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Diet Treatment Glucose Transporter Type 1 Deficiency (G1D)

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: NCT03181399
Recruitment Status : Active, not recruiting
First Posted : June 8, 2017
Last Update Posted : May 3, 2023
National Institute of Neurological Disorders and Stroke (NINDS)
Information provided by (Responsible Party):
Juan Pascual, University of Texas Southwestern Medical Center

Tracking Information
First Submitted Date  ICMJE April 25, 2017
First Posted Date  ICMJE June 8, 2017
Last Update Posted Date May 3, 2023
Actual Study Start Date  ICMJE April 18, 2018
Estimated Primary Completion Date September 30, 2023   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: June 6, 2017)
Neuropsychological attention scores [ Time Frame: Medication taken daily for 6 months. ]
To evaluate the impact of triheptanoin supplementation on measures of neuropsychological function primarily indicative of attention in G1D subjects receiving normal diet. These measures include one of two quantitative scales WPPSI-IV (Wechsler Preschool and Primary Scale of Intelligence; if younger than 7 years old), or WASI-II (Wechsler Abbreviated Scale of Intelligence; if older than 8 years old) depending on age.
Original Primary Outcome Measures  ICMJE Same as current
Change History
Current Secondary Outcome Measures  ICMJE
 (submitted: June 6, 2017)
  • EEG changes: spike-wave activity duration in EEG (electroencephalogram) tracings [ Time Frame: Medication taken daily for 6 months. ]
    Expecting to find a greater than 30% decrease in spike-wave activity determined as percent duration of spike-wave activity over the total duration of EEG.
  • Ataxia scores [ Time Frame: Medication taken daily for 6 months. ]
    Ataxia is scored 0 (normal; no ataxia) to 30 (severe ataxia) per modified ICARS ( International Cooperative Ataxia Rating Scale) scale in Schmahmann, J. D., Gardner, R., MacMore, J. and Vangel, M. G. (2009), Development of a brief ataxia rating scale (BARS) based on a modified form of the ICARS. Mov. Disord., 24: 1820-1828
  • Global impression scale [ Time Frame: Medication taken daily for 6 months. ]
    Scores range from 1 (very much improved) through to 7 (very much worse)
Original Secondary Outcome Measures  ICMJE Same as current
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE Diet Treatment Glucose Transporter Type 1 Deficiency (G1D)
Official Title  ICMJE Dietary Treatment of Glucose Transporter Type 1 Deficiency (G1D)
Brief Summary Forty-five subjects receiving no dietary therapy with a proven G1D diagnosis will be enrolled. To evaluate the effect of C7 supplementation of a regular diet on a EEG activity in addition to IQ, language, working memory, processing speed, emotional and behavioral functioning, ataxia, and other neuropsychological and neurological performance indices in children and adults genetically diagnosed with G1D receiving a regular diet at enrollment.
Detailed Description This is an open-label, single arm trial of orally-administered C7 in G1D. Subjects will replace a fixed percentage of their daily caloric intake (based on the results of Protocol 1) with C7 for 6 months, undergo full evaluation and discontinuation of treatment at a 6 month visit, and return for an off-treatment follow up visit 3 months after C7 oil discontinuation, for total duration of participation of 9 months. Subjects will undergo treatment initiation on a 24-hour inpatient basis. During that 24-hr inpatient treatment initiation, subjects will have continuous EEG both to monitor for real-time seizure activity (for safety) and to determine EEG changes (secondary outcome) before, during, and after treatment initiation. Subjects will undergo clinical evaluation, comprehensive blood work, ataxia scale rating, EEG, and neuropsychological testing at baseline, 6 months, and 9 months.
Study Type  ICMJE Interventional
Study Phase  ICMJE Phase 2
Study Design  ICMJE Allocation: N/A
Intervention Model: Single Group Assignment
Intervention Model Description:
All subjects will receive supplementation at the maximum tolerated dose.
Masking: None (Open Label)
Primary Purpose: Treatment
Condition  ICMJE
  • GLUT1DS1
  • Epilepsy
  • Glut1 Deficiency Syndrome 1, Autosomal Recessive
  • Glucose Metabolism Disorders
  • Glucose Transport Defect
  • Glucose Transporter Type 1 Deficiency Syndrome
  • Glucose Transporter Protein Type 1 Deficiency Syndrome
Intervention  ICMJE Drug: Triheptanoin
. Triheptanoin will be taken 4 times per day (approximately every 6 hours: prior to breakfast, lunch and dinner and a mid-afternoon snack) by mouth. It is dosed 4 times per day, divided evenly.
Other Name: C7
Study Arms  ICMJE Experimental: Triheptanoin
This is a single arm study.
Intervention: Drug: Triheptanoin
Publications *

