Phase II study of satraplatin and prednisone in patients with metastatic castration-resistant prostate cancer: A pharmacogenetic assessment of outcome and toxicity

William D. Figg*, Cindy H. Chau, Ravi A. Madan, James L. Gulley, Rui Gao, Tristan M. Sissung, Shawn Spencer, Melony Beatson, Jeanny Aragon-Ching, Seth M. Steinberg, William L. Dahut

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Background: We assessed the effect of excision repair cross-complementing group 1 (ERCC1) and x-ray cross-complementing group 1 (XRCC1) gene polymorphisms on treatment outcomes with satraplatin and prednisone in patients with metastatic castration-resistant prostate cancer previously treated with docetaxel-based therapy. Patients and Methods: Twenty-four patients were enrolled in this single arm study. The primary objective was to determine if the presence of ERCC1 Asn118Asn (N118N, 500C>T, rs11615) and XRCC1 Arg399Gln (R399Q, 1301G>A, rs25487) genetic variants might be associated with an impact on progression-free survival (PFS); secondary objectives included overall response, survival, and toxicity. Results: After population stratification by race, white patients carrying heterozygous or variant genotypes at the ERCC1 C>T locus had a >3-fold longer median PFS (5.8 vs. 1.8 months; 2P =.18, adjusted) and 5-fold longer median overall survival (OS) (15.7 vs. 3.2 months; 2P =.010, adjusted) than did patients carrying only wild-type alleles. For the XRCC1 G>A variant, without regard to race, patients carrying the wild-type GG alleles had a longer PFS (9.3 months) than those carrying GA or AA alleles (2.7 months; 2P =.02). Similarly, those carrying GG alleles did not reach median OS, whereas those carrying GA or AA alleles had a median OS of 9.6 months (2P =.12, adjusted). Multivariable analysis by using Cox proportional hazards modeling demonstrated that only XRCC1 was associated with PFS. Conclusions: To our knowledge, this is the first prospective study to date in patients with metastatic castration-resistant prostate cancer that describes predictive germline polymorphisms of ERCC1 and XRCC1 for assessing the clinical activity of satraplatin.

Original languageEnglish
Pages (from-to)229-237
Number of pages9
JournalClinical Genitourinary Cancer
Volume11
Issue number3
DOIs
StatePublished - Sep 2013
Externally publishedYes

Keywords

  • ERCC1
  • Genotyping
  • Prostate cancer
  • Satraplatin
  • XRCC1

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