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NCT05374590Enrolling by invitationPhase 2/3

Evaluating Long-term Safety of Efgartigimod Administered Intravenously and Efgartigimod PH20 Administered Subcutaneously in Children With Generalized Myasthenia Gravis

A Long-term, Single-Arm, Open-label, Multicenter Trial to Evaluate Safety of Efgartigimod Administered Intravenously and Efgartigimod PH20 Administered Subcutaneously in Children With Generalized Myasthenia Gravis

Source: ClinicalTrials.gov · Last updated 3 Nov 2026

Brief summary (registry, in English)

The purpose of this trial is to evaluate the long-term safety of efgartigimod IV and efgartigimod PH20 SC administered to participants with gMG in the antecedent studies, ARGX-113-2006 and ARGX-113-2207, respectively. Participants will receive efgartigimod IV or efgartigimod PH20 SC, using the dose administered in the antecedent studies. Participants who have not reached the age of 18 can remain in the study until efgartigimod becomes commercially available in the respective country or available through another continued access program for gMG. Participants who have reached the age of 18 can remain in the study for a maximum of 2 years, until efgartigimod becomes commercially available in the respective country or available through another continued access program for gMG, whichever comes first.

Status (registry)
Enrolling by invitation
Phase (registry)
Phase 2/3
Study type
Interventional
Enrollment
12 (estimated)
First submitted
1 Apr 2022
Start date
18 Aug 2022
Primary completion date
Sept 2029
Lead sponsor
argenx
NCT number
NCT05374590
EU CT number
2023-507379-23-00
EudraCT number
2021-002460-46

What you commit to

  • Study type: Interventional · Phase 2/3
  • Planned participants: 12
  • From 18 Aug 2022 to the primary completion date, Sept 2029
  • 25 sites in 13 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.

Other illness

  • Clinically significant uncontrolled chronic bacterial, viral, or fungal infection at study entry not sufficiently resolved in the investigator's opinion or known autoimmune disease or any medical condition that would interfere with an accurate assessment of clinical symptoms of gMG or put the participant at undue risk.

Other

  • Female adolescents of childbearing potential (FAOCBP): Pregnancy or lactation, or the participant intends to become pregnant during their participation in the study.
  • Discontinued early from ARGX-113-2006 or ARGX-113-2207 treatment.

Who the study is looking for

  • The participant completed ARGX-113-2006, defined as:
    • The participant reached End of Trial in trial ARGX-113-2006 or End of Study in ARGX-113-2207 and agreed to participate in the ARGX-113-2008 trial.
    • The participant qualifies for retreatment in trial ARGX-113-2006, but cannot complete a Treatment Period (TP) and the required Intertreatment Period (IP) visits within the ARGX-113-2006 trial's timeframe.
  • Either the participant or the participant's legally authorized representative can understand the requirements of the trial and provide written informed consent/assent, and willingness and ability to comply with the trial protocol procedures.
  • Contraceptive use for sexually active participants should be consistent with local regulations for those participating in clinical studies.

Age in the registry: 2 years to 18 years · Sex: All · Does not accept healthy volunteers

Full criteria on ClinicalTrials.gov

Sites (25)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
Medical University of Vienna
Coordinator of this site? Confirm its status
ViennaAustriaCompleted
Antwerp University Hospital
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EdegemBelgiumRecruiting
Universitair Ziekenhuis Gent
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GentBelgiumRecruiting
Alberta Childrens Hospital
Coordinator of this site? Confirm its status
CalgaryCanadaUnknown status
Childrens Hospital of Eastern Ontario
Coordinator of this site? Confirm its status
OttawaCanadaUnknown status
Fakultni nemocnice Brno
Coordinator of this site? Confirm its status
BrnoCzechiaNot yet recruiting
Fakultni nemocnice Ostrava
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OstravaCzechiaNot yet recruiting
Charite Universitaetsmedizin Berlin KöR
Coordinator of this site? Confirm its status
BerlinGermanyRecruiting
Universitaetsklinikum Essen (AoR)
Coordinator of this site? Confirm its status
EssenGermanyRecruiting
Sant Joan De Deu Barcelona Hospital
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Esplugues De LlobregatSpainRecruiting
Hospital Universitario Y Politecnico La Fe
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ValenciaSpainRecruiting
Centre Hospitalier Regional De Marseille
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MarseilleFranceRecruiting
Hopital Necker Enfants Malades
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ParisFranceRecruiting
Great Ormand Street Hospital for Children NHS Foundation Trust - Great Ormond Street Hospital - Pediatric Neurology
Coordinator of this site? Confirm its status
LondonUnited KingdomUnknown status
Oxford University Hospitals NHS Foundation Trust - John Radcliffe Hospital Children's Hospital
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OxfordUnited KingdomUnknown status
Hadassah Medical Center - Ein Kerem
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JerusalemIsraelUnknown status
Azienda Ospedaliera Universitaria Meyer IRCCS
Coordinator of this site? Confirm its status
FlorenceItalyNot yet recruiting
IRCCS Istituto Giannina Gaslini
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GenoaItalyNot yet recruiting
Academisch Ziekenhuis Leiden
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LeidenNetherlandsRecruiting
Uniwersyteckie Centrum Kliniczne
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GdanskPolandRecruiting
Neurologia Śląska Centrum Medyczne
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KatowicePolandRecruiting
Uniwersyteckie Centrum Kliniczne Warszawskiego Uniwersytetu Medycznego
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WarsawPolandRecruiting
Atrium Health Neurology Specialty Care
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CharlotteUnited StatesUnknown status
University of Virginia (UVA) Health - Developmental Pediatrics Clinic
Coordinator of this site? Confirm its status
CharlottesvilleUnited StatesUnknown status
Ann and Robert H Lurie Children's Hospital of Chicago - Main Hospital
Coordinator of this site? Confirm its status
ChicagoUnited StatesUnknown status

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