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Pfizer setback brings questions for Duchenne gene therapy ahead of Sarepta decision

June 13, 2024

The failure of a Pfizer medicine for Duchenne muscular dystrophy adds new uncertainty around the effectiveness of gene therapy for the muscle-wasting condition, days before the Food and Drug Administration is expected to decide on expanding use of a similar treatment from Sarepta Therapeutics.

On Wednesday, Pfizer said the treatment missed its mark in a definitive Phase 3 study of boys between 4 and 7 years of age with Duchenne. Pfizer didn’t disclose specifics, but said the therapy didn’t lead to a significant difference versus placebo on a measure of motor function, or on key secondary measures such as timed tests for how quickly study participants could stand or walk. The results will be presented at future medical and patient advocacy meetings.

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