= Fully recruited
= Not yet recruiting
= Enrolling by invitation
This study is a phase 3 trial testing the safety and efficacy of Pfizer's gene therapy construct, PF-06939926. It is delivered using an adeno-associated virus, AAV, and carries a shortened version of the dystrophin gene (mini-dystrophin). The treatment will be given by an intravenous infusion.
Two-thirds of the participants will receive the treatment. One-third will be randomly allocated to the placebo arm, but will be able to receive the treatment in the second year, so long as it remains safe to do so.
Please note that patients will need to be on daily steroids for 3 months before screening, to be eligible. They will also be able to be recruited to the trial up until their 8th birthday. For more information about the recruitment process for gene therapy trials, please click here.
EU Clinical Trial Register number: 2019-002921-31
The study will assess the efficacy of PF-06939926 gene therapy on ambulatory function while also monitoring its safety. Approximately 99 boys with DMD will be enrolled and randomly assigned to one of two groups: approximately two thirds will be in Cohort 1 and receive gene therapy at the start of the study; approximately one third will be in Cohort 2 and receive placebo at the start of the study and receive gene therapy after one year, as long as it remains safe to do so. The treatment (PF-06939926 gene therapy or placebo) will be given as an intravenous infusion lasting up to 2 hours. Participants in the study will remain in a hospital setting where they will be monitored for at least seven days following the infusion.
The study includes boys who are at least 4 years old and less than 8 years old (including 7 year olds up until their 8th birthday). All boys will need to be on a daily dose of glucocorticoids (prednisone, prednisolone, or deflazacort) for at least 3 months prior to enrolling and to stay on daily glucocorticoids for the first 2 years of the study. All boys will need to be negative for neutralizing antibodies against AAV9, as measured by the test done for the study as part of screening.
The primary outcome of the study will be assessed at 52 weeks. All participants will be followed in the study for 5 years after treatment with gene therapy.
The study medication, all medical tests associated with the study, and the visits to the study sites are free of charge. Participants will also be supported for travel costs associated with study visits.
Any of the following genetic abnormalities in the dystrophin gene: