These were the most active stocks ahead of Friday's market open: Sarepta Therapeutics Inc.'s stock tumbled 27% after the company said another patient died following gene-therapy treatment, Bloomberg ...

A third fatality has been recorded among patients receiving treatment with a Sarepta gene therapy, adding to the troubles being faced by the company.

Sarepta Therapeutics Inc. said another patient has died from acute liver failure after receiving one of its gene therapies, ...