 0, 2, 1 (stroma)</td><td> 0,1,0,0</td><td>eleven, 1 (stroma), 1 (stroma)</td>
For prostate, breast, colon and lung cancer cells treated with antibody to B7-H3 BRCA84D, tumor sample staining was present in tumor cells and stromal cells, including tumor vasculature. In some tumor samples, staining of the
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INSTITUTO MEXICANO I heard the noniiMD industrial stroma was much stronger than tumor cells. When BRCA84D mAb was titrated to a lower concentration, some cases showed reduced staining in tumor cells, but still maintained strong stromal staining. After staining with BRCA84D at 0.625 pg / ml, prostate cancer cells showed an IHC of 3/3 +; breast cancer cells showed an IHC of 4/4 +; colon cancer cells showed an IHC of 4/4 + and lung cancer cells showed an IHC of 4/4 +. After staining with BRCA84D at 0.078 pg / ml, prostate cancer cells showed an IHC of 3/4 +; breast cancer cells showed an IHC of 5/5 +; colon cancer cells showed an IHC of 4/4 + and lung cancer cells showed an IHC of 3/4 +.
Normal liver was treated with antibody to B7-H3 BRCA68D, and staining was observed in hepatocytes and sinus lining cells. Normal pancreas stained with antibody to B7-H3 BRCA68D showed multi-focal staining in collagen fiber and epithelium. Normal adrenal gland cells treated with antibody to B7-H3 BRCA68D showed staining in the cortex. After staining with BRCA68D at 0.156 pg / ml, gastric, renal and ovarian cancer cells all exhibited an IHC of 5/5 +.
Additional IHC staining analyzes were performed with gastric, kidney and ovarian cancer tissue samples. The results of such analyzes are shown in Table 12. In Table 11, the numbers indicate the number of positive signs (1 = +, 2 = ++, 3 = +++); each number referring to a different sample tested.
<td colspan="5">Table 11</td>
<td>AcM</td><td>pg / ml</td><td>Gastric cancer</td><td>Kidney cancer</td><td>Ovarian cancer</td>
<td rowspan="2">BRCA84D</td><td>0.625 pg / ml</td><td> 2,1,2,2,2</td><td> 1,2,1,1,1</td><td> 0,3,1,2,2</td>
<td>0.078 pg / ml</td><td>LOALO</td><td> 0,1,0,1,0,1</td><td> 0,2,0,1,1</td>
<td rowspan="2">BRCA68D</td><td>0.156 pg / ml</td><td> 3,2,3,3,3</td><td> 3,3,2,3,3,3</td><td> 2,3,3,2,2</td>
<td>0.0195 pg / ml</td><td> 2,1,2,1,1</td><td> 2,2,2,2,2,2</td><td> 1,2,2,1,1</td>
<td rowspan="2">OVCA22</td><td>10 pg / ml</td><td> 3,1,3,1,1</td><td> 3,1,2,3,0,2</td><td> 2,3,2,1,1</td>
<td>2.5 pg / ml</td><td> 2,0,2,1,0</td><td> 2,1,1,2,0,1</td><td> 1,2,1,0,1</td>
<td rowspan="2">TES7</td><td>5 pg / ml</td><td> 2,1,3,2,1</td><td> 2,3,1,2,2,1</td><td> 1,3,1,2,2</td>
<td>1.25 pg / ml</td><td> 2,0,2,1,1</td><td> 2,2,1,1,1,1</td><td> 1,3,1,2,2</td>
In summary, all mAbs tested showed varying degrees of staining intensity in normal liver, pancreas, colon, and lung. Figure 1A shows the results of IHC investigations performed using normal tissue samples from pancreas, liver, lung 117
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JTTTUT · ΜβΟΟΛΝΟ INDUSTRIAL MLAmoMTY and colon with BRCA84D at 0.625 pg / ml and 0.078 pg / ml. Liver staining was relatively limited in sinus lining cells (fibroblast and Kupffer cells) with BRCA84D and TES7. OVCA22 showed membrane hepatocyte staining in addition to sinusoid lining cells at the optimal concentration. However, the staining in hepatocytes disappeared at the differential concentration. All other mAbs showed hepatocyte staining including either membrane or cytoplasmic staining at both optimal and differential concentrations. Staining of the pancreas was observed mainly in collagen fiber and a small percentage of the epithelium (acinar cells or / and intercalated duct cells). The staining in the epithelium decreased or disappeared at the differential concentration. Colon staining was relatively limited in the apical membrane of crypt epithelium and fibroblasts in mucosa. No binding was observed in colon lymphoid nodules. The lung showed very weak and irregular staining in the epithelium with BRCA84D, BRCA68D, BRCA69D and GB8. However, the staining disappeared at the differential concentration. No staining in the lung was observed with TES7, OVCA22 and PRCA157 at both concentrations. Adrenal cortex staining was observed with almost all mAbs at the optimal concentration, except for BRCA84D. Staining in the adrenal glands was obviously decreased with TES7 and OVCA22 at the differential concentration. The heart and kidney showed no obvious staining with any of the mAbs (Figure IB). In view of these properties, BRCA84D was considered to be the best of the mAbs, followed in order by (2) TES7, (3) OVCA22, (4) the BRCA68D group, BRCA69D and PRCA157, and lastly (5) GB8 .
All the mAbs included in the study showed positive staining with 4 types of cancer at the optimal concentration. At the differential concentration, BRCA84D still maintained good staining in prostate cancer, breast cancer, and colon cancer. TES7 maintained good staining in 4 types of cancer in the study. The remaining mAbs showed varying intensities of staining in different tumor types. Staining of tumor samples was observed in tumor cells and stromal cells, including vasculature. Some tumor samples showed positive staining only in the vasculature, ie BRCA84D, BRCA69D, TES7 and PRCA 157. Some tumors showed stronger stromal staining than tumor cell staining. When the mAbs were titrated to a lower concentration in those samples, some cases showed a decrease or absence of staining in tumor cells, but still maintained strong stromal staining. In general, regarding the expression in normal human tissues and differential expression in normal versus tumor tissues, the order of mAb from the best IHC performance to the worst performance is as follows: (1) BRCA84D, (2) TES7, (3) OVCA22, (4) the group
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BRCA68D, BRCA69D and PRCA157, and lastly (5) GB8. Table 12 and Figure 2 show results for the BRCA84D antibody.
<td colspan="3">Table 12</td>
<td>Cancerous tissue type</td><td>BRCA84D 0.625 μg / ml</td><td>BRCA84D 0.078 pg / ml</td>
<td>Prostate</td><td> 3/3+</td><td> 3/4+</td>
<td>Mother</td><td> 4/4+</td><td> 5/5+</td>
<td>Colon</td><td> 4/4+</td><td> 4/4+</td>
<td>Lung</td><td> 4/4+</td><td> 3/4+</td>
Example 2
Cynomolgus monkey B7-H3 cross reactivity
The cynomolgus monkey B7-H3 sequence shares approximately 90% homology with its human counterpart, suggesting that the cynomolgus monkey is an excellent model for human B7-H3 interactions. Investigations were carried out to evaluate the cross-reactivity of candidates against B7H3 BRCA84D, BRCA68D, BRCA69D, TES7, OVCA22 and PRCA 157 with the adrenal gland, liver, kidney, pancreas and lung as well as a 10 case of placenta at the end of gestation of cynomolgus monkey , in order to compare any cross-reactivity with the staining intensity and staining patterns observed for human tissues.
The staining concentration for each mAb tested is the optimal concentration that was determined in Caki-2 and Hs700T positive control cells (see Table 8). Commercial goat anti-human B7-H3 antibody (cyno cross-reacted) was selected as a positive control antibody to stain cynomolgus placenta tissue. Corresponding isotype controls were applied in each series of experiments. The results of the investigations are shown in table 13.
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<td colspan="7">Table 13 -..... .....</td>
<td>AcM</td><td>Adrenal gland 1 (2)</td><td>Liver (2)</td><td>Pancreas (2)</td><td>Kidney (2)</td><td>Lung (two)</td><td>Placenta (1)</td>
<td>BRCA84 D 0.625 pg / ml</td><td>Negative</td><td>Negative</td><td>Negative</td><td>Negative</td><td>1/2 Epithelium 1+</td><td>Expired cells 2+ negative for mesenchymal cells s</td>
<td>BRCA68D 0.156 pg / m</td><td>Bark 3+</td><td>2/2 Hepatocytes l + (m) Coating cells 0 sinosoid 1+</td><td>1/2 Fiber 2+ Epithelium 1+</td><td>Fibroblast 0 1+</td><td>Negative 0</td><td>Deciduous cells, hairs, mesenchymal cells s 3+</td>
<td>BRCA69D 0.156 pg / m</td><td>Bark 2+</td><td>1/2 Hepatocytes l + (m)</td><td>1/2 Epithelium 1+</td><td>Fibroblast 0 1+ rare</td><td>Negative 0</td><td>Deciduous cells 2+, hairs, mesenchymal cells s 2+</td>
<td>TES7 5 pg / ml</td><td>Negative</td><td>Negative</td><td>Negative</td><td>Negative</td><td>Negative 0</td><td>Negative</td>
<td>OVCA22 10 pg / ml</td><td>Negative</td><td>Negative</td><td>Negative</td><td>Negative</td><td>negative</td><td>Negative</td>
<td>PRCA157 0.078 pg / m</td><td>Bark 1+</td><td>1/2 Hepatocytes l + (m)</td><td>Negative</td><td>Negative</td><td>Negative 0</td><td>Deciduous cells 2+, hairs, mesenchymal cells s 1+</td>
<td colspan="7">Note: BRCA84D showed negative staining in liver and pancreas at up to 5 pg / ml. Although OVCA22 did not bind to cyno tissue at IHC, moderate binding to recombinant cyno B7H3 was observed in CHO cells. The IHC score in normal tissues is negative, grading system 1+, 2+, and 3+ 4; m = membrane; 2/2 = 2 of 2 cases, * / 2 = 1 of 2 cases</td>
Investigation of BRCA84D IHC staining (0.625 pg / ml) in cynomolgus placenta showed staining in deciduous cells, but not in villi. Cyno staining was not observed in liver and pancreas, however, sinus lining cells were observed in human liver and localized fiber and epithelium staining was observed in human pancreas tissue.
Investigation of IHC staining of BRCA68D (0.156 pg / ml) in cynomolgus placenta showed staining in deciduous cells, mesenchymal cells (endothelium and fibroblasts) and villi. Staining was present in the hepatocyte membrane and fibroblast cytoplasm of the
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Dt LA noñuMD industrial i liver, as well as in pancreatic fiber and in the cytoplasm of pancreatic epithelium. Thus, human and cyno pancreatic and liver tissue show similar staining patterns with BRCA68D.
In summary, BRCA84D, BRCA68D, BRCA69D, and PRCA 157 all showed cross-reactivity in cyno tissues. BRCA84D showed no staining in monkey liver and pancreas; Such staining was observed in human liver and pancreatic tissues. BRCA68D and BRCA69D showed similar staining intensity and staining patterns in monkey tissues. Although BRCA68D, BRCA69D and PRCA157 showed a comparable staining pattern with human tissues, the intensity of staining is not identical with human tissues under optimal conditions. TES7 and OVCA22 did not show any staining in monkey tissues under optimal conditions.
A summary of the comparative results of IHC staining in cynomolgus tissue and human tissue is provided in Table 14.
