Relapsing-Remitting Multiple Sclerosis Clinical Trial
Official title:
MRI and Clinical Disease Activity in Patients Treated Long Term With Natalizumab
The primary objective of the study is to retrospectively investigate the proportion of participants free of new or enlarging fluid-attenuated inversion recovery (FLAIR) lesions over time in approximately 300 Relapsing-Remitting Multiple Sclerosis (RRMS) participants with regular MRI follow-up, who have received natalizumab ≥24 month from two different observational cohorts: 1) approximately 230 participants from the Czech Republic; and 2) approximately 70 participants from Belgium. The secondary objectives of this study are as follows: Brain volume change by various measures; Changes in the number and volume of magnetic resonance imaging (MRI) lesions; No evidence of disease activity (NEDA) with and without brain volume change.
Natalizumab will not be provided to participants by Biogen as a part of this study. Participants will remain on natalizumab therapy as prescribed by their physician. ;
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