A Novel, Regulated Gene Therapy (NGN-401) Study for Females With Rett Syndrome

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The pivotal study, Embolden (TM), is a conversion of the phase 1/2 study and is an open-label, baseline-controlled, multicenter, single-arm study designed to assess the efficacy, safety, and tolerability of administration of NGN401, an adeno-associated viral vector serotype 9 (AAV9) using Neurogene's proprietary transgene regulation technology. NGN-401 contains a full-length human MECP2 gene and is designed to express therapeutic levels of the MeCP2 protein while avoiding overexpression. The study treatment will be given as a single administration under general anesthesia via intracerebroventricular (ICV) delivery. Each participant will be followed for efficacy and safety for 3 years after treatment, and is expected to enroll in a long-term follow-up study for 12 years.