A Phase 1, Multicenter, Open-label Study to Investigate the Safety and Biodistribution of a Single Intrathecal Injection of INS1201 in Ambulatory Males With Duchenne Muscular Dystrophy (The ASCEND Study)

Inclusion Criteria * Participant must be male at birth, 3 to \<5 years of age, inclusive (Part 1) and 2 to \<3 years of age (Part 2), at the time of legally authorized representative (LAR) signing and dating the informed consent form. * Ambulatory -as defined as the ability to walk at least 10 meters unassisted (ie, without personal assistance or use of any assistive devices) Note: children who have not yet developed the ability to walk by the time of screening (for whatever reason) will not be eligible for the study. * Has a definitive diagnosis of DMD prior to Screening or as part of Screen…