Phase III Study of Abiraterone Acetate (II) Versus Abiraterone Acetate in Patients with MCRPC

Acetate abiraterone tablets (II) is a modified new drug launched in China, prepared using nanocrystal technology and supplemented with SNAC as an absorption enhancer, working together to promote the gastrointestinal absorption of Abiraterone, improve its oral bioavailability, and reduce its pharmacokinetic variability within individuals, as well as the impact of food on its pharmacokinetics. According to preliminary research results, the exposure to 300mg acetate abiraterone tablets (II) under fasting conditions is not less than the exposure to the original Zeke® 1000mg, and the food effect of acetate abiraterone tablets (II) is small, allowing for medication without dietary restrictions. The registration study uses steady-state serum testosterone levels as the primary pharmacodynamic indicator, comparing the efficacy of 300mg acetate Abiraterone tablets (II) and 1000mg Zeke® in mCRPC patients to be equivalent, with a safety advantage.This study is a non-inferior phase III, open-label, randomized controlled, multicenter trial. The study planned to enroll 400 mCRPC subjects and randomly assign them to the experimental group or the control group in a 1:1 ratio. The experimental group was treated with abiraterone acetate tablets (II.) combined with prednisone, and the control group was treated with abiraterone acetate tablets combined with prednisone, and the primary endpoints were PSA50 response rate and safety.To assess whether the efficacy (PSA50) of Abiraterone Acetate Tablets (II) is statistically non-inferior to that of Abiraterone Acetate Tablets, and whether there is a significant reduction in the incidence of grade 3 and above TEAEs.