ENDEAVOR Study of ETX101 Gene Therapy for Infants and Children With SCN1A-Positive Dravet Syndrome from 6 months to 17 years

What this Trial Is About

Researchers are investigating ETX101, a gene therapy delivered via an adeno-associated viral vector, in infants and children diagnosed with SCN1A-positive Dravet syndrome. The study includes multiple age groups ranging from 6 months to under 18 years and aims to assess the safety and effects of ETX101. It is designed as a Phase 12, multicenter trial with different parts evaluating dose levels and treatment impact using a randomized, controlled approach in later stages. The study is divided into parts Part 1A uses an open-label, dose-escalation design to test up to four doses of ETX101 in participants aged 6 to under 36 months. Part 1B is open-label and tests a single dose in participants aged 48 months to under 18 years. Part 2 is a double-blind, randomized, sham delayed-treatment control study involving participants aged 6 to under 48 months, where participants receive either ETX101 or a sham procedure with delayed treatment. This part includes two cohorts and lasts up to 52 weeks. Participants will be closely monitored through the study with assessments of seizure frequency, cognitive and adaptive behavior changes using tools like the Bayley-4 and Vineland-3 scales, and clinical global impressions over 52 weeks. Safety and effectiveness are evaluated by comparing seizure counts before and after dosing. The study includes various cognitive and behavioral outcome measures and follows participants from dosing up to one year for treatment effects and safety observations.

A Clinical Study to Evaluate the Safety and Efficacy of ETX101 in Infants and Children With SCN1A-Positive Dravet Syndrome