Patient death prompts FDA halt on Pfizer’s Duchenne gene therapy study December 21, 2021 Auto Bot BioPharma, biopharma nl, clinical hold, Duchenne muscular dystrophy, FDA, gene therapy, Legal, New York, Pfizer, Pharma 0 The FDA has halted tests of a Pfizer gene therapy for Duchenne muscular dystrophy. The clinical hold is one of several placed on gene therapy tests in the past year due to safety concerns.