Triheptanoin in Mc Ardle

NCT ID: NCT02919631

Last Updated: 2025-09-04

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 12 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2016-11-16
• Study Completion Date: 2017-06-26

Brief Summary

Background: Patients with the sugar metabolism disorder, Glycogen Storage Disease Type V, have insufficient breakdown of sugar stored as, glycogen, within the cells. The investigators know from previous studies with McArdle patients, that they not only have a reduced sugar metabolism, both also have problems in increasing their fat metabolism during exercise to fully compensate for the energy deficiency.

Studies on Triheptanoin diet used in patients with other metabolic diseases have shown that Triheptanoin can increase metabolism of both fat and sugar. In these patients, Triheptanoin has had a positive effect on the physical performance and has reduces the level of symptoms experienced by patients.

Aim: To investigate the effect of treatment with the dietary oil, Triheptanoin, in patients with McArdle disease on exercise capacity.

Methods: 20-30 adult patients will be recruited through Rigshospitalet in Copenhagen, Denmark and Hopital Pitié-Sapêtrière in Paris, France.

1. Pre-experimental testing (1 day): Baseline blood samples are collected to obtain baseline values of safety parameters: Plasma-acylcarnitines, free fatty acids and creatine kinase. Subjects perform a max-test to determine their VO2max

2. Treatment period #1 (2 weeks): Subjects follow a diet consuming a dietary treatment oil. Neither patients nor members of the study group know who receive which type of oil.

3. Washout period (1 week +7 days): Subjects receive no treatment

4. Treatment period #2 (2 weeks +7days): Subjects who received Triheptanoin oil in the first treatment period, now receive placebo oil and vice versa.

Assessments: Before and after each treatment periods, subjects perform a 30-minutes exercise test on a cycle ergometer, comprising of 20-22 minutes of constant load exercise and 6-8 minutes increasing load to peak. Subjects will complete a Fatigue Severity Scale questionnaire and metabolic products will be measured in blood and urine.

Detailed Description

This project will investigate the treatment potential of the drug Triheptanoin in patients with the inborn defect in glycogen metabolism, McArdle Disease. There is currently no treatment available for this group of patients. The condition leads to intolerance to physical exercise with a risk of developing severe cramps and contractures followed by muscle damage and acute kidney failure. Also one third of the patients develop progressive muscle weakness and wasting.

The McArdle patients have an inherited defect in the enzyme, myofosforylase, an important link in the glycogenolysis within skeletal muscle. As a consequence, the patients lack substrates for glycolysis to fuel muscle work (1). The investigators have previously shown that patients with McArdle disease are unable to increase fat metabolism enough to compensate for the energy insufficiency that occurs in these patients in response to exercise (2).

A key limitation to exercise in McArdle disease is the reduced production of pyruvate, causing depletion of intermediates in the Citric Acid Cycle (CAC). Triheptanoin is a triglyceride of glycerol and three 7-carbon fatty acid chains (heptanoate). The breakdown of odd-number carbon fatty acids, such as heptanoate, generates CAC-intermediates. Triheptanoin can therefore potentially boost the flux through the CAC and increase the ATP and energy generation in the cells.

In other patients with inborn errors of metabolism, treatment with daily Triheptanoin supplement can increase metabolism of both fat and glucose. Triheptanoin treatment has reduced the symptom frequency and increased exercise tolerance and physical performance in these patients (3,4).

The aim of this study is to investigate the effect of Triheptanoin on exercise performance and tolerance and frequency of symptoms in patients with McArdle disease.

METHODS

The study will be designed as a double blinded placebo controlled cross-over study. During a 5 week trial period each study patient will go through a 2 week treatment period, a 1 week (+7days) wash-out period without treatment followed by another 2 week treatment period. In one treatment period, the patient takes a daily dietary oil supplement containing Triheptanoin and in the other period (2 weeks +7days), the oil contains regular safflower oil (placebo). Both Triheptanoin and placebo oil is manufactured, packed and handed out by the manufacturer, Ultragenyx Pharmaceuticals Inc. in a way that neither patients, nor the investigators will know in which period, which treatment is given to which patient.

