Dyne Therapeutics Announces FDA Breakthrough Therapy Designation for DYNE-251 in Duchenne Muscular Dystrophy (DMD)

Core Insights - Dyne Therapeutics has received Breakthrough Therapy Designation from the FDA for DYNE-251, aimed at treating Duchenne muscular dystrophy (DMD) through exon 51 skipping, with data from the DELIVER trial expected in late 2025 and a potential BLA submission anticipated in early 2026 [1][2][6] Company Overview - Dyne Therapeutics is focused on developing therapies for genetically driven neuromuscular diseases, including DMD and myotonic dystrophy type 1 (DM1) [9] - The company is advancing clinical programs targeting muscle and the central nervous system to address the root causes of these diseases [9] Product Details - DYNE-251 is an investigational therapeutic designed to produce near full-length dystrophin in muscle and the central nervous system, which is crucial for functional improvement in DMD patients [5][8] - The DELIVER trial is a global, randomized, placebo-controlled, double-blind Phase 1/2 clinical trial assessing the safety, tolerability, and efficacy of DYNE-251 in DMD patients with specific mutations [4][5] Clinical Trial Information - The DELIVER trial has completed enrollment of 32 patients in the Registrational Expansion Cohort, with the primary endpoint being the change in dystrophin protein levels at 6 months [6][4] - The trial's multiple ascending dose portion identified a registrational dose of 20 mg/kg of DYNE-251 administered every four weeks [4] Regulatory Designations - DYNE-251 has received multiple designations from the FDA, including Fast Track, Orphan Drug, and Rare Pediatric Disease designations, which facilitate expedited development and review processes [6][7] - The Breakthrough Therapy Designation allows for enhanced FDA support, including senior-level involvement and early communication regarding trial design and regulatory strategy [6][2] Disease Context - Duchenne muscular dystrophy (DMD) is a rare, progressive neuromuscular disorder primarily affecting males, with approximately 12,000 individuals in the U.S. and 16,000 in the EU affected [8] - There is a significant unmet need for new treatment options that can deliver functional improvements for DMD patients [8]