CA2829477A1

Gene expression markers for breast cancer prognosis

Abstract

The present invention provides gene sets the expression of which is important in the diagnosis and/or prognosis of breast cancer.

CA2829477A1, drawing sheet 1
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Projected expiry passed 14 January 2024, 2.7 years ago.

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4 claims: 4 independent, 0 dependent

  1. 1
    We claim:1. A method of predicting the likelihood of long-term survival of a breast cancer patient without the recurrence of breast cancer, comprising determining a level of an RNA transcript of CD68, or an expression product thereof, in a breast cancer tissue sample from said patient, normalizing said level against the expression level of all RNA transcripts or their products in said breast cancer tissue sample, or of a reference set of RNA transcripts or their expression products, to obtain a normalized CD68 expression level;comparing the normalized CD68 expression level to a normalized CD68 expression level in reference breast tumor samples;and predicting a likelihood of long-term survival without recurrence of breast cancer of the patient, wherein increased normalized CD68 expression level CD68 indicates a decreased likelihood of long-term survival without breast cancer recurrence. 2. The method of claim 1, wherein the breast cancer is invasive breast carcinoma. 3. The method of claim 1 or 2, wherein said RNA is isolated from a fixed, waxembedded breast cancer tissue specimen of said patient. 4. The method of claim 1 or 2, wherein said RNA is isolated from core biopsy tissue or fine needle aspirate cells. 5. The method of any one of claims 1 to 4, wherein the level of the RNA transcript of CD68 is determined by quantitative reverse transcription polymerase chain reaction (qRT-PCR). 6. The method of any one of claims 1 to 4, wherein said expression product is quantified by immunohistochemistry or by proteomics technology. 7. The method of any one of claims 1 to 6, further comprising the step of preparing a report indicating that the patient has an increased or decreased likelihood of long-term survival without breast cancer recurrence. 8. A method of predicting the likelihood of long-term survival of a patient diagnosed with estrogen receptor (ER)-positive breast cancer, without the recurrence of breast cancer, comprising the steps of: (1) determining the level of an RNA transcript of CD68, or an expression product 125 CA 02829477 2013-10-03 thereof, in a breast cancer tissue sample from said patient;
  2. 2
    (2) normalizing the level of the RNA transcript of CD68, or the expression product thereof, against a reference set of RNA transcripts, or the expression products thereof, to obtain a normalized CD68 expression level;
  3. 3
    (3) comparing the normalized CD68 expression level to a normalized CD68 expression level in reference breast tumor samples;
  4. 4
    (4) subjecting the normalized CD68 expression level obtained in step (2) to statistical analysis;and (5) determining whether the patient has an increased or decreased likelihood of said longterm survival without recurrence of breast cancer, wherein increased normalized CD68 expression level is indicative of a reduced likelihood of long-term survival without recurrence of breast cancer. 9. The method of claim 8, wherein said sample is fixed, paraffin-embedded, fresh, or frozen. 10. The method of claim 8, wherein said sample is a biopsy sample. 11. The method of claim 8, wherein said sample is a tissue sample from a fine needle or a core biopsy. 12. The method of any one of claims 8 to 11, wherein the level of the RNA transcript of CD68 is determined by quantitative reverse transcription polymerase chain reaction (qRT-PCR). 13. The method of any one of claims 8 to 11, wherein said expression product is quantified by immunohistochemistry or by proteomics technology. 14. The method of any one of claims 8 to 13, further comprising the step of preparing a report indicating that the patient has an increased or decreased likelihood of long-term survival without breast cancer recurrence. 15. A method of predicting the likelihood of long-term survival of a breast cancer patient without the recurrence of breast cancer, comprising;isolating RNA from a fixed, paraffin-embedded tissue sample of a breast tumor of the patient;reverse transcribing an RNA transcript of CD68 to produce a cDNA of CD68;126 CA 02829477 2013-10-03 amplifying the cDNA of CD68;producing an amplicon of the RNA transcript of CD68;assaying a level of the amplicon of the RNA transcript of CD68;normalizing said level against a level of an amplicon of at least one reference RNA transcript in said tissue sample to provide a normalized CD68 amplicon level;comparing the normalized CD68 amplicon level to a normalized CD68 amplicon level in reference breast tumor samples;and predicting the likelihood of long-term survival without the recurrence of breast cancer, wherein increased normalized CD68 amplicon level is indicative of a reduced likelihood of long-term survival without recurrence of breast cancer. 16. The method of claim 15, wherein the breast cancer is invasive breast cancer. 17. The method of claim 15 or 16, wherein the breast cancer is estrogen receptor (ER) positive breast cancer. 18. The method of claim 15, 16 or 17, wherein the cDNA of CD68 is amplified by polymerase chain reaction. 19. The method of any one of claims 15 to 18, wherein the level of the amplicon of the RNA transcript of CD68 is a threshold cycle (Ct) value and the normalized CD68 amplicon level is a normalized Ct value. 20. The method of any one of claims 15 to 19, further comprising the step of preparing a report indicating that the patient has an increased or decreased likelihood of long-term survival without breast cancer recurrence. 21. The method of any one of claims 15 to 20, wherein the reference breast cancer samples comprise at least 40 breast cancer samples. 22. The method of any one of claims 1 to 21, further comprising determining a normalized level of expression of an RNA transcript of MYBL2 or the transcript’s expression product, wherein increased normalized expression of MYBL2 further indicates a decreased likelihood of long-term survival without breast cancer recurrence. 127