Phase 3
N=53
Efficacy and Safety of Tideglusib in Congenital Myotonic Dystrophy
Congenital Myotonic Dystrophy
Bottom Line
View on ClinicalTrials.gov: NCT03692312 ↗Enrolled (actual)
53
Serious AEs
1.9%
Results posted
Sep 2025
Primary outcome: Primary: Change in Clinician-Completed Congenital DM1 Rating Scale (CDM1-RS) — -1.65; -3.40 score on a scale — p=0.0514
Study Design & Population
- Study type
- Interventional
- Phase
- Phase 3
- Interventions
- Tideglusib (Drug); Placebo (Drug)
- Age
- Pediatric · 6+ yrs
- Sex
- All
- Sponsor
- AMO Pharma Limited
- Primary completion
- Apr 2023
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Change in Clinician-Completed Congenital DM1 Rating Scale (CDM1-RS) |
-1.65; -3.40 | 0.0514 |
| SECONDARY Change in Clinical Global Impression- Improvement Scale (CGI-I) Scores |
3.11; 2.77 | 0.2124 |
| SECONDARY Change in Top 3 Caregiver Concerns Visual Analogue Scale (VAS) Score |
-1.74; -6.47 | <0.0001 sig |
| SECONDARY Caregiver Completed Congenital DM1 Rating Scale (CC-CDM1-RS) |
-0.18; -3.36 | 0.0059 sig |
| SECONDARY Clinical Global Impression - Severity Scale (CGI-S) |
-0.20; -0.12 | 0.4634 |
| SECONDARY 10-meter Walk-run Test |
-0.54; -0.19 | 0.5385 |
| SECONDARY Number of Adverse Events (AEs), Including Serious Adverse Events (SAEs), Between Screening to End of Study. |
20; 19; 1; 0; 0; 0 | — |
| SECONDARY Number of Abnormal Findings in Objective Assessments (e.g. Laboratory Values, ECGs, Vital Signs and Bone Mineral Density) Between Screening and End of Study. |
1; 0; 1; 0; 1; 0 | — |
| SECONDARY CDM1-RS Independent Central Rater Score (CDM1-RS) |
-2.26; -2.55 | 0.7110 |
| SECONDARY CGI-I Independent Central Rater Score (CGI-I) |
2.74; 2.65 | 0.7861 |
| SECONDARY Independent Rater Clinical Global Impression - Severity Scale (CGI-S) |
-0.15; -0.21 | 0.6282 |
Summary
This is a randomized, multicenter, double-blind, placebo-controlled, Phase 2/3 study of patients (aged 6 to 16 years) diagnosed with Congenital Myotonic Dystrophy (Congenital DM1).
Eligibility Criteria
Inclusion Criteria
- Male or female children and adolescents aged ≥6 years and ≤16 years
- Diagnosis of Congenital DM1 (also known as Steinert's disease)
- Diagnosis must be genetically confirmed
- One or more of the following clinically relevant (e.g. requiring medical intervention) signs or symptoms was evident within the first month after birth:
- Hypotonia
- Generalized weakness
- Respiratory insufficiency
- Feeding difficulties
- Clubfoot or another musculoskeletal deformity
- Subject must be able to walk and complete the 10-meter walk-run test (orthotics/splints allowed, forearm crutches are not allowed)
- 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
- 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
Exclusion Criteria
- Not able to walk; (full time wheel chair use)
- 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 Screening
- Use of strong CYP3A4 inhibitors (e.g clarithromycin, telithromycin, ketoconazole, itraconazole, posaconazole, nefazodone, idinavir and ritonavir) within 4 weeks prior to Baseline
- 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
- Existing or historical medical conditions or complications (e.g. neurological, cardiovascular, renal, hepatic, endocrine, gastrointestinal or respiratory disease) which would cause the investigator to conclude that the subject will not be able to perform the study procedures or assessments or would confound interpretation of data obtained during assessment
- Hypersensitivity to tideglusib and its excipients including allergy to strawberry
Data sourced from ClinicalTrials.gov (NCT03692312). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.