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Active, not recruiting
Estimated Enrollment  ICMJE
 (submitted: June 6, 2017)
Original Estimated Enrollment  ICMJE Same as current
Estimated Study Completion Date  ICMJE September 30, 2023
Estimated Primary Completion Date September 30, 2023   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

Inclusion Criteria:

  • Diagnosis of glucose transporter type I deficiency (G1D), confirmed by clinical genotyping at a CLIA-certified laboratory or by PET scan.
  • Stable diet on either a modified atkins diet or on no dietary therapy (i.e., no dietary therapy for 1 month).
  • Males and females 24 months to 35 years old, inclusive.

Exclusion Criteria:

  • Subjects with evidence of independent, unrelated metabolic and/or genetic disease.
  • Subjects with a chronic gastrointestinal disorder, such as irritable bowel syndrome, Crohn's disease, or colitis that could increase the subject's risk of developing diarrhea or stomach pain.
  • Subjects with a BMI (body mass index) greater than or equal to 30.
  • Subjects currently on dietary therapy (i.e., ketogenic diet, medium chain triglyceride supplemented diets, Atkins diet, low glycemic index diet).
  • Subjects with no evidence of abnormal EEG (spike wave discharges) in the last 12 months.
  • Women who are pregnant or breast-feeding may not participate. Women who plan to become pregnant during the course of the study, or who are unwilling to use birth control to prevent pregnancy (including abstinence) may not participate. Females age 10 and over will be asked to provide a urine sample for a pregnancy test via dipstick. Subjects will be asked to agree to abstinence or another form of birth control for the duration of the study.
  • Allergy/sensitivity to C7.
  • Previous use of triheptanoin in the past 1 month. Subjects who participate in Protocol 1 of this study are thus eligible.
  • Subjects exhibiting signs of dementia, or diagnosed with any degenerative brain disorder (such as Alzheimer's disease) that would confound assessment of cognitive changes, in the opinion of the investigator.
  • Active drug or alcohol use or dependence that, in the opinion of the investigator, would interfere with adherence to study requirements.
  • Inability or unwillingness of subject or legal guardian/representative to give written informed consent, or assent for children age 10-17.
  • Addition of a new antiseizure drug in the previous 3 months.
Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 24 Months to 35 Years   (Child, Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE United States
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT03181399
Other Study ID Numbers  ICMJE 122016-013
1R01NS094257-01A1 ( U.S. NIH Grant/Contract )
Has Data Monitoring Committee Yes
U.S. FDA-regulated Product
Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
IPD Sharing Statement  ICMJE
Plan to Share IPD: No
Current Responsible Party Juan Pascual, University of Texas Southwestern Medical Center
Original Responsible Party University of Texas Southwestern Medical Center
Current Study Sponsor  ICMJE University of Texas Southwestern Medical Center
Original Study Sponsor  ICMJE Same as current
Collaborators  ICMJE National Institute of Neurological Disorders and Stroke (NINDS)
Investigators  ICMJE
Principal Investigator: Juan Pascual, MD Study Principal Investigator
PRS Account University of Texas Southwestern Medical Center
Verification Date April 2023

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP