A Study of Nipocalimab Administered to Adults With Generalized Myasthenia Gravis
Trial Parameters
Brief Summary
The purpose of this study is to evaluate the efficacy and safety of nipocalimab compared to placebo in participants with generalized myasthenia gravis (gMG). The purpose of the subcutaneous substudy is to evaluate how well it works in the body (pharmacodynamic \[PD\]) when given as an injection under the skin (subcutaneous) compared to when given through a vein (intravenous) in participants with gMG.
Eligibility Criteria
Inclusion Criteria: * Diagnosis of myasthenia gravis (MG) with generalized muscle weakness meeting the clinical criteria for generalized myasthenia gravis (gMG) as defined by the Myasthenia Gravis Foundation of America (MGFA) Clinical Classification Class II a/b, III a/b, or IVa/b at screening * Myasthenia Gravis - Activities of Daily Living (MG-ADL) score of greater than or equal to (\>=) 6 at screening and baseline * Has sufficient venous access to allow drug administration by infusion and blood sampling as per the protocol * A woman of childbearing potential must have a negative highly sensitive serum (beta-human chorionic gonadotropin \[beta-hCG\]) at screening and a negative urine pregnancy test at Day 1 prior to administration of study intervention * A male participant must agree not to donate sperm for the purpose of reproduction during the study and for a minimum 90 days after receiving the last administration of study intervention * For the SC Substudy (Cohort 1 and Cohort 2):