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Showing 1–22 of 22 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: MELAS Syndrome Clear all
Recruiting No phase listed Observational Accepts healthy volunteers

Natural History Study - Mitochondrial Disease

NCT01532791
View directory record Official record
Conditions
MELAS or m.3243 A>G Mitochondrial DNA Mutation Carrier
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
4 Years and older
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
No Longer Available No phase listed Expanded access

EPI-743 for Mitochondrial Respiratory Chain Diseases

NCT01370447
View directory record Official record
Conditions
Mitochondrial Diseases
Interventions
EPI-743
Drug
Lead sponsor
PTC Therapeutics
Industry
Eligibility
1 Year and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
16
States / cities
Los Angeles, California • Orange, California • Palo Alto, California + 12 more
Source: ClinicalTrials.gov public record
Updated Jan 22, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 2 Interventional Results available

Study of Idebenone in the Treatment of Mitochondrial Encephalopathy Lactic Acidosis & Stroke-like Episodes

NCT00887562
View directory record Official record
Conditions
MELAS Syndrome
Interventions
Idebenone, Placebo
Drug · Other
Lead sponsor
Michio Hirano
Other
Eligibility
8 Years to 65 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 25, 2016 · Synced Jul 21, 2026, 11:23 AM EDT
Completed No phase listed Observational

Study of the Metabolism of Pyruvate and Related Problems in Patients With Lactic Acidemia

NCT00004353
View directory record Official record
Conditions
Mitochondrial Myopathy, MELAS Syndrome, Lactic Acidosis
Interventions
Not listed
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
Not listed
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 1978
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jul 9, 2008 · Synced Jul 21, 2026, 11:23 AM EDT
Terminated Phase 2Phase 3 Interventional Results available

A Study to Evaluate Efficacy and Safety of Vatiquinone for Treating Mitochondrial Disease in Participants With Refractory Epilepsy

NCT04378075
View directory record Official record
Conditions
Mitochondrial Diseases, Drug Resistant Epilepsy, Leigh Disease, Leigh Syndrome, Mitochondrial Encephalopathy (MELAS), Pontocerebellar Hypoplasia Type 6 (PCH6), Alpers Disease, Alpers Syndrome
Interventions
Vatiquinone, Placebo
Drug · Other
Lead sponsor
PTC Therapeutics
Industry
Eligibility
Up to 20 Years
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
12
States / cities
San Diego, California • Stanford, California • New Haven, Connecticut + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 1Phase 2 Interventional

Promoting Resilience in Stress Management (PRISM) and Clinical-focused Narrative (CFN) Pilot in Adults With Primary Mitochondrial Disease (PMD).

NCT06051448
View directory record Official record
Conditions
Mitochondrial Diseases, Mitochondrial Myopathies, Mitochondrial Encephalomyopathies, MELAS, MERRF
Interventions
Promoting Resilience in Stress Management (PRISM), Clinical-focused narrative (CFN)
Behavioral
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 28, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Recruiting Phase 1 Interventional

Study of N-acetylcysteine in the Treatment of Patients With the m.3243A>G Mutation and Low Brain Glutathione Levels

NCT05241262
View directory record Official record
Conditions
Mitochondrial Disease
Interventions
N-Acetylcysteine
Drug
Lead sponsor
Michio Hirano, MD
Other
Eligibility
18 Years to 80 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 1 Interventional

L-Citrulline Dose Finding Safety Study in MELAS

NCT03952234
View directory record Official record
Conditions
MELAS Syndrome
Interventions
L-Citrulline
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 25, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 2 Interventional

A Phase 2b Study of Zagociguat in Patients With MELAS

NCT06402123
View directory record Official record
Conditions
Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-Like Episodes (MELAS Syndrome)
Interventions
zagociguat 15mg, zagociguat 30mg, Placebo
Drug
Lead sponsor
Tisento Therapeutics
Industry
Eligibility
18 Years to 75 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
10
States / cities
La Jolla, California • Aurora, Colorado • Atlanta, Georgia + 5 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Terminated Phase 2 Interventional Results available

A Long-term Extension of Study RP103-MITO-001 (NCT02023866) to Assess Cysteamine Bitartrate Delayed-release Capsules (RP103) in Children With Inherited Mitochondrial Disease

NCT02473445
View directory record Official record
Conditions
Mitochondrial Diseases
Interventions
Cysteamine Bitartrate
Drug
Lead sponsor
Amgen
Industry
Eligibility
6 Years to 17 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
5
States / cities
San Diego, California • Stanford, California • Akron, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 26, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Not listed Phase 2 Interventional

Evaluating the Effectiveness of a Dichloroacetate in MELAS Syndrome

NCT00068913
View directory record Official record
Conditions
MELAS Syndrome
Interventions
Dichloroacetate
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
6 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2000
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Responses to Influenza Vaccine in Patients With Mitochondrial Disorders (MELAS)

