NCT04980495CompletedPhase 3
An Open-label Study to Investigate the Clinical Efficacy of Different Dosing Regimens of Efgartigimod IV in Patients With Generalized Myasthenia Gravis
A Phase 3b, Randomized, Open-label, Parallel-Group Study to Evaluate Different Dosing Regimens of Intravenous Efgartigimod to Maximize and Maintain Clinical Benefit in Patients With Generalized Myasthenia Gravis
Source: ClinicalTrials.gov · Last updated 27 May 2026
Brief summary (registry, in English)
The purpose of this open-label study is to investigate the efficacy, safety, and tolerability of a continuous regimen of efgartigimod compared with a cyclic regimen in participants with Generalized Myasthenia Gravis (gMG). Participants will receive efgartigimod throughout the study. The participants will be randomized to the continuous regimen arm or to the cyclic regimen arm. The study consists of a part A (regimen comparison period) where participants will continue the treatment based on the treatment regimen arm they were assigned at randomization. Following part A, participants will enter part B (extension period) where all participants will receive efgartigimod in the continuous regimen. The study duration for participants is up to 138 weeks.
- Status (registry)
- Completed
- Phase (registry)
- Phase 3
- Study type
- Interventional
- Enrollment
- 69 (actual)
- First submitted
- 19 Jul 2021
- Start date
- 16 Dec 2021
- Primary completion date
- 24 Aug 2023
- Lead sponsor
- argenx
- Diseases
- Myasthenia gravis
- NCT number
- NCT04980495
- EU CT number
- 2024-510932-36-00
- EudraCT number
- 2021-002504-12
What you commit to
- Study type: Interventional · Phase 3
- Participants enrolled: 69
- From 16 Dec 2021 to the primary completion date, 24 Aug 2023
- 35 sites in 11 countries
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Use of the following prior or concomitant therapies:
- intravenous immunoglobulin (IVIg) or subcutaneous immunoglobulin (SCIg) within 14 days of day 1
- Rituximab within 6 months of day 1
- Eculizumab within 1 month of day 1
- Other monoclonal antibodies (eg, adalimumab, tocilizumab, ixekizumab)
Other illness
- Any other condition that, in the opinion of the investigator, would interfere with an accurate assessment of the clinical symptoms of gMG and/or put the participant at undue risk
Other
- A thymectomy within 3 months of screening
Who the study is looking for
- At least 18 years of age, at the time of signing the informed consent.
- Diagnosed with Generalized Myasthenia Gravis (gMG) with confirmed documentation and supported by a physical exam and confirmed seropositivity for anti-acetylcholine receptor antibodies (AChR-Abs).
- Meets the clinical criteria as defined by the Myasthenia Gravis Foundation of America (MGFA) class II, III, or IV
Age in the registry: 18 years to - · Sex: All · Does not accept healthy volunteers
Sites (35)
Sites in registry order. Save your city in your profile to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Medical University of Vienna Coordinator of this site? Confirm its status | Vienna | Austria | Completed |
| UZ Leuven Coordinator of this site? Confirm its status | Leuven | Belgium | Completed |
| Investigator Site 29 - CA0019003 Coordinator of this site? Confirm its status | London | Canada | Unknown status |
| Investigator site 37 - CA0019002 Coordinator of this site? Confirm its status | Québec | Canada | Unknown status |
| Charite Universitaetsmedizin Berlin KöR Coordinator of this site? Confirm its status | Berlin | Germany | Completed |
| Universitaetsklinikum Essen (AoR) Coordinator of this site? Confirm its status | Essen | Germany | Completed |
| Hospital de la Santa Creu i Sant Pau Coordinator of this site? Confirm its status | Barcelona | Spain | Completed |
| Complexo Hospitalario Universitario De Santiago Coordinator of this site? Confirm its status | Santiago de Compostela | Spain | Completed |
| Centre hospitalier Universitaire de Bordeaux Coordinator of this site? Confirm its status | Bordeaux | France | Completed |
| Centre Hospitalier Universitaire De Lille Coordinator of this site? Confirm its status | Lille Cedex | France | Completed |
| Centre Hospitalier Regional De Marseille Coordinator of this site? Confirm its status | Marseille | France | Completed |
| Centre Hospitalier Universitaire de Nice Coordinator of this site? Confirm its status | Nice | France | Completed |
| Assistance Publique Hopitaux De Paris Coordinator of this site? Confirm its status | Paris Cedex 13 | France | Completed |
| Investigator Site 3 - GEO9950003 Coordinator of this site? Confirm its status | Tbilisi | Georgia | Unknown status |
| Investigator Site 1 - GEO9950001 Coordinator of this site? Confirm its status | Tbilisi | Georgia | Unknown status |
| Investigator Site 2 - GEO9950002 Coordinator of this site? Confirm its status | Tbilisi | Georgia | Unknown status |
| IRCCS Ospedale Policlinico San Martino Coordinator of this site? Confirm its status | Genoa | Italy | Completed |
| IRCCS Foundation Istituto Neurologico Carlo Besta Coordinator of this site? Confirm its status | Milan | Italy | Completed |
| Azienda Ospedaliero Universitaria Pisana Coordinator of this site? Confirm its status | Pisa | Italy | Completed |
| Fondazione Policlinico Universitario Agostino Gemelli IRCCS Coordinator of this site? Confirm its status | Rome | Italy | Completed |
| Investigator Site 35 - NL0310001 Coordinator of this site? Confirm its status | Amsterdam | Netherlands | Unknown status |
| Michalski I Partnerzy Lekarze sp.p. Coordinator of this site? Confirm its status | Cracow | Poland | Completed |
| Clinirem Sp. z o.o. Coordinator of this site? Confirm its status | Lublin | Poland | Completed |
| Investigator Site 16 - US0010009 Coordinator of this site? Confirm its status | Augusta | United States | Unknown status |
| Investigator Site 11 - US0010011 Coordinator of this site? Confirm its status | Austin | United States | Unknown status |
| - Coordinator of this site? Confirm its status | Boca Raton | United States | Unknown status |
| Investigator Site 10 - US0010007 Coordinator of this site? Confirm its status | Carlsbad | United States | Unknown status |
| Investigator Site 8 - US0010003 Coordinator of this site? Confirm its status | Chicago | United States | Unknown status |
| Investigator Site 15 - US0010014 Coordinator of this site? Confirm its status | Coral Springs | United States | Unknown status |
| Investigator Site 12 - US0010004 Coordinator of this site? Confirm its status | Kansas City | United States | Unknown status |
| Investigator Site 6 - US0010008 Coordinator of this site? Confirm its status | Meadows | United States | Unknown status |
| Investigator Site 7 - US0010001 Coordinator of this site? Confirm its status | Orange | United States | Unknown status |
| Investigator Site 17 - US0010012 Coordinator of this site? Confirm its status | Philadelphia | United States | Unknown status |
| Investigator Site 13 - US0010013 Coordinator of this site? Confirm its status | Portland | United States | Unknown status |
| Investigator Site 14 - US0010010 Coordinator of this site? Confirm its status | Richmond | United States | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.