RecruitingBiological interventionPBGENE-DMD Phase 1/2a Safety and Preliminary Efficacy Study in Duchenne Muscular Dystrophy (FUNCTION-DMD)The purpose of this Phase 1/2a trial is to evaluate the safety, tolerability, and preliminary efficacy of PBGENE-DMD in patients with DMD harboring mutations amenable to excision of exons 45-55. Given the limitations of existing therapeutic strategies, PBGENE-DMD represents a novel, innovative approach with the potential for a one-time, durable correction of the underlying genetic defect in the largest molecular subset of patients with DMD.