Follow-up Study After 11 Years of Patients Who Were Included in the BENEFIT Trial (304747) With a First Demyelinating Event Suggestive of Multiple Sclerosis

This study assesses clinical and imaging long-term data, after early or delayed interferon-beta-1b treatment in patients with a first demyelinating event suggestive of multiple sclerosis (MS), 11 years after enrollment in the Betaferon/Betaseron in Newly Emerging Multiple Sclerosis for Initial Treatment (BENEFIT) study (304747). The main objectives are to describe the disease course, change in disability, cognitive function, resource use and employment status, in relation to Interferon beta-1b in the long term.