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SRD5A polymorphisms and biochemical failure after radical prostatectomy.

Etienne Audet-Walsh1, Judith Bellemare, Geneviève Nadeau

  • 1Pharmacogenomics Laboratory, Centre Hospitalier Universitaire de Québec (CHUQ) Research Centre and Faculty of Pharmacy, Laval University, Québec, Canada.

European Urology
|July 1, 2011
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Summary

Germ-line variations in steroid-5α-reductase genes (SRD5A1 and SRD5A2) are linked to biochemical recurrence (BCR) after prostate cancer surgery. Specific single nucleotide polymorphisms (SNPs) act as independent predictors of BCR risk in diverse patient groups.

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Area of Science:

  • Genetics and Urology
  • Molecular Biology and Oncology

Background:

  • The prognostic role of germ-line variations in 5α-reductase pathways, crucial for androgen biosynthesis, in predicting biochemical recurrence (BCR) after radical prostatectomy (RP) is largely unknown.
  • Investigating these genetic factors may offer new insights into prostate cancer recurrence risk.

Purpose of the Study:

  • To investigate the association between germ-line variations in the steroid-5α-reductase, α-polypeptide 1 (SRD5A1) and steroid-5α-reductase, α-polypeptide 2 (SRD5A2) genes and the risk of BCR after RP.
  • To identify specific genetic markers that predict treatment outcomes in prostate cancer patients.

Main Methods:

  • Retrospective analysis of two independent cohorts (526 white and 320 Asian men) with organ-confined prostate cancer undergoing RP.
  • Genotyping of 19 haplotype-tagging single nucleotide polymorphisms (htSNPs) in SRD5A1 and SRD5A2 genes.
  • Prognostic significance assessed using Kaplan-Meier analysis and Cox regression, adjusting for clinicopathologic factors.

Main Results:

  • Four single nucleotide polymorphisms (SNPs) in SRD5A1 and SRD5A2 were significantly associated with BCR in both white and Asian cohorts.
  • The SRD5A2 V89L SNP (rs523349C) showed the strongest association with increased BCR risk (HR: 2.87).
  • A combination of SRD5A1 (rs518673T) and SRD5A2 (rs12470143A) SNPs was associated with reduced BCR in white patients, while SRD5A2 rs12470143A was significant in Asians.

Conclusions:

  • This study provides the first evidence that variations in SRD5A1 and SRD5A2 genes are independent predictors of BCR after radical prostatectomy.
  • Identified SNPs may serve as valuable biomarkers for predicting recurrence risk in prostate cancer patients.
  • Further research is warranted to explore the functional mechanisms and clinical utility of these genetic markers.