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GRIN-related DisordersPhase 1NCT05818943

Honeycomb: Evaluation of Radiprodil in Children with GRIN-related Disorder

A Phase 1 study testing Radiprodil in people with GRIN-related Disorders, run by GRIN Therapeutics, Inc. at 15 sites in 8 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

Study RAD-GRIN-101 is a phase 1B trial to assess safety, tolerability, PK, and potential efficacy of radiprodil for the treatment of GRIN-related disorder in children with a Gain-of-Function (GoF) genetic variant. The study is open-label, so all participants will be treated with radiprodil. Read more about this study

Who is it for?
Ages 6 months to 12 years
Conditions the study is for
GRIN-related Disorders
What is being tested?
Radiprodil
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
24 participants
Where
15 sitesin 8 countries
Study dates
7 Mar 2023to Nov 2026
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 6 months to 12 years
  • All sexes
  • No healthy volunteers
  • Child

Who may be able to join

  • Age: ≥6 months to ≤12 years, with GRIN gene variants known to result in GoF of the NMDA receptor.
  • Cohort 1 must have at least 1 observable motor seizure per week and ≥4 observable motor seizures (generalized or focal) during the prospective 4-week Observation Period and must have failed to obtain adequate seizure control with at least 2 antiseizure medications (ASMs) used at appropriate dose and duration.
  • Cohort 2 must have significant behavioral and/or motor symptoms based on caregiver report with a CGI-S score ≥4.
  • Stable antiseizure therapies and nonpharmacological treatments such as ketogenic diet throughout screening and study participation.

Who cannot join

  • Any other clinically relevant medical, neurologic, or psychiatric condition and/or behavioral disorder unrelated to GRIN-related disorder that would preclude or jeopardize participant's safe participation or the conduct of the study according to the judgement of the investigator.
  • Clinically significant laboratory or ECG abnormalities.
  • Severe hepatic dysfunction (Child-Pugh grade C).
  • History of brain surgery for epilepsy or any other reason.
  • Receiving treatment with contraindicated concomitant drugs such as agonists or antagonists of the glutamate receptor, including but not limited to felbamate, memantine, and perampanel.
  • Receiving treatment with hormonal therapy such as adrenocorticotrophic hormone or prednisolone.

Trial locations and contacts

15 sites in 8 countries.

15 sites in 8 countries

United States2 sites
  • Mid-Atlantic Epilepsy and Sleep Center

    Bethesda, Maryland, 20817

  • Columbia University Irving Medical Center, Dept of Neurology

    New York, New York, 10032

Other trials in United States

Canada2 sites
  • The Hospital for Sick Children (Sick Kids)

    Toronto, Ontario, M5G 1X8

  • BC Children's Hospital

    Vancouver, BC V6H 3N1

Other trials in Canada

Germany2 sites
  • Abteilung für Neuropädiatrie, Klinik und Poliklinik für Kinder - und Jugendmedizin, Universitätsklinikum Leipzig

    Leipzig, 04103

  • KBO-Kinderzentrum München gemeinnützige GmbH

    München, 81377

Other trials in Germany

Italy2 sites
  • Azienda Ospedaliero Universitaria Careggi (AOUC) Firenze - Azienda Ospedaliera Universitaria Meyer

    Florence, Tuscany, 50139

  • Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) - Ospedale Pediatrico Bambino Gesu

    Rome, Lazio, 00165

Other trials in Italy

Netherlands2 sites
  • ERASMUS Medisch Centrum, Developmental & Genetic pediatrics

    Rotterdam, 3015

  • UMC Utrecht - Wilhelmina Kinderziekenhuis, Polikliniek Kinderneurologie

    Utrecht, 3508

Other trials in Netherlands

Spain2 sites
  • Universitat de Barcelona - Hospital Sant Joan de Deu Barcelona (HSJDB)

    Barcelona, 08950

  • Hospital Ruber Internacional

    Madrid, 28034

Other trials in Spain

United Kingdom2 sites
  • Royal Hospital for Children Glasgow

    Glasgow, G51 4TF

  • Great Ormond Street Hospital For Children NHS Foundation Trust

    London, WC1N 3JH

Other trials in United Kingdom

Australia1 site
  • Queensland Children's Hospital

    South Brisbane, Queensland, 4101

Other trials in Australia

About this study

Official title: A Multicenter Study to Assess the Safety, Tolerability, Pharmacokinetics, and Effect on Seizures and Behavioral Symptoms of Multiple Individually Titrated Doses of Radiprodil in Children with GRIN-related Disorder

Study RAD-GRIN-101 is a phase 1B trial to assess safety, tolerability, PK, and potential efficacy of radiprodil for the treatment of GRIN-related disorder in children with a Gain-of-Function (GoF) genetic variant. The study is open-label, so all participants will be treated with radiprodil.

