A Phase 1/2/3 Study of UX701 Gene Therapy in Adults With Wilson Disease

Stage 1 (Phase 1/2) is an open-label safety and dose-finding stage designed to evaluate the safety and efficacy of 4 dose levels of UX701 to establish initial safety of UX701 and select a safe and efficacious dose for further evaluation. Stage 2 (Phase 3) is a randomized, open-label, active-controlled stage to evaluate the safety and efficacy of UX701 using the dose selected in Stage 1. Stage 3 is a long-term follow-up stage designed to evaluate the safety, efficacy, and clinical benefit of UX701 for at least 5 years from the time of UX701 administration. Participants who receive UX701 will receive premedication, prophylactic oral corticosteroids and immunomodulation therapy.