Evaluating VX-670 for treating Myotonic Dystrophy Type 1 in adults

A Phase 1/2, Randomized, Double-blind, Placebo-controlled Single- and Multiple-dose Escalation Study Evaluating the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of VX-670 in Adult Subjects With Myotonic Dystrophy Type 1

Phase1; Phase2 Interventional Vertex Pharmaceuticals Incorporated · NCT06185764

This study is testing a new drug called VX-670 to see if it can safely help adults with Myotonic Dystrophy Type 1 feel better.

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Enrollment44 (estimated)
Ages18 Years to 64 Years
SexAll
SponsorVertex Pharmaceuticals Incorporated Industry-sponsored
Locations26 sites (San Carlos, California and 25 other locations)
Trial IDNCT06185764 on ClinicalTrials.gov

What this trial studies

This study aims to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of VX-670 in adult participants diagnosed with Myotonic Dystrophy Type 1 (DM1). Participants will receive either VX-670 or a placebo in varying doses to determine the drug's effects. The study will involve both Phase 1 and Phase 2 evaluations to gather comprehensive data on the drug's performance and safety profile. The research is crucial for understanding how VX-670 may improve outcomes for individuals with this condition.

Who should consider this trial

Good fit: Ideal candidates for this study are adults with a documented clinical diagnosis of DM1 and a genetic test confirming the presence of a CTG repeat of at least 100.

Not a fit: Patients with a history of other significant illnesses or clinical conditions as outlined in the protocol may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could lead to a new treatment option that significantly improves the quality of life for patients with Myotonic Dystrophy Type 1.

How similar studies have performed: While there have been studies on Myotonic Dystrophy, the specific approach of using VX-670 is novel and has not been extensively tested in this context.

Eligibility criteria

Show full inclusion / exclusion criteria
Key Inclusion Criteria:

\- Documented clinical diagnosis of DM1 with age of onset greater than (\>) 1 year of age and documented positive genetic test for DM1 in the subject with cytosine thymine guanine (CTG) repeat of at least 100

Key Exclusion Criteria:

\- History of any illness or any clinical condition as pre-specified in the protocol

Other protocol defined Inclusion/Exclusion criteria may apply.

Where this trial is running

San Carlos, California and 25 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Myotonic Dystrophy Type 1DM1DM2Myotonic Dystrophy 1Myotonic Dystrophy 2Myotonic DystrophyDMMyotonia
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.