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Int. J. Mol. Sci. 2016, 17(7), 1097; doi:10.3390/ijms17071097

Common Genetic Variation in CYP17A1 and Response to Abiraterone Acetate in Patients with Metastatic Castration-Resistant Prostate Cancer

1
Department of Internal Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
2
Department of Oncology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
3
Division of Biomedical Statistics and Informatics, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
4
Mayo High School, 1420 11th Avenue SE, Rochester, MN 55904, USA
5
Experimental and Clinical Pharmacology Department, University of Minnesota, 515 Delaware St. SE, Minneapolis, MN 55455, USA
*
Author to whom correspondence should be addressed.
Academic Editor: William Chi-shing Cho
Received: 10 June 2016 / Revised: 24 June 2016 / Accepted: 5 July 2016 / Published: 9 July 2016
(This article belongs to the Special Issue Precision Medicine—From Bench to Bedside)
View Full-Text   |   Download PDF [381 KB, uploaded 9 July 2016]   |  

Abstract

Treatment with abiraterone acetate and prednisone (AA/P) prolongs survival in metastatic castration-resistant prostate cancer (mCRPC) patients. We evaluated the genetic variation in CYP17A1 as predictive of response to AA/P. A prospective collection of germline DNA prior to AA/P initiation and follow-up of a mCRPC cohort was performed. Five common single-nucleotide polymorphisms (SNPs) in CYP17A1 identified using a haplotype-based tagging algorithm were genotyped. Clinical outcomes included biochemical response and time to biochemical progression on AA/P. Logistic regression was used to assess the association between tag SNPs and biochemical response. Proportional hazards regression was used to assess the association between tag SNPs and time to biochemical progression. Odds or hazard ratio per minor allele were estimated and p-values below 0.05 were considered statistically significant. Germline DNA was successfully genotyped for four tag SNPs in 87 patients. The median age was 73 years (54–90); the median prostate-specific antigen was 66 ng/dL (0.1–99.9). A single SNP, rs2486758, was associated with lower odds of experiencing a biochemical response (Odds ratio 0.22, 95% confidence interval 0.07–0.63, p = 0.005) and a shorter time to biochemical progression (Hazard ratio 2.23, 95% confidence interval 1.39–3.56, p < 0.001). This tag SNP located in the promoter region of CYP17A1 will need further validation as a predictive biomarker for AA/P therapy. View Full-Text
Keywords: metastatic castration-resistant prostate cancer; abiraterone acetate; single nucleotide polymorphism; CYP17A1; predictive biomarker metastatic castration-resistant prostate cancer; abiraterone acetate; single nucleotide polymorphism; CYP17A1; predictive biomarker
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MDPI and ACS Style

Binder, M.; Zhang, B.Y.; Hillman, D.W.; Kohli, R.; Kohli, T.; Lee, A.; Kohli, M. Common Genetic Variation in CYP17A1 and Response to Abiraterone Acetate in Patients with Metastatic Castration-Resistant Prostate Cancer. Int. J. Mol. Sci. 2016, 17, 1097.

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