<td colspan="7">Table 14</td>
<td>AcM</td><td>Adrenal gland 1</td><td>Liver</td><td>Pancreas</td><td>Kidney</td><td>Lung</td><td>Placenta</td>
<td>BRCA84D 0.625 pg / ml Cynomolgu s</td><td>Negative</td><td>Negative</td><td>Negative</td><td>Negative</td><td>1/2 Epithelium 1+</td><td>Deciduous cells 2+ negative for mesenchymal cells s</td>
<td>BRCA84D 0.625 pg / ml Human</td><td>Negative</td><td>2/2 Sinosoid Coating Cells 2+, Hepatocytes 1+ 5-10%</td><td>Epithelium 1+, 5%, Fiber 2+</td><td>Negative</td><td>Epithelium 1+, 5-10%</td><td>Deciduous cells 1+, hairs, mesenchymal cells s 1+</td>
<td>BRCA68D 0.156 pg / ml Cynomolgu s</td><td>Bark 3+</td><td>2/2 Hepatocytes l + (m) Sinosoid lining cells 1+</td><td>1/2 Fiber 2+ Epithelium 1+</td><td>Fibroblast or 1+</td><td>Negative 0</td><td>Deciduous cells, hairs, mesenchymal cells s 3+</td>
<td>BRCA68D 0.156 pg / ml</td><td>Bark 3+</td><td>Coating cells</td><td>Epithelium 1+</td><td>Fibroblast or 1+</td><td>Epithelium 1+</td><td>Deciduous 3+ cells, hairs,</td>
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<td>Human</td><td></td><td>or sinosoid 2+, Hepatocytes 2+ (m)</td><td>Fiber 2+</td><td>infrequent</td><td></td><td>,, cells,. mesenchymal s 3+</td>
<td>BRCA69D 0.156 pg / ml Cynomolgu s</td><td>Bark 2+</td><td>1/2 Hepatocytes l + (m)</td><td>1/2 Epithelium 1+</td><td>Fibroblast or 1+ rare</td><td>Negative 0</td><td>Deciduous cells 2+, hairs, mesenchymal cells s 2+</td>
<td>BRCA69D 0.156 pg / ml Human</td><td>Bark 3+</td><td>Hepatocytes 2+ (m)</td><td>Epithelium 1+ Fiber 2+</td><td>Fibroblast or 1+ rare</td><td>Epithelium 1+</td><td>Deciduous cells 3+, hairs, mesenchymal cells 3+</td>
<td>PRCA157 0.078 pg / ml Cynomolgu s</td><td>Bark 1+</td><td>1/2 Hepatocytes l + (m)</td><td>Negative</td><td>Negative</td><td>Negative 0</td><td>Deciduous cells 2+, hairs, mesenchymal cells s 1+</td>
<td>PRCA157 0.078 pg / ml Human</td><td>Bark 2+</td><td>2+ Sinosoid Coating Cells, I + Hepatocytes (m)</td><td>Epithelium 1+ 5% Fiber 2+</td><td>Negative</td><td>Negative 0</td><td>Undetermined</td>
Example 3
MAbs against B7-H3 bind to multiple ATCC cancer cell lines
It was found that the antibodies of the present invention could bind to multiple cancer cell lines contained in the collections of the American collection of type cultures. Table 15 and Table 16 summarize the binding results.
<td colspan="6">Table 15</td>
<td></td><td colspan="5">Antibody</td>
<td>Cell lines</td><td>BLA08</td><td>BRCA68D</td><td>BRCA69D</td><td>BRCA84D</td><td>PRCA157</td>
<td colspan="6">Normal human lines</td>
<td>HMEC</td><td> ++/+++</td><td> +++</td><td> +++</td><td> ++</td><td></td>
<td>HUVEC</td><td>ND</td><td> ++</td><td> +/++</td><td> +/-</td><td> +/++</td>
<td colspan="3">Cancer lines c</td><td colspan="3">human breast</td>
<td>BT474</td><td> +++</td><td> ++</td><td> ++/+++</td><td> +/++</td><td> ++/+++</td>
<td>MCF7</td><td> +++</td><td> ++</td><td> ++/+++</td><td> +</td><td> ++</td>
<td>MDA175</td><td>ND</td><td></td><td></td><td></td><td></td>
<td>MDA361</td><td>ND</td><td> ++</td><td></td><td> +/+/-</td><td>-H-</td>
<td>SKBR3</td><td> +++</td><td></td><td> ++</td><td></td><td></td>
<td colspan="6">Human lung cancer lines</td>
<td>A549</td><td> +++</td><td> +/+/-</td><td> +/-</td><td></td><td> +/-</td>
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<td>Calu3</td><td>4-H-</td><td> +/++</td><td> +</td><td></td><td> +/++</td>
<td>SKMES1</td><td>4-H-</td><td> ++</td><td>4 - + / 4-H-</td><td> +/++</td><td> +4-</td>
<td colspan="3">Cancer lines <</td><td colspan="3">e human ovary</td>
<td>ES-2</td><td>4-H-</td><td> +/-</td><td></td><td></td><td></td>
<td>SKOV3</td><td>4-H-</td><td> ++</td><td> +/++</td><td> +/+/-</td><td>-H-</td>
<td colspan="6">Human pancreatic cancer lines</td>
<td>Panc-1</td><td> ++/+++</td><td> +/++</td><td> +/++</td><td> +/+/-</td><td> +/++</td>
<td>AsPC-1</td><td>4-H-</td><td></td><td></td><td></td><td></td>
<td>HPAFII</td><td>4-H-</td><td></td><td></td><td></td><td></td>
<td>Hs700T</td><td> +4-4-</td><td>-H- / 4-H-</td><td></td><td>4-H-</td><td>4-H-</td>
<td colspan="6">Human colon cancer lines</td>
<td>Colo205</td><td>ND</td><td></td><td></td><td></td><td></td>
<td>HT-29</td><td> +++</td><td> +</td><td> +</td><td></td><td> +</td>
<td>SW480</td><td>4-H-</td><td> +/-</td><td></td><td> +/-</td><td></td>
<td>SW948</td><td>ND</td><td> +</td><td> +</td><td></td><td></td>
<td colspan="6">Human kidney cancer lines</td>
<td> 293</td><td>4-H-</td><td> ++</td><td> ++</td><td> +</td><td>-H - / - H-4-</td>
<td> 786-0</td><td>4-H-</td><td>-H-</td><td> ++</td><td> +</td><td> 4-+/+++</td>
<td>A498</td><td>4-H-</td><td>-H-</td><td> ++</td><td> ++</td><td>4 - + / 4-H-</td>
<td>Caki2</td><td>4-H-</td><td>4-H-</td><td> +++</td><td> ++</td><td>4-4- / 4-H-</td>
<td colspan="6">Non-human cell lines</td>
<td>Cos7</td><td>4-H-</td><td> +</td><td> +/++</td><td> +/-</td><td> +/++</td>
<td>RL65</td><td> -</td><td></td><td></td><td></td><td></td>
<td>SVT2</td><td>ND</td><td></td><td></td><td></td><td></td>
<td colspan="6">Human prostate cancer lines</td>
<td>22Rvl</td><td> +++</td><td></td><td></td><td></td><td></td>
<td>DU145</td><td>4-H-</td><td> +</td><td> +</td><td> +</td><td> +/+/-</td>
<td>LNCaP</td><td>4-H-</td><td> ++</td><td> ++</td><td> +/++</td><td>4 - + / 4-H-</td>
<td>PC3</td><td> +++</td><td> +/+/-</td><td> +/-</td><td> +/-</td><td> +/-</td>
<td>TDH</td><td>ND</td><td> +/+/-</td><td> +/+/-</td><td></td><td> +</td>
<td colspan="6">Human stomach cancer lines</td>
<td>HS746T</td><td>ND</td><td> +/++</td><td> +/++</td><td> +</td><td> ++</td>
<td>N87</td><td>ND</td><td> +/++</td><td> +/++</td><td> +/-</td><td> +/++</td>
<td colspan="6">Table 16</td>
<td></td><td colspan="5">Antibody</td>
<td>Cell lines</td><td>TDH06</td><td>OVCA22</td><td>GB8</td><td>SG27</td><td>TES7</td>
<td colspan="6">Normal human lines</td>
<td>HMEC</td><td></td><td></td><td></td><td></td><td></td>
<td>HUVEC</td><td> +/+/-</td><td></td><td> +/-</td><td> +/-</td><td></td>
<td colspan="6">Human breast cancer lines</td>
<td>BT474</td><td> +/++</td><td> +</td><td> 4-1-</td><td> +/++</td><td> +/++</td>
<td>MCF7</td><td> +</td><td> +</td><td> ++</td><td> +/+/-</td><td> +</td>
<td>MDA175</td><td></td><td> ++</td><td></td><td></td><td></td>
<td>MDA361</td><td> +/+/-</td><td></td><td></td><td></td><td> +</td>
<td>SKBR3</td><td></td><td> ++</td><td></td><td></td><td></td>
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<td colspan="6">Human lung cancer lines</td>
<td>A549</td><td></td><td></td><td></td><td></td><td></td>
<td>Calu3</td><td></td><td></td><td> +</td><td></td><td></td>
<td>SKMES1</td><td> +/++</td><td> +/-</td><td> +/++</td><td> +</td><td> +</td>
<td colspan="3">Cancer lines d</td><td colspan="3">e human ovary</td>
<td>ES-2</td><td></td><td></td><td></td><td></td><td></td>
<td>SKOV3</td><td> +</td><td></td><td></td><td></td><td> +/+/-</td>
<td colspan="6">Human pancreatic cancer lines</td>
<td>Panc-1</td><td> +/+/-</td><td></td><td> +</td><td> +/-</td><td> +/+/-</td>
<td>AsPC-1</td><td></td><td></td><td></td><td></td><td></td>
<td>HPAFII</td><td></td><td> +</td><td></td><td></td><td></td>
<td>Hs700T</td><td> +</td><td>-H- +</td><td> +++</td><td> +</td><td> +++</td>
<td colspan="6">Human colon cancer lines</td>
<td>Colo205</td><td></td><td> +</td><td></td><td></td><td></td>
<td>HT-29</td><td> +</td><td> +/+/-</td><td></td><td></td><td> +/+/-</td>
<td>SW480</td><td> +/-</td><td> +++</td><td></td><td></td><td></td>
<td>SW948</td><td> +/-</td><td> +</td><td></td><td></td><td></td>
<td colspan="6">Human kidney cancer lines</td>
<td> 293</td><td> +/+/-</td><td></td><td> +</td><td> +/+/-</td><td> +</td>
<td> 786-0</td><td> +</td><td></td><td> +*</td><td> +/-</td><td> +</td>
<td>A498</td><td> +</td><td></td><td> +/++</td><td></td><td>+/- H-</td>
<td>Caki2</td><td> ++</td><td> +</td><td>-m-</td><td> +/++</td><td>-H-</td>
<td colspan="6">Non-human cell lines</td>
<td>Cos7</td><td> +</td><td></td><td> +/+/- *</td><td> +/-</td><td></td>
<td>RL65</td><td></td><td></td><td></td><td></td><td></td>
<td>SVT2</td><td></td><td></td><td></td><td></td><td></td>
<td colspan="6">Human prostate cancer</td>
<td>22Rvl</td><td></td><td> +</td><td></td><td></td><td></td>
<td>DU145</td><td> +/-</td><td> +</td><td></td><td></td><td></td>
<td>LNCaP</td><td> +/+/-</td><td> +</td><td> +*</td><td> +/+/-</td><td> +</td>
<td>PC3</td><td></td><td></td><td></td><td></td><td></td>
<td>TDH</td><td></td><td> +++</td><td> +/-</td><td></td><td> +/-</td>
<td colspan="6">Human stomach cancer lines</td>
<td>HS746T</td><td> +</td><td></td><td> +/+/-</td><td> +/-</td><td> +/-</td>
<td>N87</td><td></td><td> +/+/-</td><td> +/-</td><td></td><td></td>
Example 4
MAbs against B7-H3 redirect destruction
The antibodies of the present invention bind to B7-H3 present on the surface of cancer cells. Using conventional methods, such antibodies can be labeled with fluorescein, as described above. When such labeled molecules are incubated in the presence of UDART ™ molecules that have an epitope-binding domain that binds to the T cell receptor and an epitope-binding domain that binds to fluorescein ("TCR124
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UDART ™ ”), can bind to DART ™ molecules and thus locate them on the surface of cells that express B7-H3 and cause redirected destruction.
A. Redirected destruction of A498 renal carcinoma cells
To demonstrate such redirected killing, fluorescein-labeled B7-H3 5 antibodies were incubated with such TCR-UDART ™ molecules and the ability of the molecules to mediate cytotoxicity of A498 renal carcinoma cells was evaluated (Table 17). Based on the results achieved, it was concluded that the main candidates were: RECA13, BRCA68D, BRCA69D and TDH6.
