Monocarboxylate Transporter 8 DeficiencyNCT05911399
Expanded Access Program for Tiratricol in Patients With Monocarboxylate Transporter 8 Deficiency
A study testing Tiratricol in people with Monocarboxylate Transporter 8 Deficiency and Allan-Herndon-Dudley Syndrome, run by Rare Thyroid Therapeutics International AB at 17 sites in United States.
Trial summary
The goal of this program is to provide expanded access (i.e., before marketing authorization) to tiratricol as treatment for patients with monocarboxylate transporter 8 deficiency (MCT8 deficiency, also known as Allan-Herndon-Dudley syndrome [AHDS]), who in their Treating Physician's opinion, could benefit from… Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Monocarboxylate Transporter 8 Deficiency, Allan-Herndon-Dudley Syndrome
- What is being tested?
- Tiratricol
- Type of treatment
- Pill or oral medicine
- How many people
- Not given
- Where
- 17 sitesUnited States
- Study dates
- Start not givento not given
- Phase
- Expanded access
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Any age
- All sexes
- Child, Adult, Older adult
Who may be able to join
- Each patient must meet all of the following criteria to be eligible:
- Diagnosis of MCT8 deficiency confirmed with a genetic test.
- Either tiratricol treatment naïve, or patients who may be on a stable dose of tiratricol having transferred from the Phase 3 MCT8-2021-3 (ReTRIACt) study (NCT05579327) or prior individual investigational new drug (IND).
- In the Treating Physician's medical opinion, the potential benefits of treatment with tiratricol outweigh the potential risks for the patient.
- Patient or legal representative provided signed and dated informed consent to be treated with tiratricol, through this EAP.
- Given the severity of the disease, sexual activity in these patients is deemed unlikely. However, where, at the discretion of the Treating Physician sexual activity is possible for the patient, patients must follow protocol-specified-contraception guidance.
- Patient is approved for enrolment by the sponsor RTT.
Who cannot join
- Patients who meet any of the following criteria will be excluded from the EAP:
- Parents, legal representative or, if applicable, patients unwilling or unable to comply with the Treating Physician's treatment plan related to this EAP for any reason.
- Major illness or recent major surgery unrelated to MCT8 deficiency (in the Treating Physician's judgement), defined as:
- Conditions requiring repeated hospitalizations that are likely to confound ability to participate in the program.
- Major illness in the 3 months before the screening visit that is likely to confound the ability of the patient to participate fully within the program and/or confound the assessment of serum total T3 and/or safety.
- Major surgery within the 3 months before the screening visit, or planned to take place during the program, including but not limited to major abdominal/thoracic/neurosurgical procedures.
Show all 12Show fewer
- Major/minor abdominal and/or maxillofacial surgery that may inhibit the administration and/or absorption of tiratricol.
- Patients with any contra-indication for treatment with tiratricol or any excipients in the program treatment.
- Patients using thyroid hormone analogues- such as levothyroxine -or thionamides, such as propylthiouracil. Prior use of these drugs is not an exclusion criterion, provided the use of the medication has subsided and the thyroid hormone levels have stabilized after the cessation of these medications. For patients currently using these medications the switch to tiratricol should be made following the above and under the guidance of an endocrinologist with knowledge of MCT8 deficiency, if needed, after consultation with pharmacologist.
- Known hypersensitivity to tiratricol including any ingredient in the pharmaceutical formulation.
- Although very unlikely, as this is a severe X-linked disease: Women who are nursing or pregnant (or women who are planning to become pregnant during treatment with tiratricol).
- Patients eligible for clinical trials with tiratricol.
Trial locations and contacts
17 sites in 1 country.
