Dyne Therapeutics Receives Orphan Drug Designation in Japan for DYNE-251 in Duchenne Muscular Dystrophy

Core Insights - Dyne Therapeutics has received Orphan Drug designation for DYNE-251 in Japan for treating Duchenne muscular dystrophy (DMD) with specific gene mutations, complementing similar designations in the U.S. and Europe [1][2] - The ongoing DELIVER trial has shown sustained functional improvement over 18 months, indicating the potential of DYNE-251 to significantly impact DMD care [1][2] - DYNE-251 is designed to produce near full-length dystrophin, which is crucial for muscle function, and has received multiple designations from regulatory authorities, including Breakthrough Therapy and Fast Track from the FDA [4][2] Company Overview - Dyne Therapeutics focuses on developing therapeutics for genetically driven neuromuscular diseases, including DMD and myotonic dystrophy type 1, with a mission to deliver functional improvement for affected individuals [8] - The company is advancing clinical programs and has preclinical initiatives targeting other exons related to DMD, indicating a broader strategy to address this condition [5][8] Clinical Trial Details - The DELIVER trial is a Phase 1/2 global study evaluating the safety and efficacy of DYNE-251 in DMD patients with mutations amenable to exon 51 skipping, with a registrational dose of 20 mg/kg administered every four weeks [3][4] - The primary endpoint for the registrational expansion cohort is the change in dystrophin protein levels from baseline at 6 months, which is critical for regulatory submission [3]