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BMN 351

Phase 2

Duchenne Muscular Dystrophy (DMD) | Small molecule | Neurology |BioMarin Pharmaceutical Inc.|Last Updated: Jul 24, 2026

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment18

FDA Designations

No designations recorded

Clinical trial landscape

BMN 351 · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT07573631An Open-Label Extension Study to Evaluate the Long-term Safety and Efficacy of BMN 351 in Participants With Duchenne Muscular DystrophyDuchenne Muscular Dystrophy (DMD)
ENROLLING BY_INVITATION18 Analytics
PHASE2ENROLLING BY_INVITATION
An Open-Label Extension Study to Evaluate the Long-term Safety and Efficacy of BMN 351 in Participants With Duchenne Muscular Dystrophy
Duchenne Muscular Dystrophy (DMD)Unlock trial analytics

Study Endpoints

Primary Endpoints

To assess the long-term safety and tolerability of BMN 351 in participants with DMD
Through study completion, at least 1 year

The safety and tolerability of BMN 351 will be assessed based on the incidence of adverse and serious adverse events.

To evaluate and safety and tolerability of single and multiple doses of BMN 351 (incidence, severity, and dose-relationship of adverse effects and changes in laboratory parameters).
Up to 97 weeks.

The safety and tolerability of BMN 351 will be assessed based on the incidence of adverse and serious adverse events.

Secondary Endpoints

To evaluate the effect of BMN 351 on physical function
Change from baseline and subsequent 24-week incremental visits
Pharmacokinetics (PK) concentration of BMN 351 in plasma, urine and muscle approximately every 8 weeks for up to 97 weeks.
Serial measurements pre and post infusion.
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BMN 351EXPERIMENTALParticipants from 351-201 enrolling in 351-202 will initially receive BMN 351 at the dose level at which they completed 351-201. Once all 351-201 participants have completed their Week 25 visit in 351-202, available safety and PD data will be analyzed and a single optimal dose level will be selected for 351-202. All participants from 351-201 will transition to that dose level at their next applicable visit.
Cohort 1AEXPERIMENTALCohort 1A will consist of both a single ascending dose (SAD) part and a multiple ascending dose (MAD). BMN 351 will be administered once every 2 weeks during the SAD portion of the study for up to 8 weeks and once weekly during the MAD portion for up to 89 weeks.
Cohort 1BEXPERIMENTALBMN 351 low dose will be administered once weekly for up to 97 weeks
Cohort 2EXPERIMENTALBMN 351 medium dose will be administered once weekly for up to 73 weeks
Cohort 3EXPERIMENTALBMN 351 high dose will be administered once weekly for up to 48 weeks

Interventions

NameTypeDescription
BMN 351DRUGAnti-sense Oligonucleotide BMN 351 will be administered intravenously
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Eligibility Criteria

Age Range4 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites6

Inclusion Criteria: * Participants must have completed 351-201 without permanent discontinuation of the investigational medicinal product (IMP) or withdrawal from the study * Currently receiving treatment with oral corticosteroids, on a stable dose regimen during 351-201, and must remain on a consi...

Countries:ItalyNetherlandsSpainTurkey (Türkiye)United Kingdom
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Recent Changes (Last 90 Days)

LOWJul 24, 2026NCT07573631startDate: changed
LOWJul 24, 2026NCT07573631startDate: changed
MEDIUMJun 25, 2026NCT06280209Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMJun 25, 2026NCT06280209Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMJun 25, 2026NCT06280209Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about BMN 351

What is BMN 351 used for?

BMN 351 is an investigational small molecule being developed for Duchenne Muscular Dystrophy (DMD), a genetic neuromuscular disorder. It is currently in Phase 1 clinical development, meaning it has not yet been approved by regulatory authorities and is still being studied for safety and efficacy in patients.

Who makes BMN 351?

BMN 351 is being developed by BioMarin Pharmaceutical Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol BMRN. The company is conducting clinical trials to evaluate the drug's safety, tolerability, pharmacokinetics, and pharmacodynamics in participants with Duchenne Muscular Dystrophy.

What phase is BMN 351 in?

BMN 351 is in Phase 1 clinical development. The primary study is a Phase 1/2 trial that is active but not recruiting participants. An open-label extension study, listed as Phase 2, is also enrolling by invitation to evaluate long-term safety and efficacy. The drug remains investigational and is not FDA approved.

What clinical trials is BMN 351 in?

BMN 351 is being studied in two clinical trials. The first is NCT06280209, a Phase 1/2 study assessing safety, tolerability, pharmacokinetics, and pharmacodynamics in participants with Duchenne Muscular Dystrophy. The second is NCT07573631, an open-label extension study evaluating long-term safety and efficacy. Both trials enroll males aged 4 years and older.

Is BMN 351 the same as any other drug?

No alternative names for BMN 351 have been reported. It is identified solely by its developmental code name BMN 351 in clinical trial registrations and by the developer, BioMarin Pharmaceutical Inc. Patients and researchers should refer to it by this name when searching for trial information.

What is the enrollment and design of BMN 351 trials?

The Phase 1/2 trial NCT06280209 has a planned enrollment of 18 male participants with Duchenne Muscular Dystrophy. It is a controlled, open-label study that is not randomized or double-blinded. The extension study NCT07573631 also enrolls 18 participants and is open-label. Both trials are conducted in Italy, Netherlands, Spain, Turkey, and the United Kingdom.