NCT07856329

Microdystrophin (GNT0004) Gene Therapy Clinical Trial in Duchenne Muscular Dystrophy: A Phase I/II/III Study With a Dose Determination Part Followed by an Efficacy and Safety Evaluation, Quadruple Blind Placebo-controlled Part and Then by a Long-term Safety Follow up Part, in Ambulant Boys

Study Summary

GNT0004 is a recombinant adeno-associated viral (AAV) vector gene therapy composed of an AAV8 serotype capsid containing a sequence-optimized gene for a human microdystrophin. Duchenne muscular dystrophy (DMD) is a neuromuscular disorder caused by dystrophin gene mutations leading to absence of functional dystrophin, a key protein that prevents muscle cell damage during physiological contractions. To address the underlying cause of the disease, GNT0004 delivers an optimized dystrophin gene that is capable to produce a shortened but functional dystrophin protein in target tissues (heart and skeletal muscles) in DMD subjects. It is expected to significantly delay or slow disease progression. GNT0004 will be given as a one-time intravenous (IV) infusion to help it reach muscles throughout the body.

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Interventions

GNT0004 (1x10e13 vg/kg)GENETIC
Single intravenous administration of GNT0004
GNT0004 (3x10e13 vg/kg)GENETIC
Single intravenous administration of GNT0004
PlaceboGENETIC
Single intravenous administration of GNT0004 placebo (IMP placebo)

Study Locations

FacilityCityStateCountry
Hôpital Universitaire des Enfants Reine FabiolaBrusselsBelgium
UZ LeuvenLeuvenBelgium
Hôpital de la CitadelleLiègeBelgium
University Hospital of BordeauxBordeauxFrance
Brest University Hospital CentreBrestFrance
Hôpital Femme Mère EnfantBronFrance
CHU LilleLilleFrance
Centre Hospitalier Universitaire De MontpellierMontpellierFrance
Institut I-Motion, Hôpital Armand TrousseauParisFrance
Hôpitaux Universitaires de StrasbourgStrasbourgFrance
Hospital Sant Joan de Déu BarcelonaEsplugues de LlobregatSpain
Hospital Universitario y Politécnico La FeValenciaSpain
Great Ormond Street Hospital for ChildrenLondonUnited Kingdom
The Newcastle upon Tyne Hospitals NHS Foundation TrustNewcastle upon TyneUnited Kingdom

Official Trial Information

View on ClinicalTrials.gov

Data sourced from ClinicalTrials.gov. Last updated: October 12, 2026