Beeline: A Phase 3 Study in GRIN-related Neurodevelopmental Disorder (NCT07224581) | Clinical Trial Compass
RecruitingPhase 3
Beeline: A Phase 3 Study in GRIN-related Neurodevelopmental Disorder
United States, Belgium, France100 participantsStarted 2026-01-05
Plain-language summary
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.
Who can participate
Age range
1 Month – 18 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
Part A, Participant:
* Diagnosed with GRIN-NDD with GRIN1, GRIN2A, GRIN2B, or GRIN2D gene variants known to result in GoF of the NMDA receptor
* Phase 3 Cohort 1 (Qualifying Seizures Cohort) ONLY: Experiencing at least 1 CMS per week and ≥4 CMS (generalized or focal) during screening
* With history of inadequate response to at least 2 standard antiseizure medications (ASMs)
* Phase 3 Cohort 2 (Without Qualifying Seizures Auxiliary Cohort) ONLY: With significant neurodevelopmental symptoms and a GRIN-CGI-S score ≥4
* On a stable dose of standard ASMs for at least 4 weeks prior to screening and should remain on stable doses throughout study participation
* On stable nonpharmacological treatments such as ketogenic diet and should remain stable throughout study participation
Part B:
\- Participant has completed Part A and is eligible to continue study participation according to the judgement of the investigator and sponsor.
Exclusion Criteria:
PART A, Participant:
* Has clinically relevant medical, neurologic, or psychiatric condition and/or behavioral disorder (including those related to GRIN-NDD) that would preclude or jeopardize participant's safe participation or study drug administration or the conduct of the study according to the judgement of the investigator or sponsor.
* Is receiving \>4 standard ASMs at screening
* Has a body weight of less than 5 kg at screening
Part B:
\- Participant has clinically relevant medical, neurologic, or psychiat…
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Part A - Phase 3 Cohort 1 (Qualifying Seizures Cohort): Countable motor seizures (CMS)
Timeframe: 12 weeks
2
Part A - Phase 3 Cohort 2 (Without Qualifying Seizures Auxiliary Cohort): Adverse events (AEs), serious adverse events (SAEs), and adverse drug reactions (ADRs)
Timeframe: 24 weeks
3
Part B - Open-Label Extension: Adverse events (AEs), serious adverse events (SAEs), and adverse drug reactions (ADRs)