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- W1981857241 abstract "Abstract Inhibitors of 5α-reductase (SRD5A) that lower intraprostatic levels of dihydrotestosterone (DHT) reduce the overall incidence of prostate cancer (PCa), but there is significant variation in chemopreventive activity between individual men. In seeking molecular alterations that might underlie this variation, we compared gene expression patterns in patients with localized PCa who were randomized to prostatectomy alone versus treatment with two different doses of the SRD5A inhibitor dutasteride. Prostatic levels of DHT were decreased by >90% in both dutasteride-treated patient groups versus the untreated patient group. Despite significant and uniform suppression of tissue DHT, unsupervised clustering based on prostatic gene expression did not discriminate these groups. However, subjects could be resolved into distinct cohorts characterized by high or low expression of genes regulated by the androgen receptor (AR), based solely on AR transcript expression. The higher-dose dutasteride treatment group was found to include significantly fewer cancers with TMPRSS2-ERG genetic fusions. Dutasteride treatment was associated with highly variable alterations in benign epithelial gene expression. Segregating subjects based on expression of AR and androgen-regulated genes revealed that patients are differentially sensitive to SRD5A inhibition. Our findings suggest that AR levels may predict the chemopreventive efficacy of SRD5A inhibitors. Cancer Res; 70(4); 1286–95" @default.
- W1981857241 created "2016-06-24" @default.
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- W1981857241 date "2010-02-14" @default.
- W1981857241 modified "2023-09-30" @default.
- W1981857241 title "Variability in the Androgen Response of Prostate Epithelium to 5α-Reductase Inhibition: Implications for Prostate Cancer Chemoprevention" @default.
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- W1981857241 doi "https://doi.org/10.1158/0008-5472.can-09-2509" @default.
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