Zogenix Resubmits Dravet Syndrome NDA
Zogenix has resubmitted an NDA for Fintepla (fenfluramine hydrochloride) for treating seizures associated with Dravet syndrome. In April, FDA issued a “refusal to file” letter on the original NDA submission because a preliminary review determined that the NDA was not sufficiently complete to permit a substantive review, the company said at the time. In the letter, it said, the agency cited two reasons for its refusal: first, certain non-clinical studies were not submitted to allow assessment of the chronic administration of fenfluramine; and, second, the application contained an incorrect version of a clinical dataset, which prevented the completion of the review process that is necessary to support the NDA. FDA had not requested or recommended additional clinical efficacy or safety studies, Zogenix said.
In announcing the NDA resubmission, the company said it is based on data from two pivotal Phase 3 trials in Dravet syndrome and an interim analysis from an ongoing open-label extension study, which included 232 patients treated for up to 24 months. Zogenix notes that it is also investigating Fintepla in Lennox-Gastaut syndrome, another rare childhood-onset epilepsy, for which a Phase 3 trial is ongoing and top-line data are anticipated in the first quarter of 2020.