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Scholar Rock SMA Drug Approved by FDA

The approval gives patients a new muscle-targeted option after prior therapies improved survival but left motor function gains limited, company executives said.

  • On Friday, the FDA approved Scholar Rock's Isembyld, the first muscle-targeted treatment for spinal muscular atrophy. Cure SMA president And Kenneth Hobby noted the clearance grants access to a "broad population" of patients.
  • The FDA rejected Isembyld last September due to manufacturing issues at a fill-finish facility. Scholar Rock spent the last year developing an alternative production plan and securing a new facility that met FDA standards.
  • On Monday, Scholar Rock set the list price at $11,659 per single-use vial, with typical annual costs around $310,000. The drug targets the 10,000 to 25,000 people in the U.S. impacted by SMA.
  • Leerink Partners analyst Basma Radwan called a prescribing warning about bone fractures "unexpected," as fractures had not previously been disclosed. However, the side effects affected only patients with pre-existing risk factors and did not stop treatment.
  • Analysts at Leerink Partners project Isembyld could generate around $2 billion in peak annual sales. Scholar Rock also received a priority review voucher, a valuable asset that can accelerate future drug evaluations.
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Seeking Alpha broke the news in Ra'anana, Israel on Sunday, September 13, 2026.
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