<td colspan="4">Table 17: Redirected destruction of A498 renal carcinoma cells</td>
<td>AcM</td><td>Without UDART ™</td><td>With TCRUDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>MFI</td>
<td>BCCA66</td><td> -1,04</td><td> 46,39</td><td> 43,30</td>
<td>BLA8</td><td> 1,35</td><td> 49,19</td><td> 50</td>
<td>BRCA165</td><td> 0</td><td> 5,11</td><td> 5,46</td>
<td>BRCA52</td><td> 0</td><td> 55,53</td><td> 41,7</td>
<td>BRCA68D</td><td> 0</td><td> 36,89</td><td> 83,7</td>
<td>BRCA69D</td><td> 0</td><td> 54,71</td><td> 84,1</td>
<td>BRCA84D</td><td> 0</td><td> 72,40</td><td> 30,6</td>
<td>GB8</td><td> 4,00</td><td> 42,00</td><td> 17,9</td>
<td>KIDl</td><td> 0,38</td><td> 52,08</td><td> 18,5</td>
<td>KID13</td><td> 26,39</td><td> 58,20</td><td></td>
<td>KID35</td><td> -1,68</td><td> 7,62</td><td></td>
<td>LUCA1</td><td> 9,85</td><td> 52,73</td><td> 52,9</td>
<td>OVCA21</td><td> -0,85</td><td> 47,59</td><td> 6,04</td>
<td>OVCA22</td><td> 0,36</td><td> 38,66</td><td> 53,9</td>
<td>OVCA25</td><td> -2,86</td><td> 16,70</td><td></td>
<td>PA40</td><td> -0,46</td><td> 40,54</td><td></td>
<td>PRCA123</td><td> 0</td><td> 56</td><td> 130</td>
<td>PRCA135</td><td> 0</td><td> 55</td><td> 127</td>
<td>PRCA157</td><td> 0</td><td> 39,14</td><td> 58,8</td>
<td>RECA13</td><td> 0</td><td> 38,62</td><td> 39,8</td>
<td>RECA22</td><td> -0,24</td><td> 51,74</td><td> 99,90</td>
<td>RECA9</td><td> 0</td><td> 62</td><td> 50,1</td>
<td>SAL3</td><td> 4,94</td><td> 52,23</td><td> 60,5</td>
<td>SG24</td><td> -2,25</td><td> 42,00</td><td></td>
<td>SG27</td><td> -3,98</td><td> 0,21</td><td></td>
<td>SKIN2</td><td> 3,11</td><td> 56,44</td><td> 45,8</td>
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<td colspan="2">Table 17: Destruction redir carcinoma rena</td><td colspan="2">A498 cell life ------</td>
<td>AcM</td><td>Without UDART ™</td><td>With TCRUDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>MFI</td>
<td>STO5</td><td> 2,91</td><td> 37,84</td><td> 36,7</td>
<td>TDH36</td><td> -1,03</td><td> 53,52</td><td> 155,00</td>
<td>TDH37</td><td> 0,05</td><td> 65,21</td><td> 47,50</td>
<td>TDH4</td><td> 5,09</td><td> 50,63</td><td> 45,9</td>
<td>TDH40</td><td> -0,65</td><td> 44,55</td><td></td>
<td>TDH5</td><td> 2,92</td><td> 49,60</td><td> 28,8</td>
<td>TDH6</td><td> 0</td><td> 70,10</td><td> 19,5</td>
<td>TES7</td><td> 6,23</td><td> 52,89</td><td> 17,5</td>
A498 renal carcinoma cells were incubated with different concentrations of monoclonal antibodies reactive against B7-H3 in order to determine the dose-dependent redirected killing mediated by the antibodies. The results of the experiments (Figures 3A-3B) show that the redirected killing was dose dependent.
B. Redirected destruction of A549 lung cancer cells
To further demonstrate such redirected killing, fluorescein-labeled B7-H3 antibodies were incubated with the TCR-UDART ™ molecules described above or with UDART ™ molecules that had a CD16-binding epitope-binding domain and a CD16-binding domain. binding to fluorescein-binding epitope ("CD16-UDART ™"), and the ability of the molecules to mediate the cytotoxicity of A549 lung cancer cells was evaluated (Table 18). The results of the experiments (Figures 3C-3D) show that the redirected killing was dose dependent. Based on the results achieved, it was concluded that the main candidates were: BLA8, BRCA68D, BRCA69D and BRCA84D.
<td colspan="5">Table 18: Targeted destruction of A549 lung cancer cells</td>
<td>AcM</td><td>Without DART ™</td><td>With TCRUDART ™</td><td>With CD16UDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>Half</td><td>MFI</td>
<td>BCCA66</td><td> 1,89</td><td> 25,17</td><td> 8,22</td><td> 36,1</td>
<td>BLA8</td><td> -7,70</td><td> 10,97</td><td> 3,68</td><td> 34,7</td>
<td>BRCA52</td><td> 0</td><td> 27,63</td><td></td><td> 37</td>
<td>BRCA68D</td><td> -4,42</td><td> 13,45</td><td> 15,95</td><td> 58,3</td>
<td>BRCA69D</td><td> 0</td><td> 24,25</td><td></td><td> 60,5</td>
<td>BRCA84D</td><td> 0</td><td> 15,33</td><td></td><td> 25</td>
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<td colspan="5">Table 18: Redirected destruction of A549 lung cancer cells -----</td>
<td>AcM</td><td>Without DART ™</td><td>With TCRUDART ™</td><td>With CD16UDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>Half</td><td>MFI</td>
<td>GB8</td><td> -8,68</td><td> 2,44</td><td> -4,65</td><td> 17</td>
<td>KID1</td><td> 0</td><td> 22,93</td><td></td><td> 41</td>
<td>LUCA1</td><td> 0</td><td> 14,65</td><td></td><td> 53</td>
<td>OVCA21</td><td> -2,43</td><td> 18,90</td><td> 7,22</td><td> 31,5</td>
<td>OVCA22</td><td> 0</td><td> 32,90</td><td></td><td> 61</td>
<td>PRCA123</td><td> 7,68</td><td> 29,88</td><td> 17,31</td><td> 79,4</td>
<td>PRCA135</td><td> -6,58</td><td> 22,72</td><td> 8,14</td><td> 75,6</td>
<td>PRCA157</td><td> 0,02</td><td> 18,63</td><td> 18,24</td><td> 44,3</td>
<td>PSMA</td><td> -0,70</td><td> 5,58</td><td> 9,94</td><td></td>
<td>RECA13</td><td> 0,86</td><td> 17,39</td><td> 11,90</td><td> 34,4</td>
<td>RECA22</td><td> 3,71</td><td> 20,49</td><td> 19,35</td><td> 74,3</td>
<td>RECA9</td><td> 7,01</td><td> 26,89</td><td> 31,80</td><td> 44,3</td>
<td>SAL3</td><td> 0</td><td> 31,80</td><td></td><td> 67,4</td>
<td>SKIN2</td><td> -0,08</td><td> 8,65</td><td> 9,33</td><td> 41,9</td>
<td>STO5</td><td> -10,36</td><td> 9,28</td><td> 1,71</td><td> 54,7</td>
<td>TDH36</td><td> 6,79</td><td> 24,12</td><td> 24,08</td><td> 107</td>
<td>TDH37</td><td> 6,93</td><td> 22,57</td><td> 23,37</td><td> 42,3</td>
<td>TDH4</td><td> -6,26</td><td> 10,07</td><td> 2,21</td><td> 32,4</td>
<td>TDH40</td><td> 4,87</td><td> 22,01</td><td> 24,90</td><td> 53,3</td>
<td>TDH5</td><td> -5,08</td><td> 9,35</td><td> -2,85</td><td> 27,1</td>
<td>TDH6</td><td> 0</td><td> 19,09</td><td></td><td> 21,3</td>
<td>TES7</td><td> 0</td><td> 19,35</td><td></td><td> 15,7</td>
C. Redirected destruction of LNcap prostate cancer cells
To further demonstrate such redirected killing, fluorescein-labeled B7-H3 antibodies were incubated with the TCR-UDART ™ molecules described above or with UDART ™ molecules that had a CD16-binding epitope-binding domain and a CD16-binding domain. binding to fluorescein-binding epitope ("CD16-UDART ™"), and the ability of the molecules to mediate cytotoxicity of LNcap prostate cancer cells was evaluated (Table 19). Based on the results achieved, it was concluded that the main candidates were: BRCA68D, BRCA69D, BRCA84D and PRCA 157.
<td colspan="5">Table 19: Targeted Destruction of LNcap Prostate Cancer Cells</td>
<td>AcM</td><td>Without DART ™</td><td>With TCRUDART ™</td><td>With CD16UDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>Half</td><td>MFI</td>
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<td colspan="5">Table 19: Targeted Destruction of LNcap Prostate Cancer Cells</td>
<td>AcM</td><td>Without DART ™</td><td>With TCRUDART ™</td><td>With CD16UDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>Half</td><td>MFI</td>
<td>BCCA4</td><td> -2,96</td><td> 13,29</td><td> 2,47</td><td> 5,1</td>
<td>BCCA66</td><td> -2,13</td><td> 13,42</td><td> 16,40</td><td> 41</td>
<td>BLA8</td><td> 4,32</td><td> 14,97</td><td> 24,00</td><td> 48,4</td>
<td>BRCA165</td><td> 3,59</td><td> 57,26</td><td> 12,02</td><td> 7,6</td>
<td>BRCA183D</td><td> -4,65</td><td> 43,09</td><td> 35,30</td><td> 7,6</td>
<td>BRCA52</td><td> 32,34</td><td> 71,23</td><td> 48,28</td><td> 42,5</td>
<td>BRCA68D</td><td> -1,40</td><td> 23,00</td><td> 21,91</td><td> 86,9</td>
<td>BRCA69D</td><td> 40,08</td><td> 78,02</td><td> 60,55</td><td> 92,4</td>
<td>BRCA84D</td><td> 20,11</td><td> 78,70</td><td> 41,27</td><td> 16,4</td>
<td>GB8</td><td> -6,25</td><td> 14,04</td><td> 10,76</td><td> 22</td>
<td>KID1</td><td> 54,65</td><td> 91,87</td><td> 67,86</td><td> 44,8</td>
<td>KID13</td><td> 15,86</td><td> 69,21</td><td> 47,85</td><td></td>
<td>KID133</td><td> 27,51</td><td> 45,65</td><td> 47,12</td><td> 120</td>
<td>KID24</td><td> -4,26</td><td> 34,13</td><td> 41,17</td><td> 14,5</td>
<td>KID35</td><td> 14,17</td><td> 64,01</td><td> 33,05</td><td></td>
<td>KID47</td><td> 11,34</td><td> 39,49</td><td> 15,02</td><td> 10,8</td>
<td>KID8</td><td> 16,98</td><td> 58,80</td><td> 34,77</td><td> 5,5</td>
<td>LUCA1</td><td> 47,40</td><td> 89,31</td><td> 67,15</td><td> 73</td>
<td>LUCA17</td><td> 23,18</td><td> 26,90</td><td> 35,87</td><td> 11,1</td>
<td>LUCAT1</td><td> 8,25</td><td> 22,36</td><td> 21,49</td><td> 6,9</td>
<td>LUCAT7</td><td> 26,50</td><td> 38,29</td><td> 44,77</td><td> 8,7</td>
<td>MCL12</td><td> 26,62</td><td> 35,59</td><td> 46,38</td><td> 17,6</td>
<td>MEL2</td><td> 6,57</td><td> 29,90</td><td> 31,40</td><td> 19</td>
<td>OVCA21</td><td> 12,07</td><td> 26,81</td><td> 31,30</td><td> 41</td>
<td>OVCA22</td><td> 45,09</td><td> 96,50</td><td> 77,30</td><td> 113</td>
<td>OVCA25</td><td> 16,14</td><td> 63,26</td><td> 32,39</td><td></td>
<td>PA22</td><td> 1,73</td><td> 57,70</td><td> 9,89</td><td> 8,9</td>
<td>PA33</td><td> 8,99</td><td> 34,49</td><td> 48,14</td><td> 9,4</td>
<td>PA40</td><td> 38,42</td><td> 73,07</td><td> 63,65</td><td></td>
<td>PRCA123</td><td> 9,96</td><td> 14,39</td><td> 18,38</td><td> 125</td>
<td>PRCA135</td><td> -3,75</td><td> 8,89</td><td> 13,64</td><td> 123</td>
<td>PRCA157</td><td> 1,05</td><td> 17,07</td><td> 15,43</td><td> 16,4</td>
<td>PSMA</td><td> 11,52</td><td> 31,38</td><td> 34,79</td><td></td>
<td>PSMA</td><td> 52,82</td><td> 71,19</td><td> 66,04</td><td></td>
<td>RECA13</td><td> 5,86</td><td> 22,55</td><td> 15,40</td><td> 37</td>
<td>RECA22</td><td> 7,33</td><td> 24,65</td><td> 23,54</td><td> 22,5</td>
