The primary objective was to confirm the effect of tasquinimod in delaying disease progression or death as compared with placebo in chemo-naïve patients with metastatic castrate-resistant prostate cancer (mCRPC). Secondary objectives included further evaluation of the safety profile of tasquinimod, comparison of clinical benefits (such as overall survival and symptoms) of tasquinimod with placebo, to evaluate the quality of life impact and to determine the pharmacokinetics of tasquinimod.