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Congenital Myotonic DystrophyPhase 2/3REACH CDM XNCT05004129

Safety and Efficacy of Tideglusib in Congenital or Childhood Onset Myotonic Dystrophy

A Phase 2/3 study testing Tideglusib in people with Congenital Myotonic Dystrophy, run by AMO Pharma Limited at 14 sites in 4 countries.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This is an open-label phase 2/3 study for individuals with Congenital Myotonic Dystrophy (Congenital DM1) who participated in the preceding AMO-02-MD-2-003 study or individuals with either Congenital or Childhood Onset DM1 who are treatment naïve. Read more about this study

Who is it for?
Ages 6 to 45 years
Conditions the study is for
Congenital Myotonic Dystrophy
What is being tested?
Tideglusib
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
76 participants
Where
14 sitesin 4 countries
Study dates
23 Aug 2021to 31 Dec 2026
Phase
Phase 2/3
Are there results?
Not yet: the study is under way

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 6 to 45 years
  • All sexes
  • No healthy volunteers
  • Child, Adult

Who may be able to join

  • Subjects who do not enter this study directly from completing the AMO-02-MD-2-003 study (i.e. subjects who did not complete AMO-02-MD-2-003, subjects who completed AMO-02-MD-2-003 but did not directly rollover or subjects who are re-entering AMO-02-MD-2-004), will not be considered eligible for the study without meeting all of the criteria below:
  • Subjects under study must be individuals with a diagnosis of Congenital or Childhood Onset DM1.
  • Diagnosis must be genetically confirmed
  • Subjects must be male or female aged ≥6 years to ≤45 years at Screening
  • Subjects must have a Clinical Global Impression - Severity (CGI-S) score of 3 or greater at Screening (V-1)
  • Written, voluntary informed consent must be obtained before any study related procedures are conducted. Where a parent or legally authorized representative (LAR) provides consent, there must also be assent from the subject (as required by local regulations)
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  • Subject's caregiver must be willing and able to support participation for duration of study
  • Subject must be willing and able to comply with the required food intake restrictions as outlined per protocol
  • Subjects entering directly from completing the antecedent AMO-02-MD-2-003 study will not be considered eligible for the study without meeting all of the criteria below:
  • Subjects who have completed the antecedent AMO-02-MD-2-003 study through V11
  • Written, voluntary informed consent must be obtained before any study related procedures are conducted. Where a parent or LAR provides consent, there must also be assent from the subject (as required by local regulations)
  • Subject's caregiver must be willing and able to support participation for duration of study
  • Subject must be willing and able to comply with the required food intake restrictions as outlined per protocol

Who cannot join

  • Body mass index (BMI) less than 13.5 kg/m² or greater than 40 kg/m²
  • New or change in medications/therapies within 4 weeks prior to Eligibility/Baseline Visit
  • Use within 4 weeks prior to Eligibility/Baseline Visit of strong CYP3A4 inhibitors (eg.clarithromycin, telithromycin, ketoconazole, itraconazole, posaconazole, nefazodone, idinavir and ritonavir)
  • Concurrent use of drugs metabolized by CYP3A4 with a narrow therapeutic window (e.g. warfarin and digitoxin)
  • Current enrollment in a clinical trial of an investigational drug or enrollment in a clinical trial of an investigational drug in the last 6 months other than the AMO-02- MD-2-003 study
  • Existing or historical medical conditions or complications (eg. neurological, cardiovascular, renal, hepatic, gastrointestinal, endocrine or respiratory disease) that may impact the interpretability of the study results
  • Hypersensitivity to tideglusib or any components of its formulation including allergy to strawberry

Trial locations and contacts

14 sites in 4 countries. Contact the study team or a site near you to ask about taking part.

14 sites in 4 countries

United States10 sites, 8 recruiting
  • Lurie's Children's Hospital

    Chicago, Illinois, 60611

    Joseph Alberts, 312-227-4449, jalberts@luriechildrens.org

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting
  • University of Iowa Hospitals and Clinics

    Iowa City, Iowa, 52242

    Laura Knosp, 319-384-6277, laura-knosp@uiowa.edu

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting
  • Arkansas Children's Hospital

    Little Rock, Arkansas, 72202

    Annette Guy, 501-364-3380, GuyEA@archildrens.org

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting
  • University of California, Los Angeles (UCLA)

    Los Angeles, California, 90095

    Enrolling by invitation
  • Children's Hospital of The King's Daughters

    Norfolk, Virginia, 23507

    Withdrawn
  • Stanford University

    Palo Alto, California, 94304

    Enrolling by invitation
  • University of Pittsburgh Medical Center

    Pittsburgh, Pennsylvania, 15213

    Heather DiCostanzo, 412-692-7660, follhl@upmc.edu

    Caitlyn Daley, catilyn.daley@reachcdm.com

    Recruiting
  • Virginia Commonwealth University-Department of Neurology - Muscular Dystrophy Translational Research Program

