clinical trial Phase II/III Trial Trial Phase 2-3 A class of clinical study that combines elements characteristic of traditional Phase II and Phase III trials. Trials that are a combination of phases 2 and 3. C1519042 phase II/III trial Phase_II_III_Trial Phase II/III Trial CDISC Research Activity Trial Phase 2/3 2-3 Phase II/III Trial A trial to study response to a new treatment and the effectiveness of the treatment compared with the standard treatment regimen. A type of clinical study that combines elements characteristic of traditional Phase II and Phase III trials. PHASE II/III TRIAL C15694