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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
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

Full criteria on ClinicalTrials.gov

Sites (35)

Sites in registry order. Save your city in your profile to sort them by distance.

SiteCityCountrySite status
Medical University of Vienna
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ViennaAustriaCompleted
UZ Leuven
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LeuvenBelgiumCompleted
Investigator Site 29 - CA0019003
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LondonCanadaUnknown status
Investigator site 37 - CA0019002
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QuébecCanadaUnknown status
Charite Universitaetsmedizin Berlin KöR
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BerlinGermanyCompleted
Universitaetsklinikum Essen (AoR)
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EssenGermanyCompleted
Hospital de la Santa Creu i Sant Pau
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BarcelonaSpainCompleted
Complexo Hospitalario Universitario De Santiago
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Santiago de CompostelaSpainCompleted
Centre hospitalier Universitaire de Bordeaux
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BordeauxFranceCompleted
Centre Hospitalier Universitaire De Lille
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Lille CedexFranceCompleted
Centre Hospitalier Regional De Marseille
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MarseilleFranceCompleted
Centre Hospitalier Universitaire de Nice
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NiceFranceCompleted
Assistance Publique Hopitaux De Paris
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Paris Cedex 13FranceCompleted
Investigator Site 3 - GEO9950003
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TbilisiGeorgiaUnknown status
Investigator Site 1 - GEO9950001
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TbilisiGeorgiaUnknown status
Investigator Site 2 - GEO9950002
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TbilisiGeorgiaUnknown status
IRCCS Ospedale Policlinico San Martino
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GenoaItalyCompleted
IRCCS Foundation Istituto Neurologico Carlo Besta
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MilanItalyCompleted
Azienda Ospedaliero Universitaria Pisana
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PisaItalyCompleted
Fondazione Policlinico Universitario Agostino Gemelli IRCCS
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RomeItalyCompleted
Investigator Site 35 - NL0310001
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AmsterdamNetherlandsUnknown status
Michalski I Partnerzy Lekarze sp.p.
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CracowPolandCompleted
Clinirem Sp. z o.o.
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LublinPolandCompleted
Investigator Site 16 - US0010009
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AugustaUnited StatesUnknown status
Investigator Site 11 - US0010011
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AustinUnited StatesUnknown status
-
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Boca RatonUnited StatesUnknown status
Investigator Site 10 - US0010007
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CarlsbadUnited StatesUnknown status
Investigator Site 8 - US0010003
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ChicagoUnited StatesUnknown status
Investigator Site 15 - US0010014
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Coral SpringsUnited StatesUnknown status
Investigator Site 12 - US0010004
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Kansas CityUnited StatesUnknown status
Investigator Site 6 - US0010008
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MeadowsUnited StatesUnknown status
Investigator Site 7 - US0010001
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OrangeUnited StatesUnknown status
Investigator Site 17 - US0010012
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PhiladelphiaUnited StatesUnknown status
Investigator Site 13 - US0010013
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PortlandUnited StatesUnknown status
Investigator Site 14 - US0010010
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RichmondUnited StatesUnknown status

This page is information, not medical advice. Discuss any trial with your doctor.