1. Circulating cell-free AR and CYP17A1 copy number variations may associate with outcome of metastatic castration-resistant prostate cancer patients treated with abiraterone.
- Author
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Salvi, S, Casadio, V, Conteduca, V, Burgio, S L, Menna, C, Bianchi, E, Rossi, L, Carretta, E, Masini, C, Amadori, D, Calistri, D, Attard, G, and De Giorgi, U
- Subjects
NUCLEIC acid isolation methods ,PROSTATE cancer & genetics ,DNA copy number variations ,ABIRATERONE acetate ,PROSTATE cancer treatment ,ANDROGEN receptors ,MULTIVARIATE analysis ,THERAPEUTICS - Abstract
Background:This study aimed to investigate copy number variations (CNVs) of CYP17A1 and androgen receptor (AR) genes in serum cell-free DNA collected before starting abiraterone in 53 consecutive patients with castration-resistant prostate cancer (CRPC).Methods:Serum DNA was isolated and CNVs were analysed for AR and CYP17A1 genes using Taqman copy number assays. The association between CNVs and progression-free/overall survival (PFS/OS) was evaluated by the Kaplan-Meier method and log-rank test.Results:Median PFS of patients with AR gene gain was 2.8 vs 9.5 months of non-gained cases (P<0.0001). Patients with CYP17A1 gene gain had a median PFS of 2.8 months vs 9.2 months in the non-gained patients (P=0.0014). A lower OS was reported in both cases (AR: P<0.0001; CYP17A1: P=0.0085). Multivariate analysis revealed that PSA decline ⩾50%, AR and CYP17A1 CNVs were associated with shorter PFS (P<0.0001, P=0.0004 and P=0.0450, respectively), while performance status, PSA decline ⩾50%, AR CNV and DNA concentration were associated with OS (P=0.0021, P=0.0014, P=0.0026 and P=0.0129, respectively).Conclusions:CNVs of AR and CYP17A1 genes would appear to be associated with outcome of CRPC patients treated with abiraterone. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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