    Richmond, Virginia, 23219

    Completed
  • University of Rochester - Medical Center

    Rochester, New York, 14642

    James Hilbert, 585-273-5590, james_hilbert@URMC.Rochester.eud

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting
  • University of Utah Clinical Neurosciences Center

    Salt Lake City, Utah, 84132

    Domink May, 801-587-4864, dominik.may@hsc.utah.edu

    Caitlyn Daley, catilyn.daley@reachcdm.com

    Recruiting

Other trials in United States

Canada2 sites, 2 recruiting
  • Children's Hospital London Health Sciences Centre (LHSC)

    London, Ontario, N6A 4G5

    Enrolling by invitation
  • Children's Hospital of Eastern Ontario

    Ottawa, Ontario, K1H 8L1

    Emilie Hill-Smith, 613-737-7600 x4017, ehillsmith@cheo.on.ca

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting

Other trials in Canada

Australia1 site, 1 recruiting
  • The Bright Alliance

    Randwick, New South Wales, 2031

    AMO Study Coordinator, 02 9382 5534, SCHN-SCHClinicalTrials@health.nsw.gov.au

    Caitlyn Daley, caitlyn.daley@reachcdm.com

    Recruiting

Other trials in Australia

New Zealand1 site
  • New Zealand Clinical Research (NZCR)

    Auckland, 1010

    Completed

Other trials in New Zealand

About this study

Official title: An Open-Label Study to Evaluate the Long-Term Safety and Efficacy of Tideglusib for the Treatment of Congenital or Childhood Onset DM1 (REACH CDM X)

This is an open-label phase 2/3 study for individuals with Congenital Myotonic Dystrophy (Congenital DM1) who participated in the preceding AMO-02-MD-2-003 study or individuals with either Congenital or Childhood Onset DM1 who are treatment naïve.

Read the detailed description

This is an open-label study of either a weight-adjusted 1000 mg fixed dose or a weight banded fixed dose of tideglusib across a 52-week treatment period with an open-ended optional extended access period. The subjects are children and adolescents with Congenital DM1 who participated in the antecedent AMO-02-MD-2-003 study or individuals with either Congenital or Childhood onset DM1 who are treatment naïve.

Being tested
Tideglusib
Keywords
Tideglusib, AMO-02-MD-2-004, Congenital Myotonic Dystrophy, Myotonic Dystrophy, Dystrophia Myotonica, Myotonia Atrophica, Myotonia Dystrophica, Myotonic Dystrophy, Congenital, Steinert Disease, Steinert Myotonic Dystrophy, Steinert's Disease
Medical subject headings
Myotonic Dystrophy

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • TideglusibDrug

    Tideglusib dosing will be weight-adjusted at 400 mg, 600 mg, or 1000 mg dose levels, or weight banded fixed doses of 400 mg, 600 mg, 800 mg or 1000 mg, with each subject starting at a weight-adjusted 400 mg dose level for 2 weeks, then up titrating to a weight-adjusted 600 mg dose level for the next 2 weeks.

Study groups in NCT05004129
Study groupRoleWhat they receive
TideglusibExperimentalWeight adjusted or weight banded tideglusib, orally, once daily
Receives: Drug: Tideglusib

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Safety (Adverse Events)

    The incidence of AEs, including SAEs, and abnormal findings in objective assessments (e.g. laboratory values, ECGs and vital signs) from Screening to Enrolment (where applicable), from Enrolment to End of Treatment (52 Weeks), and End of Treatment to the End of Follow-up period.

    Measured: 52 Weeks

  2. Safety (Adverse Events) - With Optional Expanded Access

    The incidence of AEs, including SAEs, and abnormal findings in objective assessments (e.g. laboratory values, ECGs and vital signs) from End of Treatment to End of Optional Extended Access, and End of Optional Extended Access to the End of Follow-up period.

    Measured: Week 60 and every 8 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  3. Clinician-Completed Congenital DM1 Rating Scale (CDM1-RS)

    The Clinician-completed Congenital DM1 Rating Scale is an 11-item rating scale completed by the clinician to score the symptom severity of domains that are clinically relevant in Congenital DM1.

    Measured: 52 Weeks

Secondary outcomes (16)
  1. Clinician-Completed Congenital DM1 Rating Scale (CDM1-RS) - With Optional Expanded Access

    The Clinician-completed Congenital DM1 Rating Scale is an 11-item rating scale completed by the clinician to score the symptom severity of domains that are clinically relevant in Congenital DM1.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  2. Clinical Global Impressions Improvement Scale (CGI-I)

    The CGI-I requires the clinician to rate how much the subject's illness has changed (improved, worsened or stayed the same) relative to a baseline state.