17 sites in 1 country
United States17 sites
Children's Healthcare of Atlanta
Atlanta, Georgia, 30329
University of Alabama at Birmingham Hospital
Birmingham, Alabama, 35249
Ann & Robert H. Lurie Children's Hospital of Chicago
Chicago, Illinois, 60611
Cook Children's Health Care System
Fort Worth, Texas, 76106
Nemour's Children Hospital
Jacksonville, Florida, 32207
Valley Children's Hospital
Madera, California, 93636-8762
Le Bonheur Children's Hospital Foundation
Memphis, Tennessee, 38105
Children's Wisconsin
Milwaukee, Wisconsin, 53326
Louisiana State University Health Sciences Center and Children's Hospital
New Orleans, Louisiana, 70118
Icahn School of Medicine at Mount Sinai
New York, New York, 10029
Columbia University Irving Medical Center
New York, New York, 10032
Children's Hospital of Philadelphia
Philadelphia, Pennsylvania, 19104
Oregon Health and Science University
Portland, Oregon, 97239
Gillette's Children's Specialty Healthcare
Saint Paul, Minnesota, 55101
Rady Children's Hospital
San Diego, California, 92123
Baystate Medical Center
Springfield, Massachusetts, 01199
MultiCare Mary Bridge Children's Hospital
Tacoma, Washington, 98403
About this study
Official title: Expanded Access Program for Tiratricol in Patients With Monocarboxylate Transporter 8 Deficiency Also Known as Allan-Herndon-Dudley Syndrome (AHDS)
The goal of this program is to provide expanded access (i.e., before marketing authorization) to tiratricol as treatment for patients with monocarboxylate transporter 8 deficiency (MCT8 deficiency, also known as Allan-Herndon-Dudley syndrome [AHDS]), who in their Treating Physician's opinion, could benefit from tiratricol and meet the eligibility criteria.
Read the detailed description
This will be an open-label, single-arm, multi-center EAP, designed to provide treatment access in the US to tiratricol for eligible patients with MCT8 deficiency, also known as AHDS.
Patients will undergo clinical and safety assessments before tiratricol treatment initiation, during the titration phase and then at approximately 3-6 monthly intervals or more frequently if clinically indicated, following the initiation of tiratricol treatment and until treatment is completed or discontinued.
Adverse events (AEs) and serious adverse events (SAEs) will be recorded and reported as per FDA regulations.
- Being tested
- Tiratricol
- Keywords
- MCT8 Deficiency, Allan-Herndon-Dudley syndrome, Tiratricol, Triac, Expanded Access Program
- Medical subject headings
- Allan-Herndon-Dudley syndrome
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
TiratricolDrug
Tiratricol (3,3',5-triiodothyroacetic acid) is available as 350 µg tablets for oral administration (suspended in water and, if needed, mixed with food) or by percutaneous endoscopic gastrostomy (PEG), nasogastric or jejunal tube.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted22 Jun 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for Monocarboxylate Transporter 8 DeficiencyStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Expanded access
Sponsor and investigators
- Lead sponsor
- Rare Thyroid Therapeutics International AB
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- AnovoRx, Egetis Therapeutics AB (publ)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05911399
- Sponsor's protocol ID
- Tiratricol-EAP-Pro MCT8-2022-4
- Status last verified
- Oct 2026
- First submitted
- 9 Jun 2023
- Last updated
- 6 Oct 2026
- Results posted
- No
Publications
Groeneweg S, Peeters RP, Moran C, Stoupa A, Auriol F, Tonduti D, Dica A, Paone L, Rozenkova K, Malikova J, van der Walt A, de Coo IFM, McGowan A, Lyons G, Aarsen FK, Barca D, van Beynum IM, van der Knoop MM, Jansen J, Manshande M, Lunsing RJ, Nowak S, den Uil CA, Zillikens MC, Visser FE, Vrijmoeth P, de Wit MCY, Wolf NI, Zandstra A, Ambegaonkar G, Singh Y, de Rijke YB, Medici M, Bertini ES, Depoorter S, Lebl J, Cappa M, De Meirleir L, Krude H, Craiu D, Zibordi F, Oliver Petit I, Polak M, Chatterjee K, Visser TJ, Visser WE. Effectiveness and safety of the tri-iodothyronine analogue Triac in children and adults with MCT8 deficiency: an international, single-arm, open-label, phase 2 trial. Lancet Diabetes Endocrinol. 2019 Sep;7(9):695-706. doi: 10.1016/S2213-8587(19)30155-X. Epub 2019 Jul 31.
