Genes involved in estrogen metabolism
View Patent ↗The invention concerns genes that have been identified as being involved in estrogen metabolism, and are useful as diagnostic, prognostic and/or predictive markers in cancer. In particular, the invention concerns genes the tumor expression levels of which are useful in the diagnosis of cancers associated with estrogen metabolism, and/or in the prognosis of clinical outcome and/or prediction of drug response of such cancers.
1. A method of predicting the likelihood of distant recurrence-free survival for a human subject diagnosed with breast cancer, comprising:
assaying a level of an RNA transcript of N-acetyltransferase 1 (NAT1) in a tumor sample obtained from said subject using a primer comprising a nucleotide sequence selected from SEQ ID NO:226 and SEQ ID NO:227;
normalizing the RNA level of NAT1 against the level of one or more reference genes to obtain a normalized expression level of NAT1;
using the normalized expression level of NAT1 to generate information comprising a prediction of the likelihood of distant recurrence-free survival for said subject,
wherein the normalized expression level of NAT1 is positively correlated with a longer distant recurrence-free survival, and wherein distant recurrence-free survival is the time from surgery until the first diagnosis of distant recurrence.
2. The method of claim 1 , wherein said normalized expression level is obtained by a method of gene expression profiling.
3. The method of claim 1 , wherein said level of an RNA transcript of NAT1 is assayed by a polymerase chain reaction-based method.
4. The method of claim 1 , wherein the tumor sample is obtained by biopsy.
5. The method of claim 4 , wherein the biopsy is a fine needle biopsy.
6. The method of claim 1 , wherein the tumor sample comprises fragmented RNA.
7. The method of claim 1 , further comprising generating a report based on the information.
8. The method of claim 7 , wherein the report comprises information concerning a risk of cancer recurrence for said subject.
9. The method of claim 7 , wherein the report further comprises information to guide a cancer treatment decision for said subject.
10. The method of claim 1 , further comprising assaying a level of at least one additional RNA transcript, or an expression product thereof, selected from the group GSTM1, GSTM2, GSTM3, GSTM4, GSTM5, TFRC, MVP, PRAME, PPIH, VDAC1, and CYP4Z1.
11. The method of claim 1 , wherein the tumor sample is a paraffin-embedded and fixed tissue sample.
12. The method of claim 1 , wherein the tumor sample is frozen.
13. The method of claim 1 , wherein the breast cancer is invasive breast cancer.
14. A method for determining the likelihood of distant recurrence-free survival from a fixed, wax-embedded tissue sample obtained from a human breast cancer patient, comprising:
extracting RNA from the fixed, wax-embedded tissue sample;
amplifying an RNA transcript of N-acetyltransferase 1 (NAT1) using a primer comprising a nucleotide sequence selected from SEQ ID NO:226 and SEQ ID NO:227;
producing an amplicon of the RNA transcript of NAT1;
assaying a level of the amplicon of the RNA transcript of NAT1;
normalizing the level of the amplicon of the RNA transcript of NAT1, against the level of an amplicon of one or more reference genes to obtain a normalized NAT1 amplicon level;
comparing the normalized NAT1 amplicon level to a normalized NAT1 amplicon level obtained from a breast cancer reference set; and
determining that the patient has an increased likelihood of longer distant recurrence-free survival if the normalized NAT1 amplicon level is increased and that the patient has a decreased likelihood of longer distant recurrence-free survival if the normalized NAT1 amplicon level is decreased, wherein distant recurrence-free survival is the time from surgery until the first diagnosis of distant recurrence.
15. The method of claim 14 , wherein the RNA transcript of NAT1 is amplified by a polymerase chain reaction-based method.
16. The method of claim 14 , wherein the level of the amplicon of the RNA transcript of NAT1 is a threshold cycle (C t ) value and the normalized NAT1 amplicon level is a normalized C t value.
17. The method of claim 14 , further comprising amplifying an RNA transcript of at least one additional RNA transcript selected from the group GSTM1, GSTM2, GSTM3, GSTM4, GSTM5, TFRC, MVP, PRAMS, PPIH, VDAC1, and CYP4Z1.
18. The method of claim 14 , further comprising generating a report based on the increased or decreased likelihood of distant recurrence-free survival of the patient.
19. The method of claim 14 , wherein the breast cancer is invasive breast cancer.