A Study to Evaluate the Safety and Tolerability of PF-06939926 Gene Therapy in Duchenne Muscular Dystrophy

Stopped early · Phase 1

Conditions studied: Duchenne Muscular Dystrophy

In brief

This is a first-in-human/first-in-patient, multi-center, open-label, non-randomized, ascending dose, safety and tolerability study of a single intravenous infusion of PF-06939926 in ambulatory and non-ambulatory subjects with Duchenne muscular dystrophy (DMD). Other objectives include measurement of dystrophin expression and distribution, and assessments of muscle strength, quality, and function. A total of approximately 22 subjects will receive PF-06939926, and these will include both ambulatory and non-ambulatory subjects. Up to 13 subjects may be included in a cohort that includes the concomitant medication, sirolimus. In order to mitigate unanticipated risks to subject safety, enrollment will be staggered within and between two planned dose-levels and will include a formal review by an external data monitoring committee (E-DMC) prior to dose progression.

Key facts

Study ID: NCT03362502
Run by: Pfizer
People needed: 23
Starts: 2018-01-23
Expected to finish: 2025-07-28
Last updated by the study team: 2025-09-15

Who can join

Age: 4 and older. Sex: male. Healthy volunteers: not accepted.

You may qualify if…

Age as follows, based on ambulatory status:
FOR AMBULATORY PARTICIPANTS, defined as the ability to walk at least 10 meters unassisted: Between 4 and 12 years, inclusive,
FOR NON-AMBULATORY PARTICIPANTS, defined as the inability to walk at least 10 meters unassisted: No age restrictions so long as loss of ambulation occurs prior to the subject's 17th birthday;
Diagnosis of Duchenne muscular dystrophy confirmed by medical history and genetic testing;
Receipt of glucocorticoids for 6 months and a stable daily dose for at least 3 months prior to study entry;
Ability to tolerate magnetic resonance imaging (MRI) without sedation and with no contraindications to these procedures;
Ability to tolerate muscle biopsies under anesthesia with no contraindications to these procedures;
Body weights as follows, based on ambulatory status:
FOR AMBULATORY PARTICIPANTS: Between 15 kg and 50 kg,
FOR NON-AMBULATORY PARTICIPANTS: Less than 75 kg, but which may be managed or adjusted to a lower limit, especially to ensure participant safety;
Functional performance as follows, based on ambulatory status:
FOR AMBULATORY PARTICIPANTS: Ability to rise from floor within seven (7) seconds,
FOR NON-AMBULATORY PARTICIPANTS: Percent predicted forced vital capacity greater than 40% as part of pulmonary function tests, as well as adequate upper limb function.

You may not qualify if…

Receipt of live attenuated vaccination within 3 months prior to receiving PF-06939926 or exposure to an influenza (or other inactivated) vaccination or systemic antiviral and/or interferon therapy within 30 days prior to receipt of PF-06939926;
Prior exposure to any gene therapy agent, including exon-skipping agents;
Exposure to other investigational drugs within 30 days or 5 half-lives, whichever is longer;
Neutralizing antibodies (NAb) against adeno-associated virus, serotype 9 (AAV9);
Compromised cardiac function as indicated by left ventricular ejection fraction on cardiac MRI, as follows, based on ambulatory status:
FOR AMBULATORY PARTICIPANTS: Less than 55%,
FOR NON-AMBULATORY PARTICIPANTS: Less than 35%;
Inadequate hepatic or renal function or risk factors for autoimmune disease on screening laboratory assessments.
The following genetic abnormalities in the dystrophin gene as confirmed by the investigator based on the review of the DMD genetic testing:
Any mutation (exon deletion, exon duplication, insertion, or point mutation) affecting any exon between exon 9 and exon 13, inclusive; OR
A deletion that affects both exon 29 and exon 30.
Sirolimus Cohort
Inclusion Criteria
> 8 years of age Exclusion Criteria
Hypersensitivity to sirolimus or intolerance to soy, including a history of angioedema
Concomitant use with strong CYP3A4/P-gp inducers or inhibitors

Where it is running

MRI Research Center — Los Angeles, California, United States
Reed Neurological Research Center — Los Angeles, California, United States
Ronald Reagan UCLA Medical Center (Investigational Drug Section) — Los Angeles, California, United States
Ronald Reagan UCLA Medical Center - Interventional Radiology — Los Angeles, California, United States
Ronald Reagan UCLA Medical Center Drug Information Center — Los Angeles, California, United States
UCLA (David Geffen School of Medicine) — Los Angeles, California, United States
UCLA Children's Heart Center — Los Angeles, California, United States
UCLA Mattel Children's Hospital — Los Angeles, California, United States
UCLA Medical Center — Los Angeles, California, United States
UCLA Outpatient Surgery Center — Los Angeles, California, United States
Duke Neurology — Durham, North Carolina, United States
Duke University Medical Center, Lenox Baker Children's Hospital — Durham, North Carolina, United States
Biospecimen Repository & Processing Core - BPRC — Durham, North Carolina, United States
Duke Cardiovascular Magnetic Resonance Center — Durham, North Carolina, United States
Duke Children's Hospital & Health Center — Durham, North Carolina, United States
Duke University Hospital Investigational Drug Services (IDS) Pharmacy — Durham, North Carolina, United States
CCTS Clinical Research Center — Salt Lake City, Utah, United States
University of Utah Imaging and Neurosciences Center — Salt Lake City, Utah, United States
University of Utah Hospital & Clinics Investigational Drug Services — Salt Lake City, Utah, United States
University of Utah Hospital — Salt Lake City, Utah, United States
Primary Children's Hospital — Salt Lake City, Utah, United States
University of Utah Clinical Neurosciences Center — Salt Lake City, Utah, United States

Full record on ClinicalTrials.gov

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