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

study id #: NCT03362502

condition: Duchenne Muscular Dystrophy

status: recruiting

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 subjects with Duchenne muscular dystrophy (DMD). Other objectives include measurement of dystrophin expression and distribution, and assessments of muscle strength, quality, and function.

Two dose cohorts are planned with up to 6 subjects for each. In order to mitigate unanticipated risks to subject safety, enrollment will be staggered within and between the two cohorts and will include a formal review by an external data monitoring committee (E-DMC) prior to dose progression.

intervention: PF-06939926

mechanism of action: Gene therapy to introduce a version of dystrophin

results: https://clinicaltrials.gov/ct2/show/results/NCT03362502

last updated: May 15, 2019

start date: January 23, 2018

estimated completion: June 13, 2020

phase of development: Phase 1

size / enrollment: 12

primary outcomes:

• Incidence of dose-limiting safety or intolerability, as measured by treatment-related adverse events [ Time Frame: through 1 year post-treatment ]

secondary outcomes:

• Evidence of mini-dystrophin expression and distribution assessed by immunohistochemistry, western blot, and/or LC-MS using upper limb muscle biopsies [ Time Frame: at baseline, 2 months and 1 year post-treatment ]
  
• Incidence, severity and causal relationship of treatment-emergent adverse events [ Time Frame: through 5 years post-treatment ]
  
• Incidence and magnitude of abnormal laboratory findings [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in physical and neurological examinations [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in body weight [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in vital signs [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes on electrocardiogram (ECG) [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in body weight and vital signs [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in cardiac MRI-measured left ventricular ejection fraction (LVEF) [ Time Frame: through 5 years post-treatment ]
  
• Incidence and severity of abnormal and clinical relevant changes in Columbia Suicide Severity Rating Scale (C-SSRS) [ Time Frame: through 5 years post-treatment ]

inclusion criteria:
• Diagnosis of Duchenne muscular dystrophy confirmed by medical history and genetic testing
• Body weight between 15 and 50 kg
• Receipt of glucocorticoids for 6 months and a stable daily dose for at least 3 months prior to study entry
• Ability to rise from floor within seven (7) seconds and ability to walk
• 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

exclusion criteria:
• Receipt of live attenuated vaccination within 3 months prior or exposure to a 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 and missense 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) or pre-existing anti-dystrophin T-cell response
• Compromised cardiac function as indicated by a left ventricular ejection fraction of less than 55% on cardiac MRI
• Inadequate hepatic or renal function or risk factors for autoimmune disease on screening laboratory assessments.

sponsor: Pfizer

investigators: Pfizer CT.gov Call Center

locations: United States