A Study of Nipocalimab Administered to Adults With Generalized Myasthenia Gravis

  • End date
    May 15, 2026
  • participants needed
  • sponsor
    Janssen Research & Development, LLC
Updated on 31 December 2021
generalized myasthenia gravis


The purpose of this study is to evaluate the efficacy and safety of nipocalimab compared to placebo in participants with generalized myasthenia gravis (gMG).


Myasthenia gravis (MG) is a rare, heterogeneous, neuromuscular disease characterized by fluctuating, fatigable muscle weakness. MG is caused by pathogenic autoantibodies that impair cholinergic transmission in the postsynaptic membrane at the neuromuscular junction and impair or prevent muscle contraction. Nipocalimab (also referred to as JNJ-80202135 or M281) is a fully human, aglycosylated immunoglobulin (Ig)G1 monoclonal antibody (mAb) designed to selectively bind, saturate, and block the IgG binding site on the endogenous neonatal Fc receptor (FcRn). This study will consist of a screening phase (up to 4 weeks), treatment phase (a 24-week double-blind placebo-controlled phase, and an open-label extension [OLE] phase [up to 2 years]) and a follow-up safety visit (up to 8 weeks after last infusion of study intervention). Efficacy evaluations will include assessments such as Myasthenia Gravis

  • Activities of Daily Living (MG-ADL) score. Safety evaluations (such as adverse events, physical examination, vital signs, electrocardiogram [ECG], and clinical laboratory tests) will be performed. The overall duration of study will be up to 4 years and 8 months.

Condition Myasthenia Gravis
Treatment Placebo, Nipocalimab
Clinical Study IdentifierNCT04951622
SponsorJanssen Research & Development, LLC
Last Modified on31 December 2021


Yes No Not Sure

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

Exclusion Criteria

Has any confirmed or suspected clinical immunodeficiency syndrome not related to treatment of his/her gMG, or has a family history of congenital or hereditary immunodeficiency unless confirmed absent in the participant
Has MGFA Class I disease or presence of MG crisis (MGFA Class V) at screening, history of MG crisis within 1 month of screening, or fixed weakness (and/or 'burnt out' MG)
Has had a thymectomy within 12 months prior to screening, or thymectomy is planned during the study
Has known allergies, hypersensitivity, or intolerance to nipocalimab or its excipients
Has experienced myocardial infarction, unstable ischemic heart disease, or stroke within 12 weeks of screening
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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