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This study evaluates the safety and preliminary efficacy of TSHA-102, a gene therapy, in young girls with Rett syndrome. Girls aged 2 to under 4 years with classic Rett syndrome and a confirmed loss-of-function mutation in the MECP2 gene may take part. The study is in Phase 3 and is currently recruiting participants.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * Pediatric females between the ages of 2 and less than 4 years old. * Participant has a clinical diagnosis of classic/typical Rett syndrome with a documented pathogenic mutation of the methyl-CpG-binding protein 2 (MECP2) gene that results in loss of gene function. * Participants must be willing to receive blood or blood products for the treatment of an AE if medically needed. * Participants and parent/caregiver must agree to reside within easy access to the study site prior to the baseline visit and at least 3 months after TSHA-102 treatment. Exclusion Criteria: * Participant has another neurodevelopmental disorder independent of the MECP2 loss-of-function mutation, or any other genetic syndrome with a progressive course. * Participant has a history of brain injury that causes neurological problems or had grossly abnormal psychomotor development in the first 6 months of life. * Participant has a diagnosis of atypical Rett syndrome or a MECP2 gene mutation that does not cause Rett syndrome. * Participant requires invasive ventilatory support. Note: Other protocol defined inclusion/exclusion criteria may apply