A US Phase 3b Study Comparing Remibrutinib and Dupilumab as Add-On Treatments for Adults With Moderate to Severe Chronic Spontaneous Urticaria Not Controlled by Second Generation H1-Antihistamines

What this Trial Is About

Researchers are evaluating the effectiveness of remibrutinib compared to dupilumab as add-on treatments for adults with moderate to severe chronic spontaneous urticaria CSU that is not well controlled by second generation H1-antihistamines sgH1-AH. This Phase 3b, multi-center, randomized, double-blind, double-dummy study focuses on early treatment effects within 4 weeks. The study addresses the need for better management of CSU symptoms such as hives and itch. Participants will be assigned to one of two treatment groups one group will receive remibrutinib tablets twice daily plus placebo injections, while the other group will receive dupilumab injections with matching placebo tablets. Both groups continue their stable background therapy of sgH1-AH daily. The study includes a screening period up to 4 weeks, a 12-week core double-blind treatment period, and an optional 12-week open-label extension where all participants may receive remibrutinib if it is not commercially available. After treatment, safety follow-up occurs for up to 12 weeks, with phone calls and possible site visits. Participants will be monitored through regular assessments including symptom severity scores, urticaria activity scores, and daily diaries. Safety follow-up includes phone calls and visits depending on treatment continuation. The main outcome is the change in weekly urticaria activity score at Week 4. Other measures include severity of hives and itch at Weeks 1 and 4. Total study participation may last up to 24 weeks, including optional extension and follow-up phases.

A Study to Evaluate Efficacy of Remibrutinib Compared to Dupilumab at Early Timepoints in Adults With Chronic Spontaneous Urticaria Inadequately Controlled by Second Generation H1-antihistamines