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Study overview: A phase 3, multicenter, randomized (2:1), double-blind, sham procedure–controlled trial of the Low Dose Regimen (12 mg loading doses/12 mg maintenance doses)
Study duration: 15 months
Participants: 126 patients with later-onset SMA, aged 2 to 9 years at screening, who had not achieved independent walking
Primary outcome measured: Least-squares mean change from baseline in the HFMSE score at 15 months of treatment
Select secondary outcomes measured: Clinically meaningful change in HFMSE score ≥3 points and change in upper limb function as measured by RULM
Study limitations: Differences in dosing compared with the approved SPINRAZA schedule
Safety: The most common adverse reactions were fever (43%), headache (29%), vomiting (29%), and back pain (25%)
HFMSE, Hammersmith Functional Motor Scale—Expanded; RULM, Revised Upper Limb Module; SMA, spinal muscular atrophy.
Learn more about the mobility measures used in the SPINRAZA clinical trials.
CI, confidence interval.