5 questions on Sarepta, the FDA and a Duchenne gene therapy crisis

One month ago, a 51-year-old man treated in a clinical trial with an experimental gene therapy became dangerously sick. The developer of that treatment, Sarepta Therapeutics, informed the Food and Drug Administration his case could be life-threatening. 

The man died from acute liver failure a few weeks later, which Sarepta reported to the FDA on July 3 as a matter of course. Little has seemed to go by the book since. 

Liver injury is a known risk of the kind of gene therapy used to treat the man, who had a muscle-weakening disease called limb-girdle muscular dystrophy. Two other patients with a different kind of muscular dystrophy, Duchenne, and treated with a different Sarepta gene therapy, approved as Elevidys, also died of liver failure this year. In response to those earlier deaths, Sarepta stopped shipping Elevidys to certain older Duchenne patients. 

But Sarepta didn’t consider the 51-year-old man’s death to be “material,” a regulatory term describing when an event is important enough to require public disclosure. The death went unreported publicly until July 17, one day after Sarepta had held...