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This study evaluates NGN-401, a gene therapy, in girls with typical Rett syndrome caused by a disease-causing mutation in the MECP2 gene. Girls with a confirmed diagnosis, in defined age groups and in the post-regression stage of the disease, may take part. The study is in Phase 3 and is currently active but not recruiting new 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: * Females who are between the ages of ≥4 and ≤10 years for Arms 1 and 2 (Arms closed). Females who are ≥11 years of age or older for Arm 3 (Arm closed). Females who are ≥3 for Arm 4, the pivotal cohort. * Diagnosis of typical Rett syndrome with a documented disease-causing mutation in the methyl-CpG-binding protein 2 (MECP2) gene * Current anti-epileptic drug regimen has been stable for at least 12 weeks * Participant must be in the post-regression stage * Participant and caregiver should reside within a 2-hour drive of the study center for at least 3 months following treatment * Participant must have never taken trofinetide or have taken trofinetide and discontinued due to tolerability, lack of efficacy, or other reasons. Following NGN-401 dosing, trofinetide may be initiated after a specified time period and with the support of the treating clinician. Exclusion Criteria: * Normal or near normal hand function * Has a current clinically significant condition other than Rett syndrome * Presence of a concomitant medical condition that precludes intracerebroventricular administration, or use of anesthetics or immune suppression needed for study related procedures Other inclusion and exclusion criteria apply.