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Dyne Therapeutics Announces Initiation of Phase 3 FORZETTO Trial of Z-Rostudirsen in Duchenne Muscular Dystrophy (DMD) Ahead of Planned BLA Submission for U.S. Accelerated Approval

$DYNPress releaseMay 20, 2026, 7:46 AM ETRead the release

Dyne Therapeutics has initiated the Phase 3 FORZETTO trial for z-rostudirsen in Duchenne muscular dystrophy (DMD) patients amenable to exon 51 skipping. The 72-week, placebo-controlled study will enroll approximately 90 participants, with the primary endpoint being rise from floor (RFF) velocity at Week 73.

Key figures

Drug Name
z-rostudirsen (DYNE-251)
Phase Of Trial
Phase 3
Trial name
FORZETTO
Dosing regimen
20 mg/kg every 4 weeks
Primary endpoint
Rise from floor (RFF) velocity
Enrollment target
90
Trial duration weeks
72

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