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Radiographic progression-free survival (A) and overall survival (B) in chemotherapy-naïve metastatic castration-resistant prostate cancer patients treated with abiraterone acetate (AA) plus prednisone (P) or placebo plus P as a function of Gleason score (<8 and ≥8) at initial diagnosis. AA, abiraterone acetate; CI, confidence interval; HR, hazard ratio; P, prednisone.
