Beeline: A Phase 3 Study in GRIN-related Neurodevelopmental Disorder

The Phase 3 portion of Study RAD-GRIN-101 is a multinational, multicenter, randomized, double-blind, placebo-controlled trial followed by an open-label extension to evaluate the efficacy and safety of radiprodil in participants with GRIN-related neurodevelopmental disorder (GRIN-NDD) with a gain-of-function (GoF) genetic variant. This study will enroll two cohorts: one cohort of participants with a minimal number of countable motor seizures (with or without behavioral symptoms) (Phase 3 Cohort 1: Qualifying Seizures Cohort); and a second cohort with disease symptoms but no seizures or fewer seizures than required for the Qualifying Seizures Cohort (Phase 3 Cohort 2: Without Qualifying Seizures Auxiliary Cohort). Participants in each cohort will be randomized 1:1 to receive active drug (radiprodil) or matching placebo (Part A). Following completion of Part A, all eligible participants (including those previously on placebo) may continue into the open-label extension period (Part B) to receive radiprodil. The placebo-controlled portion is expected to be approximately 16 weeks for participants in Phase 3 Cohort 1 and 28 weeks for participants in Phase 3 Cohort 2. The study will evaluate the effect of radiprodil on seizures and non-seizure symptoms and assess safety.

NCT Number	NCT07224581
Lead Sponsor	GRIN Therapeutics, Inc. Collaborators: Aziende Chimiche Riunite Angelini Francesco S.p.A
Conditions	GRIN-related Neurodevelopmental Disorder
Enrollment	100 participants
Start Date	2026-01-05
Primary Completion	2027-05 (estimated)
Study Completion	2028-07 (estimated)
Updated on ClinicalTrials.gov	2026-07-17