This is a randomized, open-label, multi-center study comparing the safety and efficacy of XRP6258 plus prednisone to mitoxantrone plus prednisone in the treatment of hormone refractory metastatic prostate cancer previously treated with a Taxotere®-containing regimen. The primary objective is overall survival. Secondary objectives include progression free survival, overall response rate, prostate-specific antigen (PSA) response/progression, pain response/progression, overall safety, and pharmacokinetics. Patients will be treated until disease progression, death, unacceptable toxicity, or for a maximum of 10 cycles. Patients will have long-term follow-up for a maximum of up to 2 years.
25 mg/m\^2 administered by intravenous (IV) route over 1 hour on day 1 of each 21-day cycle
12 mg/m\^2 administered by intravenous (IV) route over 15-30 minutes on day 1 of each 21-day cycle
10 mg daily administered by oral route
Buenos Aires, Argentina