Treatment Development of Triheptanoin (G1D)

Treatment Development of Triheptanoin (C7) for Glucose Transporter Type I Deficiency (G1D): A Phase I Maximum Tolerable Dose Trial

To determine the maximum tolerated dose (MTD), as a percentage of calories consumed, of triheptanoin (C7 oil; C7) in a pediatric and adult patient population genetically diagnosed with glucose transporter type 1 deficiency disorder (G1D).

Study Overview

• Status: Completed
• Conditions: Glucose Metabolism Disorders; Epilepsy; Glucose Transporter Type 1 Deficiency Syndrome; Glut1 Deficiency Syndrome 1, Autosomal Recessive; Glucose Transporter Protein Type 1 Deficiency Syndrome; Glucose Transport Defect; GLUT1DS1
• Intervention / Treatment: Drug: Triheptanoin

Detailed Description

The trial will use an open-label, standard 3+3 phase I design for determining the MTD of orally-administered C7 in G1D.

Triheptanoin: a triglyceride oil containing three odd-carbon chain-length fatty acids (i.e., a triglyceride of 7-carbon heptanoic acid). Triheptanoin will be taken 4 times per day (approximately every 6 hours) by mouth. it is dosed 4 times per day, divided evenly, and the total C7 daily dose will re-place 40% or 45% (depending on group) of the daily caloric intake from fat in the usual diet, based on current protocol guidelines. The oil should be taken approximately one hour before meals, and will be mixed with fat-free, sugar-free yogurt or pudding for administration.

Up to thirty-six subjects will be enrolled in a 10-day maximum tolerable dose trial of C7. Initiation of C7 dosing will be conducted in the Children's Medical Center Dallas ambulatory Care Pavilion neurology Clinic. Subjects will be provided with C7 oil to take over the 7 days of administration.

Subjects will not be required to stop other medications. Subjects will be directed to maintain their usual medications, including rescue seizure medications, as necessary for the course of the study. Subjects may have any clinical medical records transferred back to their referring physician at completion of the study.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Texas
    • Dallas, Texas, United States, 75390
      • UT Southwestern Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 2 years to 35 years (Child, Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Diagnosis of glucose transporter type I deficiency (G1D) confirmed by genotyping or PET scan of the brain.
• Stable on no dietary therapy other than Modified Atkins diet (i.e., on no dietary therapy for 1 month, including, but not limited to, medium chain triglyceride therapy).
• Males and females 2 years 6 months to 35 years 11 months old, inclusive.

Exclusion Criteria:

• Subjects with a history of life-threatening seizure episodes, including but not limited to status epilepticus and cardiac arrest.
• Subjects with evidence of independent, unrelated metabolic and/or genetic disease.
• Subjects with a body mass index (BMI) greater than or equal to 30.
• Subjects with a chronic gastrointestinal disorder, such as irritable bowel syndrome, Crohn's disease, or colitis, which could increase the subject's risk of developing diarrhea or stomach pain.
• Subjects currently on dietary therapy (i.e., ketogenic diet, medium chain triglyceride-supplemented diets, Atkins diet, low glycemic index diet, and related diets).
• 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 treatment with C7 one month prior to enrollment.
• Treatment with medium chain triglycerides in the last 30 days.
• 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 1 parent or legal guardian/representative to give written informed consent.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Triheptanoin; Dose 1 C7 administered as 40% daily caloric intake. Dose 2. C7 administered as 45% daily caloric intake.	Drug: Triheptanoin; Triheptanoin will be administered for 7 days 4 times daily.; Other Names: C7

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Maximum tolerated dose trial	To determine the MTD as a percentage of calories consumed in pediatric and adult patient population.	medication taken daily for 7 days.

Collaborators and Investigators

• Sponsor: Juan Pascual
• Collaborators: National Institute of Neurological Disorders and Stroke (NINDS)
• Investigators: Principal Investigator: Juan Pascual, UT Southwestern Medical Center

Publications and helpful links

General Publications

• Marin-Valencia I, Good LB, Ma Q, Malloy CR, Pascual JM. Heptanoate as a neural fuel: energetic and neurotransmitter precursors in normal and glucose transporter I-deficient (G1D) brain. J Cereb Blood Flow Metab. 2013 Feb;33(2):175-82. doi: 10.1038/jcbfm.2012.151. Epub 2012 Oct 17.
• Pascual JM, Liu P, Mao D, Kelly DI, Hernandez A, Sheng M, Good LB, Ma Q, Marin-Valencia I, Zhang X, Park JY, Hynan LS, Stavinoha P, Roe CR, Lu H. Triheptanoin for glucose transporter type I deficiency (G1D): modulation of human ictogenesis, cerebral metabolic rate, and cognitive indices by a food supplement. JAMA Neurol. 2014 Oct;71(10):1255-65. doi: 10.1001/jamaneurol.2014.1584.
• Pascual JM, Ronen GM. Glucose Transporter Type I Deficiency (G1D) at 25 (1990-2015): Presumptions, Facts, and the Lives of Persons With This Rare Disease. Pediatr Neurol. 2015 Nov;53(5):379-93. doi: 10.1016/j.pediatrneurol.2015.08.001. Epub 2015 Aug 10.

Helpful Links

• Rare Brain Disorders Program at UT Southwestern

Study record dates

Study Major Dates

• Study Start (Actual): March 29, 2017
• Primary Completion (Actual): December 22, 2017
• Study Completion (Actual): December 22, 2017

Study Registration Dates

• First Submitted: January 31, 2017
• First Submitted That Met QC Criteria: February 1, 2017
• First Posted (Estimate): February 2, 2017

Study Record Updates

• Last Update Posted (Actual): December 22, 2022
• Last Update Submitted That Met QC Criteria: December 20, 2022
• Last Verified: December 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Disease; Syndrome; Metabolic Diseases; Glucose Metabolism Disorders
• Other Study ID Numbers: STU 062016-105; R01NS094257 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No