<td>RECA9</td><td> 27,67</td><td> 52,54</td><td> 45,14</td><td> 5,3</td>
<td>I LEFT</td><td> 2,76</td><td> 17,87</td><td> 44,52</td><td> 6,5</td>
<td>SAL2</td><td> 8,71</td><td> 30,68</td><td> 29,17</td><td> 14,5</td>
<td>SAL3</td><td> 43,79</td><td> 92,60</td><td> 76,46</td><td> 105</td>
<td>SG24</td><td> 12,64</td><td> 66,82</td><td> 44,99</td><td></td>
<td>SG27</td><td> 1,37</td><td> 55,30</td><td> 16,96</td><td></td>
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<td colspan="5">Table 19: Targeted Destruction of LNcap Prostate Cancer Cells</td>
<td>AcM</td><td>Without DART ™</td><td>With TCRUDART ™</td><td>With CD16UDART ™</td><td>FACS</td>
<td></td><td>Half</td><td>Half</td><td>Half</td><td>MFI</td>
<td>SKIN2</td><td> -2,04</td><td> 14,81</td><td> 24,23</td><td> 73,8</td>
<td>SPL16</td><td> 9,97</td><td> 29,90</td><td> 23,74</td><td> 5,2</td>
<td>STO5</td><td> -1,48</td><td> 21,11</td><td> 24,97</td><td> 61,3</td>
<td>TDH28</td><td> -4,23</td><td> 18,55</td><td> 15,04</td><td> 13,3</td>
<td>TDH36</td><td> 3,58</td><td> 19,61</td><td> 19,79</td><td> 199</td>
<td>TDH37</td><td> 7,90</td><td> 18,78</td><td> 25,22</td><td> 57,3</td>
<td>TDH4</td><td> 14,48</td><td> 37,96</td><td> 54,64</td><td> 45,2</td>
<td>TDH40</td><td> 8,51</td><td> 44,55</td><td> 43,87</td><td> 79,3</td>
<td>TDH5</td><td> 7,35</td><td> 48,71</td><td> 38,15</td><td> 29,1</td>
<td>TDH6</td><td> 4,50</td><td> 54,59</td><td> 19,73</td><td> 41,7</td>
<td>TES7</td><td> 50,15</td><td> 94,47</td><td> 73,40</td><td> 22,4</td>
Example 5
Ability of mAb against B7-H3 to bind soluble B7H3-2Ig and soluble B7H3-4Ig
As discussed above, B7-H3 exists both in a form containing 4 Ig domains (B7H3 ~ 4Ig) and in a form containing 2 Ig domains (B7H3-2Ig). The anti-B7-H3 antibodies of the present invention were tested for their abilities to bind soluble B7H3-2Ig (Figure 4A) and soluble B7H3-4Ig (Figure 4B) to B7-H3. The antibodies were found to show a wide range of binding characteristics. Antibodies PRCA123, TDH5, BLA8, BRCA68D and SG24 were found to show the strongest binding to soluble B7H3-2Ig and antibodies TES7, LUCA50, BRCA165, OVCA22, STO9 and PA20 were found to show the weakest binding to B7H3- 2Ig soluble. Antibodies PRCA123, BRCA69A, BLA8 and BRCA68D were found to show the strongest binding to soluble B7H34Ig and antibodies TES7, OVCA21, BRCA165 and STO9 were found to show the weakest binding to soluble B7H3-4Ig.
Example 6
Affinity binding of antigens in solution to captured monoclonal antibodies
In order to demonstrate the binding affinity between antigens in solution and captured monoclonal antibodies, antibodies were captured on immobilized IgG Fe-specific Fab2 fragments at a level of 100-200 RU. B7-H3 and B7-H3 antigens (4Ig) were injected onto the captured antibodies at a concentration of 100 nM (flow rate 20 μΐ / min for 120 sec., And binding was measured. Binding responses were normalized to same level of
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Captured mAb and the antibody control m2B6 (mlgGl) binding response was subtracted as blank. The results of this analysis (Figures 5A-5S; solid lines; B7-H3 (4Ig) 100 nM; dashed lines; B7-H3, 100 nM)) demonstrate that the antibodies of the present invention show strong binding to B7-H3 (4Ig).
Example 7
BIACORE ™ analysis: titration of mAb against B7-H3 versus immobilized B7-H3
In order to demonstrate the relative binding affinities of B7-H3-2Ig and B7-H3-4Ig for the antibodies of the present invention, a BIACORE ™ analysis was performed. Antibodies to B7-H3 of the present invention were allowed to bind to immobilized B7-H3-2Ig or B7-H3-4Ig and the binding titer was evaluated over time (Figures 6A-6I). TDH5, PRCA123, BLA8, BRCA69 were found to have high affinity against both B7-H3-2Ig and B7-H3-4Ig. However its epitope (s) were found to be mainly blocked on the B7-H3-4Ig molecule, with only a few being available. OVCA22 was found to have a very low affinity for both B7-H3-2Ig and B7-H3-4Ig, its epitope being equally available on both molecules. However, it is likely that only the B7-H3-4Ig form provides sufficient proximity for bivalent antibody binding (low dissociation constant), whereas B7-H3-2Ig can only bind monovalently. TDH6 was found to have almost no affinity in this format, with binding to 2Ig probably not specific. TES7 and PA20 were found to be specific antibodies against B7-H4-4Ig with low affinity. TES7 probably has a low association constant and a dissociation constant greater than PA20. BRCA84D was found to be an intermediate affinity antibody with a possibility of multiple binding sites on both B7-H3-2Ig and B7-H34Ig. Based on the BIACORE ™ analysis, BRCA84D was considered a preferred antibody due to its unusual binding site. TES7 and PA20 were considered to be candidates for specific binding to surfaces with high density antigen, and one of the high affinity, low specificity antibodies (eg BRCA69D or other).
Figure 7 provides a comparison BIACORE ™ analysis of PRCA 15 7, BRCA69D, BLA8, PA20, BRCA84D, GB8 and SG27 antibodies, illustrating that the anti-B7-H3 antibodies of the present invention can display a range of properties. of Union.
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Figure 8 demonstrates the non-competition specificity of several of the anti-B7-H3 antibodies of the present invention. In the experiment, human B7-H3 molecules were incubated in the presence of BRCA84D antibody and subjected to BIACORE ™ analysis. After approximately 3 minutes a second anti-B7-H3 antibody was added to the reaction. If the second antibody competed with BRCA84D, it would find the occluded B7-H3 sites and could not bind. The results indicate that BRCA68D, BRCA69D and PRCA 157 do not compete with BRCA84D to bind human B7-H3.
Example 8
Anti-B7-H3 mAbs are internalized in CSC and ATCC cell lines
The ability of the anti-B7-H3 antibodies of the present invention to internalize after binding to cancer cells was investigated. Prostate CSC cells and Hs700t pancreatic cells were incubated with an anti-B7-H3 antibody. Cell viability was determined after incubation in the presence of an anti-mouse saporin-conjugated secondary antibody that will be toxic to cells if it binds to the primary antibody and is internalized. The results of this investigation for prostate CSC cells (Figure 9A) and for Hs700t pancreatic cells (Figure 9B) demonstrate the ability of the antibodies of the present invention to internalize into cells.
Example 9
Analysis of binding of mAb against B7-H3 and cross-blocking by ELISA
In order to explore the cross-reactivity of the antibodies of the present invention and the epitopes recognized by such antibodies, the degree of binding that occurred in the presence of a competitor B7-H3 antibody was measured. The results of this analysis are shown in Figures 10A-10F, and show that BRCA68D competes with BRCA69D. TES7 and OVCA22 were also found to compete with each other, but TES7 and not OVCA22 were also found to compete with both BRCA68D and BRCA69D. GB8 was found to compete with SG27 to bind B7-H3-2Ig but not B7-H3-4Ig. The data is summarized in Table 20 and shows at least four distinct epitopes for B7-H3-4Ig (i.e. the epitope recognized by SG27, the epitope recognized by GB8, the epitope recognized by OVCA22 and TES7, and the epitope recognized by BRCA68D, BRCA69D and TES7) and at least two epitopes for B7-H3-2Ig (ie the epitope recognized by SG27 and GB8, and the epitope recognized by BRCA68D and BRCA69D).
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<td colspan="9">Table 20 —--------------- Summary of cross-blocking analysis of mAb versus B7-H3 by ELISA</td>
<td rowspan="3">Antibody 0 competed r</td><td colspan="8">Antibody (Percentage of binding against MIgG)</td>
<td colspan="5">B7-H3 4Ig</td><td></td><td colspan="2">B7-H3-2Ig</td>
<td>GB8</td><td>BRCA 69D</td><td>BRCA 68D</td><td>TES7</td><td>OVCA 22</td><td>GB8</td><td>BRCA 69D</td><td>BRCA 68D</td>
<td>GB8</td><td> 50,211</td><td> 119,10 5</td><td> 108,94 8</td><td> 87,480</td><td> 98,142</td><td> 26,618</td><td> 84,408</td><td> 94,710</td>
<td>TES7</td><td> 111,23 4</td><td> 109,39 0</td><td> 108,42 5</td><td> 1,605</td><td> 16,268</td><td> 100,64 5</td><td> 90,734</td><td> 99,515</td>
<td>OVCA22</td><td> 121,78 3</td><td> 112,32 2</td><td> 100,81 3</td><td>3,371Ρ</td><td>L¿048r</td><td> 100,42 3</td><td> 87,991</td><td> 102,76 6</td>
<td>TDH6</td><td> 105,59 1</td><td> 105,06 5</td><td> 100,49 4</td><td> 99,839</td><td> 96,701</td><td> 100,08 <sup>9</sup></td><td> 66,086</td><td> 100,72 8</td>
<td>SG27</td><td> 101,26 6</td><td> 103,02 1</td><td> 97,763</td><td> 78,331</td><td> 87,789</td><td>64¿2W<sup>4</sup>Í</td><td> 89,927</td><td> 94,225</td>
<td>BRCA68D</td><td> 105,93 4</td><td> 40,284</td><td> 43,144</td><td>Xsir</td><td> 102,65 5</td><td> 98,888</td><td> 7,635?</td><td> 7,425 '</td>
<td>BRCA69D</td><td> 102,55 8</td><td>6 or £ R-</td><td> 71,441</td><td> 4,334</td><td> 96,928</td><td> 94,952</td><td> 17,346</td><td> 17,059</td>
<td>MIgG</td><td> 100,00 0</td><td> 100,00 0</td><td> 100,00</td><td> 100,00 0</td><td> 100,00 0</td><td> 100,00 0</td><td> 100,00 0</td><td> 100,00 0</td>
The attributes of the key anti-B7-H3 antibodies of the present invention are shown in Table 21. Based on their shown differential staining of normal and cancerous tissues, their ability to bind B7-H3-4Ig as well as B7-H3 -2Ig, its binding affinities as measured by the BIACORE ™ assay described above, and its ability to bind to cynomolgus B7H3, BRCA68D, BRCA69D, BRCA84D and PRCA157 antibodies were considered to be the most preferred antibodies.
<td colspan="10">Table 21</td>
<td>AcM</td><td>BRC A 84D</td><td>TDH 6</td><td>TES 7</td><td>BRC A 68D</td><td>BRC A 69D</td><td>GB 8</td><td>SG 27</td><td>OVCA 22</td><td>PRCA 157</td>
<td>Isotype</td><td>Gl / k</td><td>Gl / k</td><td>Gl / k</td><td>Gl / k</td><td>Gl / k</td><td>Gl / k</td><td>2b / k</td><td>Gl / k</td><td>Gl / k</td>
<td>IHC</td><td>2nd</td><td>2nd</td><td>2nd</td><td>2b</td><td>2b</td><td>2b</td><td>2b</td><td>2 C</td><td>2 C</td>
<td>Network of ATCC</td><td> 2</td><td> 1</td><td> 1</td><td> 3</td><td> 3</td><td> 3</td><td> 1</td><td> 3</td><td> 2</td>
<td colspan="10">Normal fabric</td>
<td>Colon</td><td> 1+</td><td> 1+</td><td></td><td></td><td> 1+</td><td></td><td> 1+</td><td> 2+</td><td> 2+</td>
<td>Lung</td><td> 1+</td><td> 1+</td><td></td><td> 1+</td><td></td><td></td><td></td><td></td><td></td>
<td>Liver</td><td> 1+</td><td> 1+</td><td></td><td> 2+</td><td> 2+</td><td></td><td> 1+</td><td> 2+</td><td> 2+</td>
<td>Kidney</td><td></td><td> 1+</td><td></td><td> 1+</td><td> 1+</td><td></td><td> 1+</td><td></td><td></td>
<td>Pancreas</td><td></td><td> 1+</td><td></td><td> 1+</td><td></td><td></td><td> 1+</td><td> 2+</td><td></td>
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<td colspan="10">Table 21 __, ______________</td>
<td>AcM</td><td>BRC A 84D</td><td>TDH 6</td><td>TES 7</td><td>BRC A 68D</td><td>BRC A 69D</td><td>GB 8</td><td>SG 27</td><td>OVCA 22</td><td>PRCA 157</td>
<td>Skin</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td> 2+</td>
<td colspan="10">Cancerous tissue</td>
<td>Colon</td><td> 1231 *</td><td> 1110 ★</td><td> 1,5</td><td> 2321 *</td><td> 2231*</td><td></td><td> 1221*</td><td> 1122</td><td> 2231*</td>
<td>Lung</td><td> 1130</td><td> 1010</td><td> 1,75</td><td> 3332</td><td> 3231</td><td></td><td> 112 0</td><td> 3131**</td><td> 3231</td>
<td>Prostate</td><td> 112</td><td> 111</td><td> 3</td><td> 333</td><td> 333</td><td></td><td> 222</td><td> 222</td><td> 333</td>
<td>Mother</td><td>lili</td><td> 1011</td><td> 3</td><td> 3333</td><td> 3333</td><td></td><td> 112 2</td><td> 3233</td><td> 2333</td>
<td>Internalization</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td>
<td>U-DART ™</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td><td> +</td>
<td>Specificity</td><td>4Ig 2Ig</td><td>4Ig 2Ig</td><td>4Ig</td><td>4Ig twenty-one?</td><td>4Ig 2Ig</td><td>4Ig 2Ig</td><td>4Ig 2Ig</td><td>4Ig</td><td>4Ig 2Ig</td>
<td>Epitope group</td><td>TO</td><td>B</td><td>C</td><td>D</td><td>D</td><td>AND</td><td>F</td><td>G</td><td>H</td>
<td>BIACORE TM</td><td> +</td><td> +/-</td><td> +</td><td> ++</td><td>-H-</td><td> +</td><td> +</td><td> +</td><td> +/-</td>
<td>B7-H3 binding of cynomolgus</td><td> ++</td><td> +</td><td></td><td> ++</td><td> ++</td><td> ++</td><td> +</td><td> +</td><td> ++</td>
<td colspan="10">Notes: * Indicates stromal staining ** Stromal staining 3+</td>
Example 10
Humanized anti-B7-H3 antibodies
The BRCA84D monoclonal antibody was humanized to produce antibodies (generically referred to as "hBRCA84D" herein) that offer enhanced therapeutic potential in humans. The sequences of the variable light chain, and the variable heavy chain, and their respective amino acid and polynucleotide sequences of a resulting humanized antibody (referred to as "hBRCA84D-1" herein) are provided below:
Variable light chain from humanized BRCA84D-1 (SEQ ID NO: 68):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GKAPKLLIYS
ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ GTKLEIK
Polynucleotide sequence encoding the variable light chain of humanized BRCA84D-1 (SEQ ID NO: 69):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga
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Mexican INSTITUTE OF INDUSTRIAL cagagtgacc MIOOTEDAB atcacatgca aggcctccca gaacgtggac accaacgtgg____ cctggtatca gcagaagcct ggcaaggccc ctaagctgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa g
Humanized BRCA84D-1 Variable Light Chain CDRi (SEQ ID NO: 70): KASQNVDTNVA
Polynucleotide sequence encoding the CDR, of the variable light chain of humanized BRCA84D-1 (SEQ ID NO: 71): aaggccagtc agaatgtgga tactaatgta gcc
Humanized BRCA84D-1 Variable Light Chain CDR2 (SEQ ID NO: 72):
SASYRYS
Polynucleotide sequence encoding humanized BRCA84D-1 variable light chain CDR2 (SEQ ID NO: 73): tcggcatcct accggtacag t
CDR<sub>3</sub> variable light chain of humanized BRCA84D-1 (SEQ ID NO: 74): QQYNNYPFT
Polynucleotide sequence encoding the CDR<sub>3</sub> variable light chain of humanized BRCA84D-1 (SEQ ID NO: 75): cagcaatata acaactatcc attcacg
Variable heavy chain amino acid sequence of humanized BRCA84D-1 (SEQ ID NO: 80):
EVQLVESGGG LVQPGGSLRL SCAASGFTFS SFGMHWVRQA PGKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNAKNSLY LQMNSLRDED TAVYYCARGR ENIYYGSRLD YWGQGTTVTV SS
Polynucleotide sequence encoding the variable heavy chain of humanized BRCA84D-1 (SEQ ID NO: 81): gaggtgcagc tggtcgagtc tggcggagga ctggtgcagc ctggcggctc cctgagactg tcttgcgccg cctccggctt caccttctcc agcttcggca tgcactgggt ccgccaggct ccaggcaagg gactggaatg ggtggcctac atctcctccg to ctcctccgc catctactac gccgacaccg tgaagggcag gttcaccatc tcccgggaca acgccaagaa ctccctgtac ctgcagatga actccctgcg ggacgaggac accgccgtgt actactgcgc cagaggccgg gagaatatct actacggctc ccggctggat tattggggcc agggcaccac cgtgaccgtg tcctct
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Humanized BRCA84D-1 variable heavy chain CDRj (SEQ ID NO: 82):
FGMH
Polynucleotide sequence encoding humanized BRCA84D-1 variable heavy chain CDRi (SEQ ID NO: 83): tttggaatgcac
Humanized BRCA84D variable heavy chain CDR2 (SEQ ID NO: 84):
YISSDSSAIYYADTVK
Polynucleotide sequence encoding humanized BRCA84D-1 variable heavy chain CDR2 (SEQ ID NO: 85): tacattagta gtgacagtag tgccatctac tatgcagaca cagtgaag
Humanized BRCA84D-1 variable heavy chain CDR3 (SEQ ID NO: 86):
GRENIYYGSRLDY
Polynucleotide sequence encoding humanized BRCA84D-1 variable heavy chain CDR3 (SEQ ID NO: 87): gggagggaaa acatttacta cggtagtagg cttgactac
Figures 11A-1 IB show the alignment of amino acid residues of the variable light chains (Figure 11A) or variable heavy chains (Figure 11B) of BRCA84D and its humanized derivative, hBRCA84D.
In order to obtain hBRCA84D species showing enhanced affinity for human B7-H3, the polynucleotides encoding the hBRCA84D-1 heavy or light chains (i.e., hBRCA84D-lVL or hBRCA84D-lVH, respectively) were subjected to mutagenesis. , and the light chain derivatives of hBRCA84D-l mutated hBRCA84D2VL, hBRCA84D-3VL, hBRCA84D-4VL, hBRCA84D-5VL and hBRCA84D-6VL and heavy chain derivatives of hBRCA84D-l mutated hBRCA84D-2VH, hBRCA84D-2VH, hBRCA84D-2VH, hBRCA84D-2 hBRCA84D4VH. The amino acid and polynucleotide sequences of the variable heavy and light chains of these antibodies are presented below:
hBRCA84D-2VL (SEQ ID NO: 89):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GKAPKALIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ GTKLEIK
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Polynucleotide encoding hBRCA84D-2VL (SEQ ID NO: 90):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtar or atcacatgca aggcctccca gaacgtggac accaacgtgg cctggt. ja gcagaagcct ggcaaggccc ctaaggcgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccagctaccaccaccag cgtgccttcc AGgttctccg 91 gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccagcaccaccacca
DIQLTQSPSF LSASVGDRVS VTCKASQNVD TNVAWYQQKP GKAPKLLIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ GTKLEIK
Polynucleotide encoding hBRCA84D-3VL (SEQ ID NO: 92):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgtcc gtcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggcaaggccc ctaagctgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa g hBRCA84D-4VL (SEQ ID NO: 93):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GQAPKLLIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ GTKLEIK
Polynucleotide encoding hBRCA84D-4VL (SEQ ID NO: 94):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgacc atcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggccaggccc ctaagctgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa g hBRCA84D-5VL (SEQ ID NO: 95):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GQAPKALIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ GTKLEIK
Polynucleotide encoding hBRCA84D-5VL (SEQ ID NO: 96):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgacc atcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggccaggccc ctaaggcgct gatctact cgccgcctcctat gccgcctccc
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INDUSTRIAL tggcaccgac ttcaccctga ccatctccag cctqcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac ctt'cggcca ^<sup>1 </sup>ggcaccaagc tggaaatcaa g hBRCA84D-6VL (SEQ ID NO: 97):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GKAPKLLIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFAEYYCQQ YNNYPFTFGQ GTKLEIK
Polynucleotide encoding hBRCA84D-6VL (SEQ ID NO: 98):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgacc atcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggcaaggccc ctaagctgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccgagtacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa g hBRCA84D-2VH (SEQ ID NO: 99):
EVQLVESGGG LVQPGGSLRL SCAASGFTFS SFGMHWVRQA PGKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNAKNSLY LQMNSLRDED TAVYYCGRGR ENIYYGSRLD YWGQGTTVTV SS
Polynucleotide encoding hBRCA84D-2VH (SEQ ID NO: 100):
gaggtgcagc tggtcgagtc tggcggagga ctggtgcagc ctggcggctc cctgagactg tcttgcgccg cctccggctt caccttctcc agcttcggca tgcactgggt ccgccaggct ccaggcaagg gactggaatg ggtggcctac atctcctccg actcctccgc catctactac gccgacaccg tgaagggcag gttcaccatc tcccgggaca acgccaagaa ctccctgtac ctgcagatga actccctgcg ggacgaggac accgccgtgt actactgcgg cagaggccgg gagaatatct actacggctc ccggctggat tattggggcc agggcaccac cgtgaccgtg tcctct hBRCA84D-3HV (SEQ ID NO: 101):
EVQLVESGGG LVQPGGSLRL SCAASGFTFS SFGMHWVRQA PGKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNAKNSLY LQMNSLRDED TAMYYCGRGR ENIYYGSRLD YWGQGTTVTV SS
Polynucleotide encoding hBRCA84D-3VH (SEQ ID NO: 102):
gaggtgcagc tggtcgagtc tggcggagga ctggtgcagc ctggcggctc cctgagactg tcttgcgccg cctccggctt caccttctcc agcttcggca tgcactgggt ccgccaggct ccaggcaagg gactggaatg ggtggcctac atctcctccg actcctccgc catctactac gccgacaccg tgaagggcag gttcaccatc tcccgggaca acgccaagaa ctccctgtac ctgcagatga actccctgcg ggacgaggac accgccatgt actactgcgg cagaggccgg gagaatatct actacggctc ccggctggat tattggggcc agggcaccac cgtgaccgtg tcctct
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INSTITUTO MIXICANO MUAtROMMAD INDUSTRIAL hBRCA84D-4VH (SEQ ID NO: 103): -_________
EVQLVESGGG LVQPGGSLRL SCAASGFTFS SFGMHWVRQA PGKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNAKNSLY LQMNSLRSED TAVYYCARGR ENIYYGSRLD YWGQGTTVTV SS
Polynucleotide encoding hBRCA84D-4VH (SEQ ID NO: 104):
gaggtgcagc cctgagactg tgcactgggt atctcctccg gttcaccatc actccctgcg gagaatatct cgtgaccgtg tggtcgagtc tcttgcgccg ccgccaggct actcctccgc tcccgggaca gagcgaggac actacggctc tcctct tggcggagga cctccggctt ccaggcaagg catctactac acgccaagaa accgccgtgt ccggctggat ctggtgcagc caccttctcc gactggaatg gccgacaccg ctccctgtac actactgcgc tattggggcc ctggcggctc agcttcggca ggtggcctac tgaagggcag ctgcagatga cagaggccgg agggcaccac
Table 22 indicates the hBRCA84D variable light chain and variable heavy chain mutations studied; the numbers refer to the Kabat numbering system used in Figures HA and 11B.
