After the FDA request, Cambridge, Massachusetts-based Sarepta said in a statement that it will continue to ship the therapy to ambulatory people but maintain a halt it implemented June 15 for non-ambulatory patients after reporting to the FDA a case of acute liver failure in a patient who could not walk.

Sarepta Therapeutics ( NASDAQ: SRPT) faces an “arduous and treacherous path” to bring its gene therapy Elevidys back to market, according to a STAT report citing a senior FDA official, suggesting the treatment’s license could be revoked amid ongoing safety concerns.

The FDA has placed multiple investigational gene therapy clinical trials on hold, signaling broader platform concerns.