This study is designed to investigate the treatment effect of ocrelizumab compared with placebo on clinical and radiological outcomes in patients with RIS (i.e., asymptomatic CNS lesions fulfilling the 2017 McDonald criteria for DIS), as well as neuroimaging, serologic, immunologic and other exploratory biomarkers of MS disease biology in order to improve the understanding of B cell biology in early disease pathophysiology, characterize the emergence of CNS autoimmunity, and the mechanism of action of ocrelizumab in this population.
This is a multicenter, randomized, double-blind, placebo-controlled, Phase 4 study in which eligible patients with RADIOLOGICALLY ISOLATED SYNDROME (RIS) (as defined by meeting 2017 McDonald criteria for DIS) will be randomized 1:1 to receive ocrelizumab treatment or placebo (standard of care).