<td colspan="10">Table 22</td>
<td colspan="6">Variable light chain</td><td colspan="4">Variable heavy chain</td>
<td>Kabat's position</td><td> 20</td><td> 21</td><td> 42</td><td> 46</td><td> 85</td><td>Kabat's position</td><td> 84</td><td> 89</td><td> 93</td>
<td>BRCA84D</td><td>S</td><td>V</td><td>Q</td><td>TO</td><td>AND</td><td>BRCA84D</td><td>S</td><td>M</td><td>G</td>
<td>hBRCA84D-lVL</td><td>T</td><td>I</td><td>K</td><td>L</td><td>T</td><td>hBRCA84D1VH</td><td>D</td><td>V</td><td>TO</td>
<td>hBRCA84D-2VL</td><td>T</td><td>I</td><td>K</td><td>TO .</td><td>T</td><td>hBRCA84D2VH</td><td>D</td><td>V</td><td>G f</td>
<td>hBRCA84D-3VL</td><td>s</td><td>V</td><td>K</td><td>L</td><td>T</td><td>hBRCA84D3VH</td><td>D</td><td>M</td><td>G</td>
<td>hBRCA84D-4VL</td><td>T</td><td>I</td><td>Q</td><td>L</td><td>T</td><td>hBRCA84D4VH</td><td>S</td><td>V</td><td>TO</td>
<td>hBRCA84D-5VL</td><td>T</td><td>I</td><td>Q</td><td>TO</td><td>T</td><td></td><td></td><td></td><td></td>
<td>hBRCA84D-6VL</td><td>T</td><td>I</td><td>K</td><td>L</td><td>. AND</td><td></td><td></td><td></td><td></td>
The relative binding affinities of the hBRCA84D light chain derivatives hBRCA84D-3VL, hBRCA84D-4VL and hBRCA84D-5VL were determined for human B7-H3 by forming antibodies containing these light chain variable regions and a chimeric BRCA84D-1VH heavy chain ( figure 12). BRCA84D-5VL (K42Q, L46A) was found to have the 138
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INSTITUTO MUtCANO Di LA PROPERTY INDUSTRIAL Higher binding affinity of the hBRCA84D-VL tested. Therefore, BRCA84D-5VL was used as the light chain to investigate the relative binding affinities of the hBRCA84D heavy chains of hBRCA84D-lVH, hBRCA84D-2VH, hBRCA84D-3VH, and hBRCA84D-4VH for
Human B7-H3 (Figure 13). HBRCA84D-2VH (A93G) was found to have the highest binding affinity of the hBRCA84D-VH tested.
The amino acid and coding polynucleotide sequences of chimeric BRCA84D-1 are as follows:
ChBRCA84D light chain (SEQ ID NO: 105):
DIAMTQSQKF MSTSVGDRVS VTCKASQNVD TNVAWYQQKP GQSPKALIYS
ASYRYSGVPD RFTGSGSGTD FTLTINNVQS EDLAEYFCQQ YNNYPFTFGS
GTKLEIKRTV AAPSVFIFPP SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC
Polynucleotide encoding the chBRCA84D light chain (SEQ ID NO: 106):
gacattgcga tgacccagtc tcaaaaattc atgtccacat cagtaggaga cagggtcagc aggccagtca gtcacctgca gaatgtggat actaatgtag acagaaacca cctggtatca gggcaatctc ctaaagcact gatttactcg gcatcctacc ggtacagtgg agtccctgat cgcttcacag gcagtggatc tgggacagat ttcactctca ccatcaacaa tgtgcagtct gaagacttgg cagagtattt ctgtcagcaa tataacaact atccattcac gttcggctcg gctgcaccat ctgtcttcat gggacaaagt tggaaataaa acgtacggtg agttgaaatc tggaactgcc tctgttgtgt cttcccgcca tctgatgagc cccagagagg ccaaagtaca gtggaaggtg gcctgctgaa taacttctat gataacgccc tccaatcggg taactcccag gagagtgtca cagagcagga cagcaaggac agcacctaca gcctcagcag caccctgacg ctgagcaaag cagactacga gaaacacaaa gtctacgcct gcgaagtcac ag ccatgactgatcagcag ctgag gact ccgtgact ctgag ccgact
ChBRCA84D heavy chain (SEQ ID NO: 107):
DVQLVESGGG LVQPGGSRKL SCAASGFTFS SFGMHWVRQA PEKGLEWVAY ISSDSSAIYY ADTVKGRFTI SRDNPKNTLF LQMTSLRSED TAMYYCGRGR ENIYYGSRLD YWGQGTTLTV SSASTKGPSV FPLAPSSKST SGGTAALGCL VKDYFPEPVT VSWNSGALTS GVHTFPAVLQ SSGLYSLSSV VTVPSSSLGT QTYICNVNHK PSNTKVDKRV EPKSCDKTHT CPPCPAPELL GGPSVFLFPP KPKDTLMISR TPEVTCVVVD VSHEDPEVKF NWYVDGVEVH NAKTKPREEQ YNSTYRWSV LTVLHQDWLN GKEYKCKVSN KALPAPIEKT ISKAKGQPRE PQVYTLPPSR DELTKNQVSL TCLVKGFYPS DIAVEWESNG QPENNYKTTP PVLDSDGSFF LYSKLTVDKS RWQQGNVFSC SVMHEALHNH YTQKSLSLSP
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GK
Polynucleotide encoding the heavy chain of chBRCA84D (SEQ ID NO: 108):
gatgtgcagc ccggaaactc tgcactgggt attagtagtg attcaccatc ccagtctaag gaaaacattt tctcacagtc caccctcctc gtcaaggact cctgaccagc tctactccct cagacctaca caagagagtt gcccagcacc aaacccaagg ggtggtggac tggacggcgt tacaacagca ctggctgaat cagcccccat ccacaggtgt ggtcagcctg tggagtggga cccgtgctgg ggacaagagc atgaggctct ggtaaatga tggtggagtc tcctgtgcag tcgtcaggct acagtagtgc tccagagaca gtctgaggac actacggtag tcctcagcct caagagcacc acttccccga ggcgtgcaca cagcagcgtg tctgcaacgt gagcccaaat tgaactcctg acaccctcat gtgagccacg ggaggtgcat cgtaccgtgt ggcaaggagt cgagaaaacc acaccctgcc acctgcctgg gagcaatggg actccgacgg aggtggcagc gcacaaccac tgggggaggc cctctggatt ccagagaagg catctactat atcccaagaa acggccatgt taggcttgac ccaccaaggg tctgggggca accggtgacg ccttcccggc gtgaccgtgc gaatcacaag cttgtgacaa gggggaccgt gatctcccgg aagaccctga aatgccaaga ggtcagcgtc acaagtgcaa atctccaaag cccatcccgg tcaaaggctt cagccggaga ctccttcttc aggggaacgt tacacgcaga ttagtgcagc cactttcagt ggctggagtg gcagacacag caccctgttc attactgtgg tactggggcc cccatcggtc cagcggccct gtgtcgtgga tgtcctacag cctccagcag cccagcaaca aactcacaca cagtcttcct acccctgagg ggtcaagttc caaagccgcg ctcaccgtcc ggtctccaac gatgagctga ccaaagggca acaactacaa ctatcccagc ctctacagca cttctcatgc agagcctctc ctggagggtc agctttggaa ggtcgcatac tgaagggccg ctgcaaatga aagagggagg aaggcaccac ttccccctgg gggctgcctg actcaggcgc tcctcaggac cttgggcacc ccaaggtgga tgcccaccgt cttcccccca tcacatgcgt aactggtacg ggaggagcag tgcaccagga aaagccctcc gccccgagaa ccaagaacca gacatcgccg gaccacgcct agctcaccgt tccgtgatgc cctgtctccg
Relative binding affinities of antibodies containing: (1) hBRCA84D-2VL and hBRCA84D-2VH (two assays), (2) chimeric BRCA84D, (3) antibody containing hBRCA84D-5VL and chimeric BRCA84D-HC, and ( 4) antibody containing hBRCA84D-5VL and hBRCA84D-2VH. The results are shown in Figure 14.
Example 11
Humanized anti-B7-H3 antibodies inhibit tumor growth in xenografts
In order to demonstrate the ability of humanized anti-B7-H3 antibodies to inhibit tumor growth in vivo, the tumor growth of bladder carcinoma cells was studied.
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INSTITUT · MEXICANO • tLAFR niOAP INDUSTRIAL HT-1197 and A498 renal carcinoma cells in a murine xenoinsert. The humanized antibody hBRCA84D-2 (hBRCA84D-2 VL chain / hBRCA84D2 VL chain) was modified to comprise an Fe region having the substitutions L235V, F243L, R292P, Y300L and P396L. The Fe-modified antibody hBRCA84D-2 was administered to the mice (at a dose of
1 pg / kg, 10 pg / kg or 20 pg / kg) 7 days, 14 days, 21 days and 28 days after implantation of cancer cells. The results show that at all doses the administered Fe-modified hBRCA84D-2 antibody could inhibit the tumor growth of HT-1197 urinary bladder carcinoma cells (Figure 15) and of A498 renal carcinoma cells (Figure 16).
Example 12
Dual Affinity Targeting Reagents (DART ™) specific for B7-H3 and the T-cell receptor mediate potent targeting of T-cells
Dual affinity redirection reagents (DART ™) specific for B7-H3 and the T-cell receptor ("TCR") and for the natural killer lymphocyte group 2D receptor (NKG2D) were prepared. Such DART ™ have the ability to target a T cell (by attaching such a T cell to the TCR-binding portion of a TCR-binding DART ™) or targeting an NK cell (by attaching such an NK cell to the NKG2D-binding portion of a NKG2D-binding DART ™) to the location of a cancer cell (attaching such cancer cell to the B7-H3-binding part of the DART ™). The targeted T cell or NK cell can then mediate the killing of the cancer cell in a process referred to herein as "redirected" killing.