Subjects' participation in the study is expected to last up to six months in Part A.

After the end of part A, all participants who are still eligible can choose to continue to receive radiprodil as part of an open-label long-term treatment period (Part B).

Read the detailed description

The effect of radiprodil is assessed in two (2) cohorts of pediatric participants: one (1) cohort of participants with treatment-resistant seizures (with or without behavioral symptoms) (Cohort 1) and one (1) cohort of participants with behavioral symptoms but no qualifying seizures (Cohort 2) caused by Gain-of-Function (GoF) variants in the GRIN gene. As the daily doses of radiprodil will be individually titrated for every participant and all the participants will receive the study drug, this is in effect a "single group" study.

This study is divided into the following periods:

PART A:

  • Screening/Observation Period (35 days): Investigators assess eligibility followed by a four(4)- week Observation Period to evaluate seizure frequency and/or behavioral symptoms.
  • Titration Period (approx. 51 days): Overnight stay to administer radiprodil twice daily to assigned dose level, assessing plasma concentrations, safety, and tolerability during the titration period. Once a safe and potentially effective dose has been established, the participant will immediately enter the Maintenance Period.
  • Maintenance Period (up to 53 days): During the Maintenance Period, the participant will continue to take the highest safe and potentially effective dose, as identified during the Titration Period. At the end of the Maintenance Period, there will be an additional overnight stay when the participant will either be invited to take part in Part B or enter the Tapering and Safety Follow-up Period.
  • Tapering (15 days) and Safety Follow-up Period (14 days): the participant who doesn't take part in the long-term treatment period (Part B) will need to taper off (ie gradually decrease) the study medicine for 15 days and enter a safety Follow-up Period (14 days). In this case, the participant will make one (1) last visit to the study site 14 days after his/her last dose of radiprodil.

PART B:

  • Long-Term Treatment Period (not specified): Participation in Part B of the study, at the dose established during part A, will be continued until such time as either the participant withdraws/is withdrawn from the study or sponsor terminates the study. During this period there will be four (4) visits per year, two(2) of which will require overnight stays. At the end of the Long-Term Treatment Period, the participant will enter the Tapering and Safety Follow-up Period.
  • Tapering (15 days) and Safety Follow-up Period (14 days): the participant will need to taper off the study medicine for 15 days and enter a safety Follow-up Period of 14 days. In this case, the participant will make one (1) last visit to the study site 14 days after his/her last dose of radiprodil.
Being tested
Radiprodil
Keywords
GRIN1, GRIN2A, GRIN2B, GRIN2D

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • RadiprodilDrug

    Radiprodil is an orally active, negative allosteric modulator of the NR2B subunit of the NMDA receptor.

Study groups in NCT05818943
Study groupRoleWhat they receive
RadiprodilExperimentalLiquid suspension of radiprodil, at concentrations 0.25 mg/mL or 2.50 mg/mL for 1% and 10% formulation respectively. It will be administered twice a day (bid) either orally or via gastric or nasogastric tube, slowly up-titrated to the highest tolerated dose.
Receives: Drug: Radiprodil

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Incidence of Treatment-Emergent Adverse Events (TEAEs), Serious TEAEs (SAEs), TEAEs Leading to Discontinuation and Severity of TEAEs

    Frequency, type, severity and duration of adverse events, serious adverse events and adverse drug reactions.

    Measured: through study completion (average of 2 years).

  2. Maximum Plasma concentration of radiprodil (Cmax)

    Measured: Titration Visit 1 (week 5): 0,1,2,4,6,8,10,12 hours post-dose. Titration Visits 2,3,4 (week 6 to 11) and Maintenance Visit 4 (week 20): 0,1,2,5 hours post-dose.

  3. Pharmacokinetic plasma concentration of radiprodil: half-life (T1/2)

    Measured: Titration Visit 1 (week 5): 0,1,2,4,6,8,10,12 hours post-dose. Titration Visits 2,3,4 (week 6 to 11) and Maintenance Visit 4 (week 20): 0,1,2,5 hours post-dose.

  4. Plasma concentration of radiprodil versus time, area under the curve (AUCt)

    Measured: Titration Visit 1 (week 5): 0,1,2,4,6,8,10,12 hours post-dose. Titration Visits 2,3,4 (week 6 to 11) and Maintenance Visit 4 (week 20): 0,1,2,5 hours post-dose.

  5. Pharmacokinetic plasma concentration of radiprodil, clearance (Cl)

    Measured: Titration Visit 1 (week 5): 0,1,2,4,6,8,10,12 hours post-dose. Titration Visits 2,3,4 (week 6 to 11) and Maintenance Visit 4 (week 20): 0,1,2,5 hours post-dose.