PubMed 31377265van Geest FS, Groeneweg S, van den Akker ELT, Bacos I, Barca D, van den Berg SAA, Bertini E, Brunner D, Brunetti-Pierri N, Cappa M, Cappuccio G, Chatterjee K, Chesover AD, Christian P, Coutant R, Craiu D, Crock P, Dewey C, Dica A, Dimitri P, Dubey R, Enderli A, Fairchild J, Gallichan J, Garibaldi LR, George B, Hackenberg A, Heinrich B, Huynh T, Klosowska A, Lawson-Yuen A, Linder-Lucht M, Lyons G, Monti Lora F, Moran C, Muller KE, Paone L, Paul PG, Polak M, Porta F, Reinauer C, de Rijke YB, Seckold R, Menevse TS, Simm P, Simon A, Spada M, Stoupa A, Szeifert L, Tonduti D, van Toor H, Turan S, Vanderniet J, de Waart M, van der Wal R, van der Walt A, van Wermeskerken AM, Wierzba J, Zibordi F, Zung A, Peeters RP, Visser WE. Long-Term Efficacy of T3 Analogue Triac in Children and Adults With MCT8 Deficiency: A Real-Life Retrospective Cohort Study. J Clin Endocrinol Metab. 2022 Feb 17;107(3):e1136-e1147. doi: 10.1210/clinem/dgab750.
PubMed 34679181
Study at a glance
From the registry record, last updated by the sponsor on 6 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Expanded Access Program for Tiratricol in Patients With Monocarboxylate Transporter 8 Deficiency Also Known as Allan-Herndon-Dudley Syndrome (AHDS)
- ClinicalTrials.gov ID
- NCT05911399
- Acronym / sponsor ID
- Tiratricol-EAP-Pro MCT8-2022-4
- Keywords
- MCT8 Deficiency, Allan-Herndon-Dudley syndrome, Tiratricol, Triac, Expanded Access Program
- Study type
- Expanded access
- Recruitment status
- Approved For Marketing
- Lead sponsor
- Rare Thyroid Therapeutics International ABIndustry (pharma, biotech, devices)
- Collaborators
- AnovoRx, Egetis Therapeutics AB (publ)
- First posted
- 22 Jun 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The goal of this program is to provide expanded access (i.e., before marketing authorization) to tiratricol as treatment for patients with monocarboxylate transporter 8 deficiency (MCT8 deficiency, also known as Allan-Herndon-Dudley syndrome [AHDS]), who in their Treating Physician's opinion, could benefit from tiratricol and meet the eligibility criteria.
Detailed description
This will be an open-label, single-arm, multi-center EAP, designed to provide treatment access in the US to tiratricol for eligible patients with MCT8 deficiency, also known as AHDS.
Patients will undergo clinical and safety assessments before tiratricol treatment initiation, during the titration phase and then at approximately 3-6 monthly intervals or more frequently if clinically indicated, following the initiation of tiratricol treatment and until treatment is completed or discontinued.
Adverse events (AEs) and serious adverse events (SAEs) will be recorded and reported as per FDA regulations.
Study design
Who may qualify
- Sex
- All
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (7 listed)
- Diagnosis of MCT8 deficiency confirmed with a genetic test.
- Either tiratricol treatment naïve, or patients who may be on a stable dose of tiratricol having transferred from the Phase 3 MCT8-2021-3 (ReTRIACt) study (NCT05579327) or prior individual investigational new drug (IND).
- In the Treating Physician's medical opinion, the potential benefits of treatment with tiratricol outweigh the potential risks for the patient.
- Patient or legal representative provided signed and dated informed consent to be treated with tiratricol, through this EAP.
- Given the severity of the disease, sexual activity in these patients is deemed unlikely. However, where, at the discretion of the Treating Physician sexual activity is possible for the patient, patients must follow protocol-specified-contraception guidance.