Dual affinity redirection reagent (DART ™) specific for B7-H3 and T-cell receptor ("TCR") was constructed having the hBRCA84D-2 anti-B7-H3 variable domains and the anti-TCR variable domains. :
DART ™ TCR VL x hBRCA84D VH-2-E Coil Chain (SEQ ID NO: 109):
EIVLTQSPAT LSLSPGERAT LSCSATSSVS YMHWYQQKPG KAPKRWIYDT
SKLASGVPSR FSGSGSGTEF TLTISSLQPE DFATYYCQQW SSNPLTFGQG TKLEIKGGGS GGGGEVQLVE SGGGLVQPGG SLRLSCAASG FTFSSFGMHW VRQAPGKGLE WVAYISSDSS RDYYADTVKG TVTISRQALESKGLYDNSKGTVYRTISRGLYTVYGLETVYGLYDVALGETVYLSRQLYADTVKG RFTISRVLYGLESAKI GRYTVKGSLVYGLETV
VAALEKEVAA LEKEVAALEK
Polynucleotide encoding the chain of DART ™ TCR VL x hBRCA84D VH-2-E
Coil (SEQ ID NO: 110):
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<img file="MX345232B_D0097.tif" />
gaaattgtgt tgacacagtc tccagccacc ctgtctttgt ctccagggga aagagccacc ctctcctgca gtgccacctc aagtgtaagt tacatgcact ggtatcagca gaaaccaggg aaagccccta agcgctggat ctatgacaca tccaaactgg cttctggggt cccatcaagg ttcagcggca tcagcagcct gcagcctgaa gtggatctgg gacagaattt actctcacaa gattttgcaa cttattactg tcagcagtgg agtagtaacc cgctcacgtt tggccagggg accaagcttg aqatcaaagg aggcggatcc ggcggcggag gcqaqqtqca gctggtcgag tctggcggag gactggtgca gcctggcggc tccctgagac tgtcttgcgc cgcctccggc ttcaccttct ccagcttcgg catgcactgg gtccgccagg ctccaggcaa gggactggaa tgggtggcct acatctcctc cgactcctcc gccatctact acgccgacac cgtgaagggc aggttcacca tctcccggga caacgccaag aactccctgt acctgcagat gaactccctg cgggacgagg acaccgccgt gtactactgc ggcagaggcc gggagaatat ctactacggc tcccggctgg attattgggg ccagggcacc accgtgaccg tqtcctccgg aggatgtggc ggtggagaag tggccgcact ggagaaagag gttgctgctt tggagaagga ggtcgctgca cttgaaaagg aggtcgcagc cctggagaaa
HBRCA84DVL-2 x TCR VH - K coil string (SEQ ID NO: 111):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GKAPKALIYS
ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ
GTKLEIKGGG SGGGGQVQLV QSGAEVKKPG ASVKVSCKAS GYKFTSYVMH WVRQAPGQGL EWIGYINPYN DVTKYNEKFK GRVTITADKS TSTAYLQMNS LRSEDTAVHY CARGSYYDYD GFGVHY CARGSYYDYD GFGVYWGALKEVKVAGALKED GFGVYWGALKEVKVAKSKTV AQGFGLTV KVALKEKVAGSKEVYD
Polynucleotide encoding the chain of hBRCA84DVL-2 x TCR VH - K coil (SEQ
ID NO: 112):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgacc atcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggcaaggccc ctaaggcgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa qggaggcgga tccggcggcg gaggccaqqt tcagctggtg cagtctggag ctgaggtgaa gaagcctggg gcctcagtga aggtctcctg caaggccagc ggttacaagt ttaccagcta cgtgatgcac tgggtgcgac aggcccctgg acaagggctt gagtggatcg gatatattaa tccttacaat agtacaatga gatgttacta ggcagagtca gaagttcaaa cgattaccgc ggacaaatcc acgagcacag cctacctgca gatgaacagc ctgagatccg aggacacggc cgtgcactac tgtgcgagag ggagctacta tgattacgac gggtttgttt actggggcca agggactctg gtcactgtga qctccggagg atgtggcggt ggaaaagtgg ccgcactqaa ggagaaagtt
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INSTITUTO MEXICANO PE LA PROUBDAD INDUSTRIAL qctqctttqa aaqagaaqgt cgccgcactt aaggaaaagg tcgcaqccct gaaagag '
The dual affinity redirection reagent (DART ™) specific for B7-H3 and for the natural killer lymphocyte group 2D receptor (NKG2D) was constructed which had the 5 hBRCA84D-2 anti-B7-H3 variable domains and the hBRCA84D-2 domains anti-TCR variables:
DART ™ NKG2D VL x hBRCA84D VH-2-E Coil Chain (SEQ ID NO: 113):
QSALTQPASV SGSPGQSITI SCSGSSSNIG NNAVNWYQQL PGKAPKLLIY
YDDLLPSGVS DRFSGSKSGT SAFLAISGLQ SEDEADYYCA AWDDSLNGPV
FGGGTKLTVL GGGSGGGGEV QLVESGGGLV QPGGSLRLSC AASGFTFSSF
GMHWVRQAPG KGLEWVAYIS SDSSAIYYAD TVKGRFTISR DNAKNSLYLQ
MNSLRDEDTA VYYCGRGREN IYYGSRLDYW GQGTTVTVSS GGCGGGEVAA LEKEVAALEKE VAALEKEVA ALEK
Polynucleotide encoding the DART ™ NKG2D VL x hBRCA84D VH2-E Coil chain (SEQ ID NO: 114):
cagtctgccc aatcaccatc ttaactggta tatgatgacc gtctggcacc aggctgatta ttcggcggag aggcqaqqtq gctccctgag ggcatgcact ctacatctcc gcaggttcac atgaactccc ccgggagaat ccaccgtgac ctggagaaag SSLaSStcgca tgactcagcc tcctgttctg ccagcagctc tactgccctc tcagccttcc ttactgtgca ggaccaagct cagctggtcg actgtcttgc gggtccgcca tccgactcct catctcccgg tgcgggacga atctactacg cgtgtcctcc aggttgctgc gccctggaga tgcctccgtg gaagcagctc ccaggaaagg aggggtctct tggccatcag gcatgggatg gaccgtccta agtctggcgg gccgcctccg ggctccaggc ccgccatcta gacaacgcca ggacaccgcc gctcccggct ggaggatgtg tttggagaag aa tctgggtctc caacatcgga ctcccaaact gaccgattct tgggctccag acagcctgaa ggaggcggat aggactggtg gcttcacctt aagggactgg ctacgccgac agaactccct gtgtactact ggattattgg gcggtggaga aaggtcactg ctggacagtc aataatgctg cctcatctat ctggctccaa tctgaggatg tggtccagtg ccggcggcgg cagcctggcg ctccagcttc aatgggtggc accgtgaagg gtacctgcag gcggcagagg ggccagggca agtggccgca cacttgaaaa
HBRCA84DVL-2 x NKG2D VH - K coil string (SEQ ID NO: 115):
DIQLTQSPSF LSASVGDRVT ITCKASQNVD TNVAWYQQKP GKAPKALIYS ASYRYSGVPS RFSGSGSGTD FTLTISSLQP EDFATYYCQQ YNNYPFTFGQ
GTKLEIKGGG SGGGGQVQLV ESGGGLVKPG GSLRLSCAAS GFTFSSYGMH
WVRQAPGKGL EWVAFIRYDG SNKYYADSVK GRFTISRDNS KNTLYLQMNS LRAEDTAVYY CAKDRGLGDG TYFDYWGQGT TVTVSSGGCG GGKVAALKEK VAALKEKVAA LKEKVAALKE
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<img file="MX345232B_D0099.tif" />
Polynucleotide encoding the chain of hBRCA84DVL-2 x NKXizÚ Vfj - K coi!
(SEQ ID NO: 116):
gacatccagc tgacccagtc cccctccttc ctgtctgcct ccgtgggcga cagagtgacc atcacatgca aggcctccca gaacgtggac accaacgtgg cctggtatca gcagaagcct ggcaaggccc ctaaggcgct gatctactcc gcctcctacc ggtactccgg cgtgccttcc aggttctccg gctccggctc tggcaccgac ttcaccctga ccatctccag cctgcagcct gaggacttcg ccacctacta ctgccagcag tacaacaact accctttcac cttcggccag ggcaccaagc tggaaatcaa qggaggcgga tccggcggcg qaggccaqqt acagctggtg gagtctgggg gaggcctggt gggtccctga caagcctgga gactctcctg tgcagcgtct ggattcacct tcagtagcta tggcatgcac tgggtccgcc aggctccagg caaggggctg gagtgggtgg catttatacg gtatgatgga agtaataaat actatgcaga ctccgtgaag ggccgattca ccatctccag agacaattcc aagaacacgc tgtatctgca aatgaacagc ctgagagctg aggacacggc tgtgtattac tgtgcgaaag atcgaggttt gggggatgga acctactttg actactgggg ccaagggacc acggtcaccg tctcctccgg aggatgtggc ggtggaaaag tggccgcact gaaggagaaa gttgctgctt tgaaagagaa ggtcgccgca cttaaggaaa aggtcgcagc cctqaaagaq
In order to demonstrate the ability of DART ™ to mediate such redirected killing of cancer cells, the previously described DART ™ hBRCA84D-2 / anti-TCR ("T-DART ™"), hBRCA84D-2, hBRCA84D-2 ( modified with Fe: L235V, F243L, R292P, Y300L, and P396L), and a TCR-DART ™ control at various concentrations with target cancer cells (SK-MES-1 lung cancer cells, A498 renal carcinoma cells, LNCaP prostate cancer cells , or UACC-62 melanoma cells) and effector resting PBMC (E: T ratio = 30: 1) and cytotoxicity was determined (LDH assay). The results of these investigations are shown in Figures 17A-17D and demonstrate the ability of DART ™ hBRCA84D-2 / anti-TCR ("T-DART ™") to mediate targeted killing of cancer cells.
Example 13 Pharmacokinetic Profile in Tumor Free Mice
The anti-B7-H3 antibody (mAb) was injected into male mice mCD16 - / -, hCD16A_FOXNl (5 mg / kg; iv) and serum was assayed (pre-dose and) at 2, 15, 30 min, and 1, 2, 4, 6 h, and 1, 2, 3, 6, 8, 14, 21 and 28 days after injection. The antibody was found to have a T '/ 2 of 10.54 days and a C<sub>max</sub> of 43,493 pg / ml. The antibody concentration over time was found to be biphasic, conforming to a model of two 144
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INSTTTUT · MEXICANO DELAFEOmBAD INBUSTRJAL components (Figures 18A-18B). Predicted pharmacokinetic profiles generated using a 2-compartment model with parameters from the 5 mg / kg dose are shown in Figure 18C.
Example 14
Ability of Anti-B7-H3 Antibody to Bind HT1197 Urinary Bladder Cancer Cells and Prevent or Inhibit Tumor Development in a Murine Xenograft Model
The anti-B7-H3 antibody (mAb) described above was evaluated for its ability to bind HT-1197, a urinary bladder carcinoma cell line that expresses human B7-H3. As shown in Figure 19, such cells show higher expression of PRCA135 than HER2, and therefore are particularly suitable for evaluating the therapeutic potential of the antibodies of the present invention in the treatment of HT-1197 tumors. Based on this conclusion, it was found that the hBRCA84D anti-B7-H3 antibody variants could bind to HT-1197 cells. Figure 20 shows the binding affinity of mAb antibodies to HT-1197 cells.
They were implanted subcutaneously in mice (mCDló - / -, hCD16A + _FoxNl) on their sides 8 x 10<sup>6</sup> HT-1197 cells. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x5 implantation using doses of 0.1, 0.5, 1, 5, or 10 mg / kg (eight female mice per dose). Cetuximab (anti-EGRF antibody) was administered to a control group of mice at doses of 1, 5, or 15 mg / kg (eight female mice per dose). Eight female mice were also injected with vehicle or control IgG 10 mg / kg. Tumor measurements were made every 3-4 days. The results of the experiment (Figure 21A) show that mAb could prevent or inhibit urinary bladder tumor development in the murine xenograft model. Figure 2IB shows the results obtained using centimab. A comparison of Figures 21A and 21B demonstrates that the antibodies of the present invention are more effective than centimab in preventing or inhibiting urinary bladder tumor development in the murine xenograft model. Figure 21C compares the results obtained at the maximum doses tested.
Example 15
Ability of Anti-B7-H3 Antibody to Bind HT1376 Urinary Bladder Cancer Cells and Prevent or Inhibit Tumor Development in a Murine Xenograft Model
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MEXICAN INSTITUTE
OF THE WINDUSTRIAL NORTH
The anti-B7-H3 antibody (mAb) described above was evaluated for dülUUliiliai its<sup>1</sup> * ability to bind HT-1376, a urinary bladder carcinoma cell line that expresses human B7-H3. As shown in Figures 22A-22B, such cells show a higher expression of PRCA 135 than HER2 or PMSA, and therefore are particularly suitable for evaluating the therapeutic potential of the antibodies of the present invention in the treatment of HT- tumors. 1376. Based on this conclusion, it was found that anti-B7-H3 hBRCA84D antibody variants could bind to HT-1197 cells. Figures 22A-22B show the binding affinity of mAb antibodies to HT-1197 cells.
