
Scholar Rock is positioned to launch apitegromab as the first muscle-targeted therapy for SMA, pending FDA approval by September 30, 2026. Manufacturing setbacks were production-based, not due to drug efficacy or safety; the alternate fill-finish facility mitigates approval risk but does not eliminate it. SAPPHIRE trial data support apitegromab's add-on value in SMA, showing statistically significant motor function gains over placebo for nonambulatory patients.










