Isesaki

This multinational, multicenter, randomized, double-blind, placebo-controlled Phase 3 study is designed to evaluate the efficacy and safety of duvakitug in participants with moderately to severely active Crohn's Disease. The study includes three sub-studies focusing on induction treatment, with specific co-primary endpoints assessing clinical remission and endoscopic response at 12 weeks. Participants will receive either duvakitug or a placebo via subcutaneous injection during the treatment periods. The study duration can last up to 35 weeks and consists of a screening period of up to 5 weeks, followed by a 12-week induction phase in either Sub-Study 1 (open-label feeder induction) or Sub-Study 2 (pivotal induction). Non-responders may enter a 12-week extended induction phase in Sub-Study 3. After treatment, participants not enrolling in the maintenance study will have a 6-week follow-up period. Throughout the study, participants will have scheduled visits for assessments, including monitoring of clinical remission and endoscopic response using standardized scoring systems at 12 weeks. The total number of visits varies depending on sub-study participation, with up to 15 visits for those in Sub-Study 3. Safety and treatment effects will be closely monitored during these visits and follow-up periods.