NCT05693142

AFFINITY DUCHENNE: RGX-202 Gene Therapy in Participants With Duchenne Muscular Dystrophy (DMD)

A Phase 1/2/3 Open-label Study to Evaluate the Safety, Tolerability, Efficacy, Pharmacodynamics, and Pharmacokinetics of Intravenous RGX-202 Gene Therapy in Males With Duchenne Muscular Dystrophy (DMD)

• Status: Recruiting
• Phase: Phase 2 / Phase 3
• Study type: Interventional
• Enrollment: 65 (estimated)
• Sponsor: REGENXBIO Inc. · Industry
• Sex: Male
• Age: 1 Year
• Healthy volunteers: Not accepted

Summary

RGX-202 is a gene therapy designed to deliver a transgene for a novel microdystrophin that includes functional elements of naturally-occurring dystrophin including the C-Terminal (CT) domain. This is a multicenter, open-label dose evaluation clinical study to assess the safety, tolerability, and clinical efficacy of a one-time intravenous (IV) dose of RGX-202 in participants with Duchenne. For additional information on how to participate (or be considered for the study), please follow this link: https://mytomorro.ws/affinity-ct-gov

Detailed description

Duchenne muscular dystrophy (Duchenne) is a rare genetic disorder, caused by mutations in the gene responsible for making dystrophin, a protein of central importance for muscle cell structure and function. The absence of functional dystrophin protein in individuals with Duchenne results in cell damage during muscle contraction leading to cell death, inflammation, and fibrosis in muscle tissues, and ultimately progressive muscle weakness. RGX-202 is designed to use the AAV8 vector to deliver a transgene to muscle cells that encodes a novel microdystrophin that includes the functional elements of naturally occurring dystrophin including the C-Terminal (CT) domain. This is a multicenter, phase I/II/III, open-label study to evaluate the safety, tolerability, pharmacodynamics (microdystrophin protein levels), pharmacokinetic, and clinical efficacy of RGX-202 when administered IV as one-time dose to ambulant male participants with Duchenne. A comprehensive, short-term, prophylactic immunosuppression regimen will be administered during treatment to mitigate a potential immune response. This study is being conducted in three sequential parts: a phase I/II study (Part 1), a phase 3 pivotal study (Part 2) and a confirmatory study (Part 3). Part 1 will study a one-time dose of RGX-202 (1x10\^14 or 2x10\^14 GC/kg) in up to 15 participants with Duchenne. In part 1, the primary objective is to evaluate the safety and tolerability of RGX-202 through 52 weeks. Part 2 (Pivotal Expansion) will study a single dose of RGX-202 (2x10\^14 GC/kg) in approximately 30 participants. After the last Part 2 participant is dosed, enrollment into the confirmatory study (Part 3) will be initiated. The target enrollment for the confirmatory study (Part 3) is approximately 30 participants. Participants will be assessed at various time points for 104 weeks after receiving RGX-202. All participants will be given the opportunity to enroll in a separate long-term follow-study in accordance with the US federal government guidelines for the safety follow-up of patients receiving gene therapy.

Conditions

• Duchenne Muscular Dystrophy

Interventions

Type	Name	Description
GENETIC	RGX-202	RGX-202 is a recombinant AAV8 containing a transgene encoding a novel microdystrophin

Timeline

• Start date: 2023-01-04
• Primary completion: 2026-02-01
• Completion: 2028-08-01
• First posted: 2023-01-20
• Last updated: 2025-12-17

Locations

17 sites across 2 countries: United States, Canada

Regulatory

• FDA-regulated drug study