FDA lifts Pfizer gene therapy clinical hold, but trial adds new safety measures April 28, 2022 Auto Bot BioPharma, biopharma nl, Clinical Trials, Duchenne muscular dystrophy, FDA, gene therapy, Legal, Pfizer, Pharma 0 Pfizer now has the regulatory O.K. to resume pivotal tests of its gene therapy for Duchenne muscular dystrophy—but with new limitations and safety measures. The FDA had placed a clinical hold on the study late last year following a patient death.