They were implanted subcutaneously in mice (mCD16 - / -, hCD16A + _FoxNl) on their sides 5 x 10<sup>6</sup> HT-1376 cells. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x4 implantation at a dose of 1 mg / kg. The results of the experiment (Figure 23) show that mAb could prevent or inhibit urinary bladder tumor development in the murine xenograft model.
Example 16
Ability of anti-B7-H3 antibody to bind to cancer cells
Anti-B7-H3 BRCA84D antibody was evaluated by FACS analysis for its ability to bind to: SW480 and SW620 colorectal cancer cells; AGS gastric cancer cells; melanoma cells M-14 and LOX LVMI; 22rv prostate cancer cells; pancreatic cancer cells AsPC-1 and BxPc-3; kidney cancer cells A498 and 786-0. The antibody was found to be able to bind to all such cells.
Example 17
Ability of anti-B7-H3 antibody to prevent or inhibit gastric tumor development in a murine xenograft model
They were implanted subcutaneously in mice (mCD16 - / -, hCD16A + _FoxNl) on their sides 5 x 10<sup>6</sup> AGS cells. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x5 implantation using doses of 0.5, 1, 5, or 10 mg / kg. The results of the experiment (Figure 24) show that mAb could prevent or inhibit gastric tumor development in the murine xenograft model.
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OF INDUSTRIAL PROPERTY
Example 18 - ..
Ability of anti-B7-H3 antibody to bind to lung cancer cells and to prevent or inhibit tumor development in a murine xenograft model
A549 lung cancer cells were incubated in the presence of hBRCA84D, chBRCA84D and hBRCA84 (0264 Fe) variants and the cytotoxic effect of these antibodies was determined. The results of this experiment are shown in Figure 25, and indicate that all three of the antibodies were cytotoxic against A549 cells.
They were implanted subcutaneously in mice (mCD16 - / -, hCD16A + _FoxNl) on their sides 8 x 10<sup>6</sup> A549 cells. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x4 implantation using a dose of 1 mg / kg. The results of the experiment (Figure 26) show that mAb could prevent or inhibit lung cancer tumor development in the murine xenograft model.
FACS analysis was performed with CaLu3 lung cancer cells in order to determine whether such cells bind to anti-B7-H3 antibodies. The experiment confirmed that such cells express B7-H3 and bind to the antibodies of the present invention. To determine whether the antibodies of the present invention were effective in preventing or inhibiting the tumor development of lung cancer, they were implanted subcutaneously in mice (mCD16 - / -, hCD16A + _FoxNl) on their flanks 5 x 10<sup>6</sup> CaLu3 cells. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x4 implantation using a dose of 0.5, 1 or 5 mg / kg. The results of the experiment (Figure 27) show that mAb could prevent or inhibit lung cancer tumor development in the murine xenograft model.
Example 19
Ability of anti-B7-H3 antibody to prevent or inhibit LOX melanoma tumor development in a murine xenograft model
LOX melanoma cancer cells were implanted subcutaneously in mice (eight mCD16 - / - females, hCD16A + _FoxNl) on their flanks and then inoculated iv / Q7D x3 PBS control, IgG control (5 / mg / kg), MAb (0.5,1, 5 or 10 mg / kg), or ip / BIWx2 with doxetaxel (5, 10 or 20 mg / kg). Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with AcMl was started within 7 days
147
<img file="MX345232B_D0102.tif" />
IMPI
INSTITUTO MEXICANO OE LA PROWSDAD «HOUCTUAL since the implantation. The results of the experiment (Figures 28A728C) showed that AcMl—— could prevent or inhibit the tumor development of melanoma cancer in the murine xenograft model.
Example 20
Ability of anti-B7-H3 antibody to prevent or inhibit UACC-62 melanoma tumor development in a murine xenograft model
UACC-62 melanoma cancer cells (5 / mg / kg ) or mAb (0.5, 1, 5 or 10 mg / kg). Immoral cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with AcMl was started within 7 days of implantation. The results of the experiment (Figure 29) show that mAb could prevent or inhibit melanoma cancer tumor development in the murine xenograft model.
Example 21
Ability of Anti-B7-H3 Antibody to Prevent or Inhibit Prostate Tumor Development in a Murine Xenograft Model
They were implanted subcutaneously in mice (mCD16 - / -, hCD16A + _FoxNl) on their sides 6 x 10<sup>6</sup> 22rv prostate cancer cells and then inoculated iv / Q7D x4 PBS control, IgG (10 mg / kg), mAb (0.5, 1, 5 or 10 mg / kg; Q7D x5) or trastuzumab (1, 7 or 15 mg / kg). Immoral cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with AcMl was started within 7 days of implantation. The results of the experiment (Figure 30A-30C) show that mAb could prevent or inhibit tumor development of prostate cancer in the murine xenograft model.
Example 22
Ability of anti-B7-H3 antibody to bind to kidney cancer cells and prevent or inhibit tumor development in a murine xenograft model
A498 kidney cancer cells were incubated in the presence of hBRCA84D, chBRCA84D and hBRCA84 (0264 Fe) variants and the cytotoxic effect of these antibodies was determined. The results of this experiment are shown in Figure 31, and indicate that all three of the antibodies were cytotoxic against A498 cells.
148
<img file="MX345232B_D0103.tif" />
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INSTITUTO MEXICANO DB LA PROliWAD INDUSTMIAL
A498 kidney cancer cells were incubated in the presence of VSHáñtéS TiBRUA ^ ÍD, chBRCA84D and hBRCA84 (0264 Fe) and the cytotoxic effect of these antibodies was determined. The results of this experiment are shown in Figure 31, and indicate that all three of the antibodies were cytotoxic against A498 cells.
IHC analysis of A498 xenograft tumor tissue was performed using biotinylated BRCA84D antibody (20 pg / ml), BRCA69D (5 pg / ml) and anti-Her2 antibody (20 pg / ml). BRCA84D was found to bind 20-40% of tumor tissue (weak to moderate: + or ++); BRCA69D antibody was found to bind 80-100% of tumor tissue (moderately to strongly: ++ or +++). The BRCA84D antibody was found to bind weakly to 40% UMUC-3 (+) tumor tissue; BRCA69D was found to bind moderately or strongly to 70% of such tumor tissue (++ or +++); Anti-Her2 antibody was found to variably bind 20% of such tumor tissue (+ - +++). As controls, the anti-Her2 antibody was found to bind to SKBR-3 (+++) cells and BRCA84D and BRCA69D were found to be able to bind to Hs 700T (+++) cells.
They were implanted subcutaneously in mice (mCDló - / -, hCD16A + _FoxNl) on their sides 5 x 10<sup>6</sup> kidney cancer cells A498. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x5 implantation using doses of 0.1, 0.5, 1, 5, or 10 mg / kg. Cetuximab (anti-EGRF antibody) was administered to a control group of mice at doses of 1, 7 or 15 mg / kg. Additional control mice were injected with vehicle or control IgG 10 mg / kg. The results of the experiment (Figure 32) show that mAb could prevent or inhibit the tumor development of kidney cancer in the murine xenograft model.
Alternatively, they were implanted subcutaneously in mice (mCDló - / -, hCD16A + _FoxNl) on their sides 5 x 10<sup>6</sup> kidney cancer cells 786-0. Tumor cells were implanted in 200 µΐ of Ham's F12 medium diluted 1: 1 with MATRIGEL ™. Treatment with mAb was started within 7 days of IV Q7D x5 implantation using doses of 0.1, 0.5, 1, 5, or 10 mg / kg. Cetuximab (anti-EGRF antibody) was administered to a control group of mice at doses of 1, 7 or 15 mg / kg. Additional control mice were injected with vehicle or control IgG 10 mg / kg. The results of the experiment (Figures 33A-33B) show that mAb could prevent or inhibit tumor development of kidney cancer in the murine xenograft model.
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<img file="MX345232B_D0104.tif" />
The activity of mAb was compared with that of paclitaxel, a iiiliitJidui iiiilúlfcu uatnlu in cancer chemotherapy. Groups of eight female mice (mCDló - / -, hCD16A + _FoxNl) were implanted subcutaneously in their flanks with 786-0 renal cancer cells and then given IV mAb Q7D at doses of 0.1, 0, 5, 1, 5 or 10 mg / kg. Paclitaxel was administered to a control group of eight such mice at a dose of 2.5 mg / kg on study day 21, 28 and 35. Additional control mice (seven females per group) were injected with 5 mg / kg IgG vehicle or control. The results of the experiment (Figure 34) show that mAb could prevent or inhibit the tumor development of kidney cancer in the murine xenograft model.
Example 23
Toxicology study with cynomolgous monkeys
A toxicology study was performed with cynomolgous monkeys in order to evaluate the acute toxicology profile after a single dose of mAb, determine the pharmacokinetic profile for mAb, establish a time versus dose relationship for the induction of cytokines associated with the activation of effector cells, and evaluate the effect of drug treatment on the level of circulating leukocytes (eg, NK and T cells).
Such a study can be designed to involve four groups of 6 monkeys (3 males and 3 females) and to extend 7 weeks from initial treatment to final autopsy. Group 1 will comprise a control group that will only receive vehicle during weeks 1 and 2. Four members of group 1 (two males and two females) will be euthanized in week 3. The remaining members of group 1 will receive additional vehicle in week 3 and they will be sacrificed for autopsy in week 7. Groups 2-4 are experimental groups that will receive vehicle at week 1, and B7-H3 antibody (1, 30, or 100 mg / kg, respectively) at week 2. Four members of each group (two males and two females) will be euthanized in week 3. The remaining members of each group will receive additional vehicle in week 3 and will be euthanized for autopsy in week 7.
All infusions were well tolerated and no significant changes in body weight, clinical signs, or serum chemistry were observed. Dose-dependent reductions are seen in circulating NK cells but not in circulating B and T cells.
The study provides verification that the cynomolgus monkey is a relevant toxicological species. When contacted with normal human tissue, the BRCA84D antibody exhibited varying degrees of intensity of staining in the liver, pancreas, colon, lung, and adrenal cortex. 150
<img file="MX345232B_D0105.tif" />
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INSTTTUTO MEXICANO M LA INDUSTRIAL CURRENCY
The staining in the liver was relatively limited to "sinusoid lining cells" (fibroblasts and kupffer cells). Staining was observed in the pancreas in mainly collagen fiber and a small percentage of the epithelium (acinar cells and / or intercalated duct cells). Staining in the colon was relatively limited in the apical membrane of crypt epithelium and fibroblast in mucosa. The lung showed a very weak and irregular staining in the epithelium. BRCA84D showed good cross-reactivity in cynomolgus monkey tissues compared to the human tissue profile with the exception of lack of staining in liver and pancreas, and possible expression of B7-H3 in pituitary cells of cynomolgus monkey.
All publications and patents mentioned in this specification are incorporated herein by reference to the same extent as if it were specifically and individually indicated that each individual publication or patent is incorporated by reference in its entirety. Although the invention has been described in relation to specific embodiments thereof, it will be understood that it may be further modified and this application is intended to cover any variation, use, or adaptation of the invention, generally following the principles of the invention and including departures from the present description such that they fall within the known or usual practice of the art to which the invention belongs and as it may be applied to the essential characteristics set forth hereinbefore.
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- Application
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Titles2
- Spanish
- ANTICUERPOS REACTIVOS CON B7-H3, FRAGMENTOS INMUNOLOGICAMENTE
- English
- B7-H3 REACTIVE ANTIBODIES, IMMUNOLOGICALLY FRAGMENTS
Classification
- CPC, 27
- C07K16/2827
- C07K16/30
- A61K2039/505
- C07K2317/33
- C07K2317/24
- C07K2317/92
- C07K2317/76
- C07K2317/77
- A61P35/00
- A61P35/02
- A61P43/00
- A61K39/395
- A61K39/39558
- C07K16/2803
- C07K16/2896
- C07K16/3076
- C07K16/3092
- C07K16/44
- C07K16/468
- G01N33/6893
- A61K45/06
- C07K2317/14
- C07K2317/31
- C07K2317/565
- C07K2317/72
- C07K2317/52
- C07K2317/56
- IPC, 7
- C07K16 30
- A61K39 00
- A61K39 395
- A61K45 06
- C07K16 28
- C07K16 44
- G01N33 68