NCT01831934
View directory record Official record
Conditions
MELAS Syndrome
Interventions
Fluzone®
Biological
Lead sponsor
Stanford University
Other
Eligibility
13 Years to 65 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated May 29, 2017 · Synced Jul 21, 2026, 11:23 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

North American Mitochondrial Disease Consortium Patient Registry and Biorepository (NAMDC)

NCT01694940
View directory record Official record
Conditions
Mitochondrial Disorders, Mitochondrial Genetic Disorders, Mitochondrial Diseases, Disorder of Mitochondrial Respiratory Chain Complexes, Deletion and Duplication of Mitochondrial DNA
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
Not listed
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2026
U.S. locations
16
States / cities
San Diego, California • Stanford, California • Aurora, Colorado + 12 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Early Phase 1 Interventional

Ketones & Mitochondrial Heteroplasmy

NCT01252979
View directory record Official record
Conditions
MELAS Syndrome, Mitochondrial Diseases
Interventions
Medium-Chain Triglycerides
Dietary Supplement
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
Not listed
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 5, 2012 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Phase 3 Interventional Results available

A Safety Study for Previously Treated Vatiquinone (PTC743) Participants With Inherited Mitochondrial Disease

NCT05218655
View directory record Official record
Conditions
Inherited Mitochondrial Disease
Interventions
Vatiquinone
Drug
Lead sponsor
PTC Therapeutics
Industry
Eligibility
Not listed
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
14
States / cities
La Jolla, California • Stanford, California • New Haven, Connecticut + 10 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2025 · Synced Jul 21, 2026, 11:23 AM EDT
Completed No phase listed Observational

Mitochondrial Video Assessment Source Material Study

NCT06180421
View directory record Official record
Conditions
PolG, Primary Mitochondrial Myopathy
Interventions
Not listed
Lead sponsor
The Emmes Company, LLC
Industry
Eligibility
16 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Kingston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 13, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Terminated Phase 2 Interventional Results available

Phase 2a Study of IW-6463 in Adults Diagnosed With Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like Episodes (MELAS)

NCT04475549
View directory record Official record
Conditions
MELAS
Interventions
IW-6463 Tablets
Drug
Lead sponsor
Tisento Therapeutics
Industry
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
5
States / cities
Washington D.C., District of Columbia • Baltimore, Maryland • Boston, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2024 · Synced Jul 21, 2026, 11:23 AM EDT
Active, not recruiting Phase 2 Interventional

An Open-label Extension Safety Study of MELAS Patients Who Completed TIS6463-203 (PRIZM)

NCT06961344
View directory record Official record
Conditions
Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-Like Episodes (MELAS Syndrome)
Interventions
zagociguat 15mg
Drug
Lead sponsor
Tisento Therapeutics
Industry
Eligibility
Not listed
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
9
States / cities
La Jolla, California • Aurora, Colorado • Atlanta, Georgia + 5 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Not yet recruiting Phase 1Phase 2 Interventional

A Basket Clinical Study to Assess Glycerol Tributyrate in Patients With Mitochondrial Encephalopathy, Lactic Acidosis, Stroke-like Episodes (MELAS) or Leber's Hereditary Optic Neuropathy-Plus (LHON-Plus)

NCT06792500
View directory record Official record
Conditions
MELAS Syndrome, Lebers Hereditory Optic Neuropathy With Extra Ocular Symptoms (LHON-Plus)
Interventions
Glycerol Tributyrate
Drug
Lead sponsor
George Washington University
Other
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Recruiting Phase 3 Interventional

KHENERFIN Study: A Trial to Evaluate the Efficacy and Safety of Sonlicromanol in Primary Mitochondrial Diseases

NCT06451757
View directory record Official record
Conditions
Mitochondrial Diseases, Maternally Inherited Diabetes and Deafness (MIDD), Mitochondrial Encephalomyopathy, Lactic Acidosis and Stroke-like Episodes (MELAS), Mitochondrial DNA tRNALeu(UUR) m.3243A<G Mutation
Interventions
Sonlicromanol, Placebo
Drug
Lead sponsor
Khondrion BV
Industry
Eligibility
18 Years and older
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
3
States / cities
Boston, Massachusetts • Cleveland, Ohio • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 28, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Enrolling by invitation No phase listed Observational Accepts healthy volunteers

Tissue Sample Study for Mitochondrial Disorders

NCT01803906
View directory record Official record
Conditions
Mitochondrial Disorders, Mitochondrial Disease, Melas, Kearns Sayer, NARP, MNGIE, LHON, Mitochondrial Depletion Syndrome, Leigh's Disease
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
Not listed
Enrollment
6,900 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Jul 21, 2026, 11:23 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Nitric Oxide Production in MELAS Syndrome

NCT01339494
View directory record Official record
Conditions
MELAS Syndrome
Interventions
Arginine and citrulline supplementations
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
3 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2016
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 4, 2016 · Synced Jul 21, 2026, 11:23 AM EDT