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Trial record 1 of 2 for:    metformin | FXS | Canada
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Metformin in Children and Adults With Fragile X Syndrome

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT03722290
Recruitment Status : Completed
First Posted : October 26, 2018
Last Update Posted : February 4, 2021
FRAXA Research Foundation
Information provided by (Responsible Party):
Çaku, Université de Sherbrooke

Brief Summary:
Fragile X Syndrome (FXS) is caused by loss of FMR1 expression on the X chromosome that leads to increased mRNA translation, which results in hyperactivation of ERK (extracellular signal-regulated kinase) and mTORC1 (mechanistic target of rifampicin complex 1) signalling and consequently in synaptic dysfunction and neurological development. There is presently no cure for FXS. Recent studies suggest that metformin (a widely prescribed drug for type II diabetes in children and adults) which crosses the blood-brain barrier, corrects various neurological and behavioral FXS phenotypes by normalizing ERK signaling, EIF4E phosphorylation and lowering expression of MMP9 to normal. Since this drug has not been previously used specifically for treatment of FXS (only few cases reported), the investigators propose an open-label trial of metformin in children and adults with FXS to better understand the safety and efficacy in both behavior and cognition.

Condition or disease Intervention/treatment Phase
Fragile X Syndrome Drug: Metformin Phase 2

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 15 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Intervention Model Description: Open-label trial
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Evaluate the Efficacy and Safety of Metformin in Children and Adults With Fragile X Syndrome: an Open-label Study
Actual Study Start Date : September 1, 2018
Actual Primary Completion Date : October 24, 2019
Actual Study Completion Date : November 1, 2020

Arm Intervention/treatment
Experimental: Metformin
Metformin 500mg twice a day per os for 9 weeks
Drug: Metformin
Oral administration of metformin 250mg (twice a day) for the 1st week followed by metformin 500mg (twice a day) for the next 8 weeks.
Other Name: Glucophage

Primary Outcome Measures :
  1. Incidence of adverses events reported during the study [ Time Frame: 9 weeks ]
    Number and severity of adverse events related to metformin treatment

  2. Change from baseline in the total score of the FX-normed Aberrant Behavior Checklist-Community after 9 weeks of metformin treatment [ Time Frame: Baseline, Week 9 ]
    The ABC-C is a 58-item caregiver-rated behavior scale where each item ranges from 0 (not a problem) to 3 (severe problem).

Secondary Outcome Measures :
  1. Level of cortical excitability using Transcranial Magnetic Stimulation (TMS) [ Time Frame: Baseline, Week 9 ]
    The effects of metformin on cortical excitability will be measured using a magnetic stimulation on the primary motor cortex to assess intracortical facilitation and inhibition

  2. Level of synaptic plasticity using Electroencephalography (EEG) [ Time Frame: Baseline, Week 9 ]
    The effects of metformin on synaptic plasticity will be measured using the changes in amplitude of EEG waves

  3. Changes from baseline in the score of each subscale of the Aberrant Behavior Checklist-Community (ABC-C) [ Time Frame: Baseline, Week 9 ]
    Determining if metformin lowers the score of each subscale of the ABC-C: Irritability (18 items), hyperactivity (10 items), lethargy (16 items), social avoidance (4 items), stereotypy (6 items) and inappropriate speech (4 items). Each item is scored from 0 (not a problem) to 3 (severe problem).

  4. Changes from baseline in the Global Executive Composite (GEC) baseline score of the Behavior Rating Inventory of Executive Function (BRIEF) [ Time Frame: Baseline, Week 9 ]
    The BRIEF is a 86-item questionary evaluating executive functions rated on a 3-point Likert scale: 1 (never), 2 (sometimes) and 3 (often).

  5. Changes from baseline in the score of 4 subtests of the computerized cognitive Test of Attentional Performance for Children [ Time Frame: Baseline, Week 9 ]
    KiTAP is a computerized continuous test of attention assessing the ability to maintain attention in the presence of distractors. The 4 subtests used are Alertness reaction time, Distractibility commission errors, Go/No-Go commission errors and Flexibility errors.

Information from the National Library of Medicine

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Ages Eligible for Study:   10 Years to 45 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Aged between 10 et 45 years old
  • BMI > 18.3
  • Molecular diagnosis of FXS
  • Accompanied by his legal tutor

Exclusion Criteria:

  • Pregnancy/Breastfeeding
  • Intolerance to metformin
  • History of lactic acidosis
  • Gastric/renal/hepatic pathology
  • Acute medical condition
  • Concomitant use of ACE inhibitors
  • Modification of antipsychotic treatments in the last 6 weeks

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03722290

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Canada, Quebec
Université de Sherbrooke
Sherbrooke, Quebec, Canada, J1H 5H3
Sponsors and Collaborators
Université de Sherbrooke
FRAXA Research Foundation
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Responsible Party: Çaku, Principal Investigator, Université de Sherbrooke
ClinicalTrials.gov Identifier: NCT03722290    
Other Study ID Numbers: 2019-2797
First Posted: October 26, 2018    Key Record Dates
Last Update Posted: February 4, 2021
Last Verified: February 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Çaku, Université de Sherbrooke:
Insulin signalisation
Additional relevant MeSH terms:
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Fragile X Syndrome
Pathologic Processes
Mental Retardation, X-Linked
Intellectual Disability
Neurobehavioral Manifestations
Neurologic Manifestations
Nervous System Diseases
Sex Chromosome Disorders
Chromosome Disorders
Congenital Abnormalities
Genetic Diseases, Inborn
Genetic Diseases, X-Linked
Heredodegenerative Disorders, Nervous System
Hypoglycemic Agents
Physiological Effects of Drugs