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SRP-1001

Phase 1

Muscular Dystrophy, Facioscapulohumeral | Small molecule | Neurology |Arrowhead Pharmaceuticals, Inc.|Trials Updated: Oct 5, 2026

SRP-1001 target and mechanism

Molecular targetDUX4
ModalitySmall molecule

Also known as SRP-1001 for Injection

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment60

FDA Designations

No designations recorded

SRP-1001 clinical trials

SRP-1001 · 1 trial · 1 indication

Phase 1 1
NCT06131983Study of SRP-1001 in Adult and Adolescent Participants With Facioscapulohumeral Muscular Dystrophy Type 1Muscular Dystrophy, Facioscapulohumeral
ENROLLING BY_INVITATION60 Analytics
PHASE1ENROLLING BY_INVITATION
Study of SRP-1001 in Adult and Adolescent Participants With Facioscapulohumeral Muscular Dystrophy Type 1
Muscular Dystrophy, FacioscapulohumeralUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment-Emergent Adverse Events Over Time Through End of Study
Part 1: Up to Day 90; Part 2: Up to Day 360

Secondary Endpoints

PK of SRP-1001: Maximum Observed Plasma Concentration (Cmax)
Part 1: through 48 hours post-dose (all cohorts) and through 48 hours post second dose (Cohorts 3 & 4 only); Part 2: through 8 hours post first and second dose
PK of SRP-1001: Area Under the Plasma Concentration Versus Time Curve from Zero to 24 Hours (AUC0-24)
Part 1: through 48 hours post-dose (all cohorts) and through 48 hours post second dose (Cohorts 3 & 4 only); Part 2: through 8 hours post first and second dose
PK of SRP-1001: Area Under the Plasma Concentration Versus Time Curve from Zero to the Last Quantifiable Plasma Concentration (AUClast)
Part 1: through 48 hours post-dose (all cohorts) and through 48 hours post second dose (Cohorts 3 & 4 only); Part 2: through 8 hours post first and second dose
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
SRP-1001EXPERIMENTALSRP-1001 for injection
PlaceboPLACEBO_COMPARATORSodium chloride (0.9%)

Interventions

NameTypeDescription
SRP-1001 for InjectionDRUGSingle or multiple doses of SRP-1001 by intravenous (IV) infusion
PlaceboDRUGCalculated volume to match active treatment by IV infusion
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Eligibility Criteria

Age Range16 Years to 70 Years
SexALL
Healthy VolunteersNo
Study Sites16

Key Inclusion Criteria: * Genetically confirmed FSHD1 based on screening evaluation or source verifiable medical record * Clinical severity score between 3 and 8 (scale, 0 to 10) * Must have an eligible lower extremity muscle for biopsy as determined from MRI by a central reader, with muscle fat fr...

Countries:AustraliaCanadaGermanyItalyNetherlandsNew ZealandSpain
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Recent Changes (Last 90 Days)

LOWOct 5, 2026NCT06131983Status: RECRUITING → ENROLLING_BY_INVITATION
LOWOct 5, 2026NCT06131983Status: RECRUITING → ENROLLING_BY_INVITATION
MEDIUMAug 11, 2026NCT06131983primaryCompletionDate: changed
MEDIUMAug 11, 2026NCT06131983primaryCompletionDate: changed

Frequently asked questions about SRP-1001

What is SRP-1001 used for?

SRP-1001 is an investigational therapy being developed for facioscapulohumeral muscular dystrophy, a form of muscular dystrophy. It is in Phase 1 clinical development and is not approved for any indication. The program is led by Arrowhead Pharmaceuticals, Inc. (ticker: ARWR).

What does SRP-1001 target?

SRP-1001 targets DUX4, the gene whose abnormal expression drives facioscapulohumeral muscular dystrophy. By targeting DUX4, the therapy aims to address the underlying cause of the disease. SRP-1001 is a small molecule in Phase 1 development for this condition.

Who is developing SRP-1001?

SRP-1001 is being developed by Arrowhead Pharmaceuticals, Inc., which trades under the ticker ARWR. The company is running a Phase 1 trial of SRP-1001 in facioscapulohumeral muscular dystrophy. No other developers are listed for this asset.

What phase is SRP-1001 in?

SRP-1001 is in Phase 1 clinical development. It is investigational and has not been approved by the FDA or any other regulatory agency. The Phase 1 trial is currently enrolling by invitation and has an estimated enrollment of 60 participants.

What clinical trials is SRP-1001 in?

SRP-1001 is being studied in one active Phase 1 trial, NCT06131983, titled Study of SRP-1001 in Adult and Adolescent Participants With Facioscapulohumeral Muscular Dystrophy Type 1. The trial is enrolling by invitation at sites in Australia, Canada, Germany, Italy, the Netherlands, New Zealand, and Spain.

Is SRP-1001 the same as SRP-1001 for Injection?

Yes, SRP-1001 for Injection is an alternative name for SRP-1001. Both refer to the same investigational small molecule developed by Arrowhead Pharmaceuticals for facioscapulohumeral muscular dystrophy. Searches for either name point to the same Phase 1 program.