Clinical trial Recruiting at 18 sites Phase 4 Interventional Ages 18 and up

Evaluating Efgartigimod PH20 SC in Adults with New-onset Generalized Myasthenia Gravis

Official title: A Phase 4, Open-Label, Prospective, Single-Group, Multicenter Study to Evaluate the Clinical Outcomes of Efgartigimod PH20 SC in Adult Participants With New-Onset Generalized Myasthenia Gravis

Run by argenx · NCT06909214 · Data updated 2026-11-12

This study is testing a new treatment called efgartigimod PH20 SC to see if it helps adults who have recently been diagnosed with generalized myasthenia gravis feel better.

Quick facts

PhasePhase 4
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment30 (estimated)
Sponsorargenx
Industry-sponsored
Locations18 sites (La Jolla, California and 17 other locations)
StatusRecruiting
StartedApril 17, 2025
Main results expectedAugust 2026
Study endsMay 2027
Registry record updatedMarch 10, 2026
Trial IDNCT06909214 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18 and older who have been diagnosed with gMG of MGFA class II, III, or IV and are seropositive for AChR-Ab.

Probably not a fit

Patients with a diagnosis of MGFA class I or V, those who have undergone thymectomy prior to screening, or those who have used systemic corticosteroids or immunosuppressive therapy for gMG will not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study aims to assess the clinical outcomes of efgartigimod PH20 SC in adults diagnosed with new-onset generalized myasthenia gravis (gMG), specifically those who have experienced symptoms for less than one year. Participants will undergo a treatment period lasting 51 weeks, with the overall study duration for each individual being approximately 58 weeks. The study focuses on treatment-naive patients or those who have only received AChEI therapy for gMG. The effectiveness of the treatment will be measured through various clinical outcomes.

Why it matters

Potential benefit: If successful, this treatment could significantly improve the management and outcomes for patients with new-onset generalized myasthenia gravis.

How similar studies have gone: While this specific approach may be novel, similar studies evaluating treatments for generalized myasthenia gravis have shown promising results.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Is at least 18 years when signing the ICF
* Has been diagnosed with gMG of MGFA class II, III, or IV
* Is seropositive for AChR-Ab
* Is treatment-naive for gMG or has been administered AChEI for the treatment of gMG
* Had onset of generalized MG signs and/or symptoms within 12 months before screening; candidates who also had onset of ocular MG signs and/or symptoms within 24 months before screening may be enrolled in the study
* Has an MG-ADL score ≥5

Exclusion Criteria:

* gMG diagnosis of MGFA class I or V
* Underwent a thymectomy prior to screening, except thymectomy for treatment of nonmalignant thymoma prior to the gMG diagnosis
* Prior or current use of any of any systemic corticosteroid therapy or nonsteroidal immunosuppressive therapy for the treatment of gMG

Where it's running

  • University of California, San Diego - Altman Clinical and Translational Research Institute (ACTRI)
    La Jolla, California, United States
    Recruiting
  • Samir Macwan, M.D., Inc. (S corporation)
    Rancho Mirage, California, United States
    Recruiting
  • EZR Research
    Boca Raton, Florida, United States
    Recruiting
  • University of Florida Jacksonville
    Jacksonville, Florida, United States
    Recruiting
  • Visionary Investigators Network
    Miami, Florida, United States
    Recruiting
  • University of California Irvine
    Orange, Florida, United States
    Recruiting
Show 12 more locations
  • Medsol Clinical Research Center Inc
    Port Charlotte, Florida, United States
    Recruiting
  • Baycare Medical Group
    St. Petersburg, Florida, United States
    Recruiting
  • Emory Brain Health Center
    Atlanta, Georgia, United States
    Recruiting
  • The Queen's Medical Center - West Oahu
    Honolulu, Hawaii, United States
    Recruiting
  • Hawaii Pacific Neuroscience
    Honolulu, Hawaii, United States
    Recruiting
  • HSHS Medical Group
    O'Fallon, Illinois, United States
    Recruiting
  • UMass Memorial Medical Center
    Worcester, Massachusetts, United States
    Recruiting
  • Henry Ford Health System
    Detroit, Michigan, United States
    Recruiting
  • Cleveland Clinic
    Cleveland, Ohio, United States
    Recruiting
  • Erlanger Neuroscience Institute
    Chattanooga, Tennessee, United States
    Recruiting
  • Central Texas Neurology Consultants - Elligo
    Round Rock, Texas, United States
    Recruiting
  • Center for Neurological Disorders - Greenfield
    Greenfield, Wisconsin, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.