Sarepta Therapeutics is pausing shipments of its gene therapy for muscular dystrophy following several patient deaths that have attracted attention from regulators.

Sarepta Therapeutics shares traded lower in premarket trade on Tuesday, as the drugmaker relented to a Food and Drug Administration request to halt the shipments of a gene therapy.

Sarepta Therapeutics' (SRPT) stock continued to sink Tuesday, down more than 4% in pre-market trade, following a rough end to last week, including a previously unreported patient death in a clinical trial of an unnamed therapy and the threat of the FDA taking a different therapy,