A Study to Investigate the Efficacy, Safety and Tolerability of Remibrutinib Versus Placebo in Adult Patients With Generalized Myasthenia Gravis

A study to evaluate the efficacy, safety and tolerability of Remibrutinib versus placebo in adult patients with Generalized Myasthenia Gravis who are on stable, standard-of-care (SOC) treatment.

This study is a randomized, double-blind, placebo-controlled, multicenter, Phase III study, to evaluate the efficacy, safety and tolerability of remibrutinib in gMG patients who are on stable SOC treatment. Approximately 180 eligible participants will be randomized in a ratio of 1:1, to receive either remibrutinib or matching placebo. The study consists of a Core Part (6-months double-blind treatment) and an Extension Part (up to 60-month open-label treatment).

Inclusion Criteria: * Adult patients with gMG (age 18-75 years) * Confirmed diagnosis of Myasthenia Gravis Foundation of America (MGFA) Class II-IV gMG at screening and likely not in need of a respirator for the duration of the study, as judged by the Investigator * Documented evidence of positive serologic testing for AChR+ antibody or MuSK+ antibody at screening, OR seronegative for both AChR and MuSK antibodies at screening * Baseline MG-ADL score ≥ 6 with ≥ 50% of the total score due to non ocular symptoms * Participants who have been on a stable dose of standard-of-care treatment as specified in the protocol * Able to safely swallow the study medication according to investigator clinical judgement based on a bedside swallowing test or another formal swallowing test in line with local practice, both at Screening and Baseline Exclusion Criteria: * Prior to baseline have been treated with intravenous immunoglobulins or plasma exchange (IVIg/PLEX) in the past month, with rituximab in the past 6 months, eculizumab in the past 2 months, ravulizumab or other complement inhibitors in the past 3 months, efgartigimod or other anti-FcRn therapies in the past 3 months, or had a thymectomy in the past 6 months or a planned thymectomy during the trial period * Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, unless they are using highly effective methods of contraception during dosing and for 1 week after stopping of study treatment Other protocol-defined inclusion/exclusion criteria may apply.