FDA Greenlights Neurogene’s ‘Best-Case Scenario’ Pivotal Trial Design for Rett Syndrome Gene Therapy
SHERIDAN, WYOMING – July 1, 2025 – Neurogene has reached alignment with the FDA regarding the design of a registrational study for the investigational gene therapy NGN-401 for Rett Syndrome, enabling the company to convert its current Phase I/II study into a pivotal trial—a milestone that analysts describe as the “best-case scenario.”
The FDA has allowed Neurogene to run “a single-arm and baseline-controlled study with female patients aged three years and up,” according to the company’s announcement. NGN-401 will be administered at a single dose, with the trial assessing treatment responders as measured by the Clinical Global Impression-Improvement (CGI-I) scale and the achievement of developmental milestones or skills.
Analysts Call Agreement the ‘Best-Case Scenario’