JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL

Enzalutamide: a novel antiandrogen for patients with castrate-resistant prostate cancer

Jean Hoffman-Censits, Wm Kevin Kelly
Clinical Cancer Research: An Official Journal of the American Association for Cancer Research 2013 March 15, 19 (6): 1335-9
23300275
Enzalutamide (MDV3100, Xtandi, Medivation\Astellas) is an oral inhibitor of androgen receptor signaling that blocks androgen receptor interaction, inhibits translocation of the androgen receptor to the nucleus, impairs androgen receptor binding to DNA, and inhibits coactivator recruitment and receptor-mediated DNA transcription. In a phase III randomized study comparing enzalutamide with placebo in men with progressive castration-resistant prostate cancer (CRPC) who were previously treated with docetaxel, enzalutamide showed an improvement in overall survival (18.4 vs. 13.6 months, HR, 0.63; P < 0.001). In addition, all secondary endpoints including proportion of patients with prostate-specific antigen (PSA) decline, soft-tissue response, quality-of-life response, time to PSA progression, radiographic progression-free survival, and the time to the first radiographic skeletal event all significantly favored patients treated with enzalutamide. Fatigue, diarrhea, and hot flashes were common in patients treated with enzalutamide, with seizures reported in 5 (0.6%) of the patients. Enzalutamide is a novel therapy that very potently blocks the androgen signaling pathway, which is unregulated during the development of CRPC. The preclinical studies along with the pivotal trials that led to its approval by the U.S. Food and Drug Administration (FDA) in September 2012 will be reviewed.

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