    Measured: 54 Weeks

  3. Clinical Global Impressions Improvement Scale (CGI-I) - With Optional Expanded Access

    The CGI-I requires the clinician to rate how much the subject's illness has changed (improved, worsened or stayed the same) relative to a baseline state.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  4. Top 3 Caregiver Concerns Visual Analogue Scale (VAS) score

    The Top 3 concerns VAS allows caregivers to identify their main three causes of concern, related to the subject's myotonic dystrophy, rather than these being pre-specified within a scale and then rating how these concerns have changed at specific time-points during the study.

    Measured: 54 weeks

  5. Top 3 Caregiver Concerns Visual Analogue Scale (VAS) score - With Optional Expanded Access

    The Top 3 concerns VAS allows caregivers to identify their main three causes of concern, related to the subject's myotonic dystrophy, rather than these being pre-specified within a scale and then rating how these concerns have changed at specific time-points during the study.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  6. Caregiver Completed Congenital DM1 Rating Scale (CC-CDM1-RS)

    CC-CDM1-RS provides a caregiver assessment of the subject on symptoms that may occur in individuals with CDM1. There are a total of 11 symptoms that the caregiver is asked to rate from 0 to 4 based on overall severity.

    Measured: 52 weeks

  7. Caregiver Completed Congenital DM1 Rating Scale (CC-CDM1-RS) - With Optional Expanded Access

    CC-CDM1-RS provides a caregiver assessment of the subject on symptoms that may occur in individuals with CDM1. There are a total of 11 symptoms that the caregiver is asked to rate from 0 to 4 based on overall severity.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  8. Clinical Global Impressions Severity Scale (CGI-S)

    The CGI-S is a 7-point Likert type scale that requires the clinician to rate the severity of the subject's illness at the time of assessment, relative to the clinician's past experience with subjects who have the same diagnosis.

    Measured: 54 weeks

  9. Clinical Global Impressions Severity Scale (CGI-S) - With Optional Expanded Access

    The CGI-S is a 7-point Likert type scale that requires the clinician to rate the severity of the subject's illness at the time of assessment, relative to the clinician's past experience with subjects who have the same diagnosis.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  10. Autism Behavior Inventory- Clinician (ABI-C)

    ABI-C is a 14 item rating scale requires the clinician to assess the core features of Autism Spectrum Disorder as well as common associated behaviors.

    Measured: 52 Weeks

  11. Socialization, Communication, Daily Living, and Adaptive Behavior Composite standard scores of the Vineland Adaptive Behavior Scale - Survey Interview

    The Vineland Adaptive Behavior Scales require the clinician to measure personal and social skills needed for everyday living. It provides a targeted assessment of adaptive behavior via a semi-structured parent or caregiver interview.

    Measured: 52 Weeks

  12. 10-meter walk-run test

    The 10-meter walk/run test is a performance measure used to assess walking speed in meters per second over a short distance. It can be used as an assessment of functional mobility.

    Measured: 52 Weeks

  13. Plasma Troponin T levels

    Troponin T can be used as a biomarker for cardiac dysfunction but can also be elevated in DM1 patients without evident cardiac dysfunction.

    Measured: 52 Weeks

  14. Plasma Troponin T levels - With Optional Expanded Access

    Troponin T can be used as a biomarker for cardiac dysfunction but can also be elevated in DM1 patients without evident cardiac dysfunction.

    Measured: Week 68 and every 16 weeks thereafter up until discontinuation or study closure, assessed up to Week 132

  15. Blood Leukocytes CTG Repeats

    A genomic blood sample will be taken from all subjects to confirm the average number of repeats at sampling and estimate the number of leukocyte CTG repeats inherited for an individual subject.

    Measured: Baseline and Week 52

  16. Blood Leukocytes CTG Repeats - With Optional Expanded Access

    A genomic blood sample will be taken from all subjects to confirm the average number of repeats at sampling and estimate the number of leukocyte CTG repeats inherited for an individual subject. For subjects that have already passed Week 52 at implementation of this endpoint, a single genomic blood sample will taken at the next in-clinic OEA visit.

    Measured: Week 52 or later

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted13 Aug 2021
  2. Study start23 Aug 2021
  3. Primary completion31 Dec 2026 (estimated)
  4. Study completion31 Dec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2/3
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
76 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05004129
Sponsor's protocol ID
AMO-02-MD-2-004
Acronym
REACH CDM X
Status last verified
May 2025
First submitted
5 Aug 2021
Last updated
28 May 2025
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 2/3 study testing Tideglusib in people with Congenital Myotonic Dystrophy, run by AMO Pharma Limited at 14 sites in 4 countries.

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 13 inclusion and 7 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: looking for participants now, as of the sponsor's last update on 28 May 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 14 sites in United States, Canada, Australia, New Zealand. 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.

What does this combined phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Each site lists its own contact: choose the nearest one under Trial locations. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Safety (Adverse Events) (time frame: 52 Weeks). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
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 28 May 2025.

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