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PF-06939926

Phase 3

Duchenne Muscular Dystrophy | Gene therapy | Neurology |Pfizer, Inc.|Last Updated: Jul 22, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials1
Total Enrollment114

FDA Designations

No designations recorded

Clinical trial landscape

PF-06939926 · 1 trial · 1 indication

Phase 3 1
NCT04281485Study to Evaluate the Safety and Efficacy of PF-06939926 for the Treatment of Duchenne Muscular DystrophyDuchenne Muscular Dystrophy
ACTIVE NOT_RECRUITING114 Analytics
PHASE3ACTIVE NOT_RECRUITING
Study to Evaluate the Safety and Efficacy of PF-06939926 for the Treatment of Duchenne Muscular Dystrophy
Duchenne Muscular DystrophyUnlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline in North Star Ambulatory Assessment (NSAA) Total Score at Week 52
Baseline, Week 52

The NSAA was a 17-item test that graded performance of various functional skills using the following scale: 0 (unable to achieve independently), 1 (modified method but achieves goal independent of physical assistance from another), and 2 ("normal"- no obvious modification of activity). Total score was calculated as the sum of all 17 individual item responses and ranged from 0 (worst) to 34 (fully independent function) with higher scores indicating better function. Baseline NSAA total score is defined as the last non-missing NSAA total score collected prior to Year 1 drug administration.

Secondary Endpoints

Change From Baseline in Percent Normal Dystrophin Expression Level in Muscle Biopsies by Liquid Chromatography Mass Spectrometry (LC-MS) Based on LLQV Peptide at Week 52
Baseline, Week 52
Change From Baseline in Percent of Muscle Fibers Expressing Mini-Dystrophin in Muscle Biopsies by Immunofluorescence at Week 52
Baseline, Week 52
Change From Baseline in Serum Creatine Kinase (CK) Concentration at Week 52
Baseline, Week 52
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1OTHERApproximately two thirds of participants will be randomized to Cohort 1.
Cohort 2OTHERApproximately one third of participants will be randomized to Cohort 2.

Interventions

NameTypeDescription
PF-06939926GENETICPF-06939926 will be administered as a single IV infusion at Year 1 for Cohort 1.
PlaceboOTHERPlacebo will be administered as a single IV infusion at Year 1 for Cohort 2.
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Eligibility Criteria

Age Range4 Years to 7 Years
SexMALE
Healthy VolunteersNo
Study Sites53

Key inclusion criteria: 1. Confirmed diagnosis of Duchenne muscular dystrophy by prior genetic testing 2. Receiving a stable daily dose (at least 0.5 mg/kg/day prednisone or prednisolone, or at least 0.75 mg/kg/day deflazacort) for at least 3 months prior to Screening 3. Ambulatory, as assessed by ...

Countries:United StatesAustraliaBelgiumCanadaFranceGermanyIsraelItalyJapanRussiaSouth KoreaSpainSwitzerlandTaiwanUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJul 22, 2026NCT04281485lastUpdatePostDate: changed
LOWJul 22, 2026NCT04281485lastUpdatePostDate: changed

Frequently asked questions about PF-06939926

What is PF-06939926 used for?

PF-06939926 is an investigational gene therapy being developed for the treatment of Duchenne Muscular Dystrophy (DMD), a genetic disorder characterized by progressive muscle degeneration and weakness. It is currently in Phase 3 clinical development and has not been approved by regulatory authorities.

Who makes PF-06939926?

PF-06939926 is being developed by Pfizer, Inc. (NYSE: PFE). The company is conducting a Phase 3 clinical trial to evaluate the safety and efficacy of this gene therapy for Duchenne Muscular Dystrophy.

What phase is PF-06939926 in?

PF-06939926 is currently in Phase 3 clinical development. It is an investigational gene therapy for Duchenne Muscular Dystrophy and has not yet been approved by the FDA or other regulatory agencies. The ongoing Phase 3 trial is active but not recruiting participants.

What clinical trials is PF-06939926 in?

PF-06939926 is being evaluated in a Phase 3 clinical trial with the identifier NCT04281485. This randomized, double-blind, controlled study is assessing the safety and efficacy of the gene therapy in male patients aged 4 years and older with Duchenne Muscular Dystrophy. The trial has an enrollment of 114 participants and is being conducted across multiple countries.

How does PF-06939926 work?

PF-06939926 is a gene therapy designed to deliver a functional version of the dystrophin gene to muscle cells. This approach aims to address the underlying genetic cause of Duchenne Muscular Dystrophy by enabling the production of a shortened but functional dystrophin protein, which is essential for muscle stability.