ClinicalTrials.gg
Enrolling by invitationNCT06066580MESAUpdated Sep 17, 2026

Open-Label Extension of EDG-5506 in Participants With Becker Muscular Dystrophy

A Phase 2 interventional study of Sevasemten in Becker Muscular Dystrophy, sponsored by Edgewise Therapeutics, Inc.. Enrolling by invitation at 48 sites in 12 countries. Open to male participants. Per ClinicalTrials.gov, last updated 2026-09-17.

Sponsored by Edgewise Therapeutics, Inc. · Phase 2, Interventional, and Treatment

Phase
Phase 2
Study type
Interventional
Enrollment
260
Allocation
Not applicable
Sex
Male
01

Where this study stands

Counted across the records on this site · 2026-11-12

Among 232 studies in Muscular Dystrophy, Duchenne with a site in United States — 36 open to participants now, 60 under way, 8 of them phase 3. Muscular Dystrophy, Duchenne · United States.

Planned enrollment
5th of 171
260 · median 25
Started
2023
with 5 others
Phase 2
57 of 232
4 open now
Primary completion
2031-02
later than 52 of 59 live
Registered
197th of 232
by date
Lead sponsor
6 of 232
Edgewise Therapeutics, Inc.

Among the 232 studies in Muscular Dystrophy, Duchenne with a site in United States, this one is the 5th largest by planned enrollment of the 171 interventional ones that give a count, is one of 6 that started in 2023, is one of 57 in phase 2, reaches primary completion later than 52 of the 59 other live ones, and was the 197th registered.

Muscular Dystrophy, Duchenne

481 studies on the registry are indexed under Muscular Dystrophy, Duchenne; 108 are open to participants now.

Browse Muscular Dystrophy, Duchenne studies →

Open to participants now

36 of the 232 studies in Muscular Dystrophy, Duchenne with a site in United States are open now. Recruiting first, the newest first:

31 more — sign in →

All 36 open studies →

A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →

Who these studies take

Of the 66 Muscular Dystrophy, Duchenne studies recruiting now, 30 (45%) set no upper age limit and 34 (52%) stop at 75 or younger; 60 take children under 18; 12 take healthy volunteers.

This study: male · no healthy volunteers.

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02

Study summary

EDG-5506-203 MESA is an open-label extension study to assess the long-term effect of sevasemten (EDG-5506) on safety, biomarkers, and functional measures in adults and adolescents with Becker muscular dystrophy

Read the detailed description

This is an open-label, treatment extension study to evaluate the safety, tolerability, and durability of effect in long-term dosing of sevasemten. EDG-5506-203 MESA will provide continued access to sevasemten treatment to participants with Becker muscular dystrophy who were previously enrolled in EDG-5506-002 ARCH, completed EDG-5506-201 CANYON and GRAND CANYON, or completed EDG-5506-202 DUNE.

03

Conditions studied

  • Becker Muscular Dystrophy

Keywords

  • Becker Muscular Dystrophy
04

Who can participate

Ages eligible
Child (0–17), Adult (18–64), Older adult (65+)
Sexes eligible
Male
Accepts healthy volunteers
No

Eligibility criteria

Key Inclusion Criteria:

1. Males with a diagnosis of BMD and participation in EDG-5506-002 ARCH, EDG-5506-201 CANYON and GRAND CANYON, or EDG-5506-202 DUNE. Participants are eligible if they complete the respective prior study visits as follows:

  • EDG-5506-002 ARCH: Complete the final study Visit 27 [Month 24]; or, completion of the ET visit prior to Visit 27 [Month 24]
  • EDG-5506-201 CANYON and GRAND CANYON: Complete the final study visit (Cohorts 1, 2, 4, and 5: Visit 12 [Month 12]; Cohort 6: Visit 11 [Month 18])
  • EDG-5506-202 DUNE: Complete at least 36 weeks of open-label treatment (Visit 14 [Week 52])

Key Exclusion Criteria:

  1. Any changes during or following participation in EDG-5506-002, EDG-5506-201, or EDG-5506-202 that would affect the potential safety of the participant to receive sevasemten.
  2. Receiving moderate or strong cytochrome P450 inhibitors or inducers.
  3. Receipt of an drug other than sevasemten within 30 days or 5 half-lives (whichever is longer) of dosing in the present study.
  4. Receipt of oral for the treatment of BMD in the previous 6 months.
Terms in these criteria, in plain language(4)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

CYP3A (CYP3A4) inhibitors and inducers

CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.

Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.

Investigational drug or device

A drug or device being studied in a clinical trial.

It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.

Corticosteroids (steroids)

Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.

Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
260 participants (estimated)

Study arms

  • Experimental
    Treatment

    Drug: Sevasemten

    Drug: Sevasemten

Interventions

  • Sevasemten is administered orally once per day

06

What researchers measure

Primary outcomes

  1. Number of adverse events in those treated with sevasemten

    Time frame: 55 Months

  2. Severity of adverse events in those treated with sevasemten

    Time frame: 55 Months

Secondary outcomes

  1. Incidence of treatment-emergent abnormal clinical chemistry laboratory test results

    Time frame: 54 Months

  2. Incidence of treatment-emergent abnormal hematology laboratory test results

    Time frame: 54 Months

07

Study locations

48 sites
08

References and documents

Related links

Individual participant data

Plan to share: No

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Nov 2023 (actual). Primary completion is estimated for Feb 2031, 87 months after the start.

Of 40 industry-sponsored phase 2 interventional studies under Muscular Dystrophy, Duchenne, half reached primary completion within 31 months of starting (the median), counting those still running; a quarter within 20 and three quarters within 42. This study's planned 87 months is above that.

Counting every sponsor, half of 47 studies reached it within 31 months; a quarter within 20 and three quarters within 42.

How these figures are worked out, and which studies are left out of them.

Registered
Sep 27, 2023
First posted
Oct 4, 2023
StartActual
Nov 2, 2023
Primary completionEst.
Feb 2031
CompletionEst.
Feb 2031
Last update
Sep 17, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Sep 17, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06066580
Lead sponsor
Edgewise Therapeutics, Inc.
Collaborators
Medpace, Inc.
Responsible party
Sponsor
First posted
Oct 4, 2023
Start date
Nov 2, 2023
Primary completion
Feb 2031 (estimated)
Completion
Feb 2031 (estimated)
Last update
Sep 17, 2026

Study contacts

Joanne M. Donovan, MD, PhD
study chair · Edgewise Therapeutics, Inc.

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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No contact was published for this record. The registry link below has the sponsor’s details.

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Discussion

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Studies of the drug tested here: Sevasemten

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