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Efficacy of Therapies After Galeterone in Patients With Castration-resistant Prostate Cancer. | LitMetric

AI Article Synopsis

Article Abstract

Background: Galeterone is a multi-targeted agent with activity as a CYP17 inhibitor, androgen receptor antagonist, and also causes androgen receptor degradation. It has shown meaningful anti-tumor activity with a well-tolerated safety profile in patients with castration-resistant prostate cancer (CRPC) in phase I and II studies; however, the efficacy of currently approved CRPC therapies after treatment with galeterone is unknown. In this study, we evaluate prostate specific antigen (PSA) response of non-protocol therapies following galeterone in a subset of patients treated on the Androgen Receptor Modulation Optimized for Response (ARMOR) 2 study.

Patients And Methods: Patients who received any subsequent treatment were included. PSA response and treatment duration were summarized by line and type of subsequent therapy.

Results: Overall, 27 of 40 patients received ≥ 1 post-galeterone treatment, of whom 18 (67%) discontinued galeterone for progression, 14 (52%) received ≥ 2 treatments, and 6 (22%) received ≥ 3 treatments. PSA changed by a median of -36%, -35%, and +60% in patients receiving first-line, second-line, and third-line therapy, respectively. Overall, 18 (67%) received subsequent enzalutamide, 12 (44%) received docetaxel, 9 (33%) received abiraterone, and 5 (19%) received cabazitaxel. PSA changed by a median of -27%, -34%, -39%, and 17% for patients receiving subsequent enzalutamide, docetaxel, abiraterone, and cabazitaxel, respectively, at any line.

Conclusion: We demonstrate that CRPC therapies exhibit differential anti-tumor activity following galeterone. In this small cohort, abiraterone demonstrates the highest PSA response post-galeterone, whereas enzalutamide and chemotherapy have more modest activity. Larger clinical studies are warranted to fully evaluate the efficacy and safety of second-generation hormonal agents and chemotherapy post-galeterone. Predictive biomarkers will be critical to optimizing patient selection for sequential therapies.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853188PMC
http://dx.doi.org/10.1016/j.clgc.2016.10.006DOI Listing

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