  6. Pharmacokinetic plasma concentration of radiprodil, Time corresponding to occurrence of Cmax (Tmax)

    Measured: Titration Visit 1 (week 5): 0,1,2,4,6,8,10,12 hours post-dose. Titration Visits 2,3,4 (week 6 to 11) and Maintenance Visit 4 (week 20): 0,1,2,5 hours post-dose.

Secondary outcomes (10)
  1. Percent change from baseline in V-EEG seizure burden

    Assessed by 8- to 24- hour video electroencephalogram

    Measured: Baseline (week 5) to study completion (average of 2 years).

  2. Change from baseline in seizure frequency

    Assessed by seizure diaries

    Measured: Baseline (week 5) to study completion (average of 2 years).

  3. Aberrant Behavior Checklist-Community (ABC-C)

    The ABCC is a standardized 58-item caregiver-reported problem-behavior rating scale, originally designed to assess treatment effects in people with intellectual disabilities. Each item is scored from 0 (never a problem) to 3 (severe problem). Items load onto one of five empirically derived subscales: Irritability, Agitation, \& Crying (15 items); Lethargy/Social Withdrawal (16 items); Stereotypic Behavior (7 items); Hyperactivity/Noncompliance (16 items); and Inappropriate Speech (4 items). A total score would range from 0 to 174.

    Measured: Baseline (week 5) to study completion (average of 2 years).

  4. Caregiver Global Impression of Change (CaGI-C)

    The CaGI-C is a 7-point caregiver-rated scale ranging from 1 (very much improved) to 7 (very much worse).

    Measured: Baseline (week 5) to study completion (average of 2 years).

  5. Change from Baseline in Clinical Global Impression - Severity [CGI-S]

    The CGI-S scale is a clinician-rated measures of severity of a symptom or condition, using a single item, 6- or 7-point scale. The CGI-S scale ranges from 1 ("None") to 6 ("Very Severe").

    Measured: Baseline (week 5) to study completion (average of 2 years).

  6. Clinical Global Impression of Change [CGI-C]

    The CGI scale is a clinician-rated measures of change of a symptom or condition, using a single item, 6- or 7-point scale. The CGI-C scale ranges from 1 ("Very much worse") to 7 ("Very much improved").

    Measured: Baseline (week 5) to study completion (average of 2 years).

  7. Gross Motor Function Measure (GMFM)

    The GMFM is a standardized observational instrument designed and validated to measure change in gross motor function over time in children with cerebral palsy. There is a 4-point (0 to 3) scoring system for each of the 5 dimensions of gross motor function, with higher scores denoting better performance.

    Measured: Baseline (week 5) to study completion (average of 2 years).

  8. Sleep Disturbance Scale for Children (SDSC)

    The SDSC is a parent-report measure to screen for sleep disturbances within the preceding period. It is a 27-item questionnaire rated on a 5-point Likert scale, with higher scores being indicative of more acute sleep disturbances.

    Measured: Baseline (week 5) to study completion (average of 2 years).

  9. Pediatric Quality of Life Inventory [PedsQL]

    The PedsQL is a 23-item generic health status instrument assessing 5 domains of health in children. It's a 0-100 scale, and higher scores are indicative of better health-related quality of life.

    Measured: Baseline (week 5) to study completion (average of 2 years).

  10. Caregiver Burden Inventory (CBI)

    The CBI is a validated scale providing information regarding the impact of caregiving on the lives of caregivers. It comprises 24 closed questions divided into 5 dimensions. Each dimension includes 4 or 5 items. Each item is given a score between 0 and 4, where higher scores indicate greater caregiver burden.

    Measured: Baseline (week 5) to study completion (average of 2 years).

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted19 Apr 2023
  2. Study start7 Mar 2023
  3. Primary completionNov 2026 (estimated)
  4. Study completionNov 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
24 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05818943
Sponsor's protocol ID
RAD-GRIN-101
Other IDs
2022-000317-14
Status last verified
Nov 2024
First submitted
22 Feb 2023
Last updated
15 Nov 2024
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Undecided

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Radiprodil in people with GRIN-related Disorders, run by GRIN Therapeutics, Inc. at 15 sites in 8 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 15 Nov 2024. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 15 sites in United States, Canada, Germany, Italy, Netherlands and 3 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Incidence of Treatment-Emergent Adverse Events (TEAEs), Serious TEAEs (SAEs), TEAEs Leading to Discontinuation and Severity of TEAEs (time frame: through study completion (average of 2 years).). The study lists 6 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Nov 2024.

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