Targeting the androgen receptor confers in vivo cross-resistance between enzalutamide and docetaxel, but not cabazitaxel, in castration-resistant prostate cancer

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Van Soest R.J., De Morrée E.S., Kweldam C.F., De Ridder C.M.A., Wiemer E.A.C., Mathijssen R.H.J., De Wit R., Van Weerden W.M.

European Urology 2015 67:6 (981-985)

Treatment options for metastatic castration-resistant prostate cancer (CRPC) have evolved with the established benefit of the novel androgen receptor (AR)-targeted agents abiraterone and enzalutamide in the prechemotherapy setting. However, concerns regarding cross-resistance between the taxanes docetaxel and cabazitaxel and these AR-targeted agents have arisen, and the optimal drug treatment sequence is unknown. We investigated the in vivo efficacy of docetaxel and cabazitaxel in enzalutamide-resistant CRPC, and mechanisms of cross-resistance between these agents. Castrated mice harboring enzalutamide-resistant tumors and enzalutamide-naïve tumors were treated with docetaxel and cabazitaxel. Tumor growth kinetics, AR nuclear localization, AR-regulated gene expression, Ki67 expression, and serum levels of prostate-specific antigen, docetaxel, and cabazitaxel were analyzed. Docetaxel inhibited tumor growth, AR nuclear localization, and…(vermás)

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