Spinal Muscular Atrophy Functional Composite Score Revised (SMA-FCR) in Untreated and Nusinersen-Treated Patient Cohorts

The SMA-FCR broadens the spectrum of abilities captured in SMA. Analyses of the treated-untreated differences in mean annual rate of change suggest that the SMA-FCR may be more sensitive to change than the HFMSE. The use of the SMA-FCR in clinical trials might allow for study designs with broader eligibility criteria including weaker individuals who score minimally on the HFMSE and stronger individuals who score maximally on the RULM.