Effect of Evobrutinib on Slowly Expanding Lesion Volume in Relapsing Multiple Sclerosis

Chronic active lesions (CALs) are demyelinated multiple sclerosis (MS) lesions with ongoing microglia/macrophage activity, resulting in irreversible neuronal damage and axonal loss. Evobrutinib is a highly selective, covalent, CNS-penetrant, Bruton tyrosine kinase inhibitor. This post hoc analysis evaluated the effect of evobrutinib on slowly expanding lesion (SEL) volume, an MRI marker of CALs, assessed baseline–week 48 in a phase 2, double-blind, randomized trial (NCT02975349) in relapsing MS (RMS).