Sarepta SRPT announced that the FDA has accepted its efficacy supplement to the biologics license application (BLA), seeking to expand the treatment label for its Duchenne muscular dystrophy (DMD) drug, Elevidys. The FDA has assigned the Priority Review status to the company's Elevidys filing. A filing designated as a Priority Review reduces the review period by four months. A final decision from the regulatory body is expected on Jun 21, 2024.

The therapy was initially approved by the FDA in June 2023 under the accelerated pathway to treat ambulatory pediatric patients aged between four and five years with DMD. Following the accelerated nod, it became the first approved gene therapy for DMD.

The purpose of the efficacy supplement is two-fold. It seeks to expand the labeled indication for Elevidys to treat all DMD patients, irrespective of age and ambulation status. Subject to approval, it will also convert the Elevidys accelerated approval to a traditional approval.

Sarepta also reported that the regulatory body has confirmed that it will not hold any advisory committee meeting to discuss the efficacy supplement to the Elevidys BLA.

The company's stock rose 7.8% on Feb 16 in response to the encouraging news. In the past year, shares of SRPT have gained 8.1% against the industry's 10.6% decline.

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The BLA supplement is mainly supported by data from the phase III EMBARK study, announced in October 2023, which also serves as the confirmatory study for Elevidys' full approval in DMD indication. Though the study failed to achieve its primary endpoint, it gained statistical significance on all pre-specified key secondary endpoints, indicating that treatment with Elevidys modifies the course of DMD indication.

SRPT had discussed the above results with the FDA. Notably, the FDA had previously indicated that the regulatory body is open to reviewing the data for label expansion based on the totality of evidence from the EMBARK study.

Sarepta recently reported encouraging preliminary/unaudited results for the fourth quarter and full-year 2023. Per the company, Elevidys sales are expected to be around $131.3 million for the fourth quarter, bringing the total sales figure to around $200.4 million for the full year. This is an encouraging figure for a treatment that was commercially launched in third-quarter 2023.

SRPT developed Elevidys in collaboration with Roche RHHBY. Sarepta and Roche entered into a licensing agreement in 2019 to develop and commercialize Elevidys jointly. Per the agreement, Roche has exclusive rights to launch and commercialize the gene therapy in ex-U.S. markets. As part of the agreement, SRPT will also record collaboration revenues on the ex-U.S. sales made by RHHBY.