Utility of incorporating genetic variants for the early detection of prostate cancer

Robert K. Nam, William W. Zhang, John Trachtenberg, Arun Seth, Laurence H. Klotz, Aleksandra Stanimirovic, Sanoj Punnen, Vasundara Venkateswaran, Ants Toi, D. Andrew Loblaw, Linda Sugar, Katherine A. Siminovitch, Steven A. Narod

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Purpose: Several single nucleotide polymorphisms (SNP) have been associated with the risk of prostate cancer. The clinical utility of using SNPs in the early detection of prostate cancer has not been evaluated. Experimental Design: We examined a panel of 25 SNPs from candidate genes and chromosomal regions in 3,004 unselected men who were screened for prostate cancer using serum prostate-specific antigen (PSA) and digital rectal examination. All underwent a prostate biopsy. We evaluated the ability of these SNPs to help predict the presence of prostate cancer at biopsy. Results: Of the 3,004 patients, 1,389 (46.2%) were found to have prostate cancer. Fifteen of the 25 SNPs studied were significantly associated with prostate cancer (P = 0.02-7 x 10-8). We selected a combination of 4 SNPs with the best predictive value for further study. After adjusting for other predictive factors, the odds ratio for patients with all four of the variant genotypes com pared with men with no variant genotype was 5.1 (95% confidence interval, 1.6-16.5; P = 0.006).When incorporated into a nomogram, genotype status contributed more significantly than PSA, family history, ethnicity, urinary symptoms, and digital rectal examination (area under the curve = 0.74). The positive predictive value of the PSA test ranged from 42% to 94% depending on the number of variant genotypes carried (P = 1 x 10 -15). Conclusions: SNP genotyping can be used in a clinical setting for the early detection of prostate cancer in a nomogram approach and by improving the positive predictive value of the PSA test.

Original languageEnglish (US)
Pages (from-to)1787-1793
Number of pages7
JournalClinical Cancer Research
Issue number5
StatePublished - Mar 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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