Progression-Free Survival With Encalutamide for Prostate Cancer: New Trial Results
Astellas Pharma and Medivation announced topline results from the Phase 2 STRIVE trial comparing enzalutamide with bicalutamide in men with non-metastatic or metastatic castration-resistant prostate cancer.
The STRIVE trial randomized 257 patients with metastatic prostate cancer and 139 patients with non-metastatic prostate cancer whose disease progressed despite treatment with a luteinizing hormone-releasing hormone (LHRH) analogue therapy or following surgical castration. The primary endpoint of the trial was progression-free survival (PFS).
The study achieved its primary endpoint demonstrating a statistically significant increase in PFS for enzalutamide compared with bicalutamide (HR 0.24; 95% CI, 0.18–0.32; p<0.0001). Median PFS was 19.4 months in the enzalutamide group compared with 5.7 months in the bicalutamide group. The median time on treatment in the STRIVE trial was 14.7 months in the enzalutamide group vs. 8.4 months in the bicalutamide group.