Key exclusion criteria (12 listed)
- Parents, legal representative or, if applicable, patients unwilling or unable to comply with the Treating Physician's treatment plan related to this EAP for any reason.
- Major illness or recent major surgery unrelated to MCT8 deficiency (in the Treating Physician's judgement), defined as:
- Patients with any contra-indication for treatment with tiratricol or any excipients in the program treatment.
- Patients using thyroid hormone analogues- such as levothyroxine -or thionamides, such as propylthiouracil. Prior use of these drugs is not an exclusion criterion, provided the use of the medication has subsided and the thyroid hormone levels have stabilized after the cessation of these medications. For patients currently using these medications the switch to tiratricol should be made following the above and under the guidance of an endocrinologist with knowledge of MCT8 deficiency, if needed, after consultation with pharmacologist.
- Known hypersensitivity to tiratricol including any ingredient in the pharmaceutical formulation.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| TiratricolTiratricol (3,3',5-triiodothyroacetic acid) is available as 350 µg tablets for oral administration (suspended in water and, if needed, mixed with food) or by percutaneous endoscopic gastrostomy (PEG), nasogastric or jejunal tube. | Drug | – |
Primary outcome
Not reported in the source record.
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 6 Oct 2026.
- Background: PubMed 31377265Groeneweg S, Peeters RP, Moran C, Stoupa A, Auriol F, Tonduti D, Dica A, Paone L, Rozenkova K, Malikova J, van der Walt A, de Coo IFM, McGowan A, Lyons G, Aarsen FK, Barca D, van Beynum IM, van der Knoop MM, Jansen J, Manshande M, Lunsing RJ, Nowak S, den Uil CA, Zillikens MC, Visser FE, Vrijmoeth P, de Wit MCY, Wolf NI, Zandstra A, Ambegaonkar G, Singh Y, de Rijke YB, Medici M, Bertini ES, Depoorter S, Lebl J, Cappa M, De Meirleir L, Krude H, Craiu D, Zibordi F, Oliver Petit I, Polak M, Chatterjee K, Visser TJ, Visser WE. Effectiveness and safety of the tri-iodothyronine analogue Triac in children and adults with MCT8 deficiency: an international, single-arm, open-label, phase 2 trial. Lancet Diabetes Endocrinol. 2019 Sep;7(9):695-706. doi: 10.1016/S2213-8587(19)30155-X. Epub 2019 Jul 31.
- Background: PubMed 34679181van Geest FS, Groeneweg S, van den Akker ELT, Bacos I, Barca D, van den Berg SAA, Bertini E, Brunner D, Brunetti-Pierri N, Cappa M, Cappuccio G, Chatterjee K, Chesover AD, Christian P, Coutant R, Craiu D, Crock P, Dewey C, Dica A, Dimitri P, Dubey R, Enderli A, Fairchild J, Gallichan J, Garibaldi LR, George B, Hackenberg A, Heinrich B, Huynh T, Klosowska A, Lawson-Yuen A, Linder-Lucht M, Lyons G, Monti Lora F, Moran C, Muller KE, Paone L, Paul PG, Polak M, Porta F, Reinauer C, de Rijke YB, Seckold R, Menevse TS, Simm P, Simon A, Spada M, Stoupa A, Szeifert L, Tonduti D, van Toor H, Turan S, Vanderniet J, de Waart M, van der Wal R, van der Walt A, van Wermeskerken AM, Wierzba J, Zibordi F, Zung A, Peeters RP, Visser WE. Long-Term Efficacy of T3 Analogue Triac in Children and Adults With MCT8 Deficiency: A Real-Life Retrospective Cohort Study. J Clin Endocrinol Metab. 2022 Feb 17;107(3):e1136-e1147. doi: 10.1210/clinem/dgab750.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
17 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Tiratricol in people with Monocarboxylate Transporter 8 Deficiency and Allan-Herndon-Dudley Syndrome, run by Rare Thyroid Therapeutics International AB at 17 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 7 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 6 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 17 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05911399, which also lists 2 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 6 Oct 2026.