The death of a young boy with Duchenne muscular dystrophy (DMD) who was treated with Pfizer’s experimental gene therapy in a phase 2 trial has prompted the company to pause dosing in another study.

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“It is clear the next nominee will face a major confirmation battle,” Tony Perkins, president of the Family Research Council, wrote on Sept. 30. “If there is going to be a fight, it needs to be a ...