Assessments:

The patients will meet at the laboratory for assessments on 5 occasions:

Screening visit: Patients perform a peak exercise test on a cycle ergometer wearing a mask that can measure oxygen and carbon dioxide exchange rates. Patients exercise with increasing workload until exhaustion to find their maximal oxidative capacity and maximal workload Test days 1-4: On one test day before and one after each treatment period, the patients perform a 30-minutes exercise test on a cycle ergometer working at a constant moderate intensity for 20-22 minutes followed by a 6-8 minutes stepwise increase to peak workload. Blood samples will be taken before, during and after exercise to measure concentrations of metabolic products. Patients report their current feeling of fatigue in a Fatigue Severity Scale (FSS-questionnaire)

Subjects:

A total number of 21-26 patients will be included in the study across three trial sites. From the French cohort of McArdle Patients; 10-15 patients will be included and from the Danish cohort; 11 patients have been already included.

Conditions

Glycogen Storage Disease Type V

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

triheptanoin

14 days on Triheptanoin treatment including a 7 days titration period and a 7 days full dose treatment of 1mL/kg/day.

Group Type: ACTIVE_COMPARATOR

Triheptanoin

Intervention Type: DRUG

Anaplerotic dietary oil

placebo oil

14 days of diet on a placebo oil including 7 days titration period and 7 days full dose treatment of 1mL/kg/day

Group Type: PLACEBO_COMPARATOR

Placebo oil

Intervention Type: DRUG

Safflower oil

Interventions

Triheptanoin

Anaplerotic dietary oil

Intervention Type: DRUG

Placebo oil

Safflower oil

Intervention Type: DRUG

Other Intervention Names

UX007; UX007 Placebo Oral Liquid

Eligibility Criteria

Inclusion Criteria

• Male or female between 18 and 65 years of age,
• Genetically and/or biochemically verified diagnosis of McArdle disease
• Body Mass Index of 18-32
• Women in child-bearing age on contraceptive treatment with: Birth control pills, coil, ring, transdermal hormone patch injection of gestagen or subdermal implant.
• French national health insurance
• Signed informed consent
• Available for phone calls

Exclusion Criteria

• Minor
• Significant cardiac or pulmonary disease
• Pregnancy (confirmed by urinary-HCG) or breastfeeding. Pregnancy not planned and to be avoided during the study by use of effective contraceptive methods.
• Persons deprived of their liberty by judicial or administrative decision
• Adult subject under legal protection or unable to consent
• Treatment with beta-blockers
• Inability to perform cycling exercise
• Any other significant disorder that may confound the interpretation of the findings
• Person subject to an exclusion period for a previous clinical trial

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Rigshospitalet, Denmark

OTHER

Sponsor Role: collaborator

Institut National de la Santé Et de la Recherche Médicale, France

OTHER_GOV

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Pitié-Salpêtrière,centre de référence de pathologie neuromusculaire, 47 Bd de l'hôpital

Paris, , France

Countries

France

References

Madsen KL, Laforet P, Buch AE, Stemmerik MG, Ottolenghi C, Hatem SN, Raaschou-Pedersen DT, Poulsen NS, Atencio M, Luton MP, Ceccaldi A, Haller RG, Quinlivan R, Mochel F, Vissing J. No effect of triheptanoin on exercise performance in McArdle disease. Ann Clin Transl Neurol. 2019 Oct;6(10):1949-1960. doi: 10.1002/acn3.50863. Epub 2019 Sep 14.

Reference Type: BACKGROUND

PMID: 31520525 (View on PubMed)

Other Identifiers

C15-54

Identifier Type: -

Identifier Source: org_study_id