Laura Airas, MD, PhD, Turku University Hospital, University of Turku, Turku, Finland, describes a study evaluating the impact of natalizumab treatment on innate immune cell activation at chronic lesion edge using an 18-kDa translocator protein-targeting positron emission tomography (TSPO-PET)-imaging. A total of 10 patients with multiple sclerosis (MS) underwent PET-imaging and conventional MR-imaging before and after 1-year treatment with natalizumab. For comparison, 10 MS patients with no disease-modifying therapy were scanned similarly. The findings showed that the proportions of lesion types were unaltered during a one-year follow-up in both groups. Still, the ratio of active voxels at the chronic active lesion rim was reduced more in the natalizumab-treated group compared to the untreated cohort. This interview took place at the Americas Committee for Treatment and Research in Multiple Sclerosis (ACTRIMS) Forum 2023 in San Diego, CA.
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