Natalizumab vs interferon beta 1a in relapsing-remitting multiple sclerosis: a head-to-head retrospective study

Background – No head-to-head study has been performed yet to assess whether natalizumab is more effective than classical immunomodulators in multiple sclerosis (MS). Aim – To retrospectively compare the efficacy of natalizumab vs IFN beta 1a SC (44 μg; Rebif®) on clinical and radiological findings in two matched cohorts of patients with MS. Patients and methods – We retrospectively enrolled two cohorts of 42 patients (F/M: 35/7) with relapsing-remitting multiple sclerosis treated with natalizumab or IFN beta 1a for at least 12 consecutive months. Outcome measures were annualized relapse rate (ARR), changes in expanded disability status scale (EDSS) score, and number of contrast-enhancing lesions (CELs) at magnetic resonance imaging (MRI). Results – In both groups, the ARR in the 12 months of treatment was lower than in the 12 months before therapy (0.24 vs 1.50 in natalizumab-treated group, P