Study of Alemtuzumab in Treatment Refractory MS Subjects/Alemtuzumab Naive & Alemtuzumab Experienced Subjects

Hypothesis Alemtuzumab manifests efficacy (e.g. improved MS Severity score, and treatment stability in relapse rate and Expanded Disability Status Scale \[EDSS\] progression) and serious adverse events (SAEs) equivalent or better than standard of care treatment strategies used prior to treatment for treatment-refractory multiple sclerosis. Objectives Treat prospectively documented clinic patients treatment-refractory multiple sclerosis that are naïve to alemtuzumab. Obtain retrospective disability, relapse, and adverse events in alemtuzumab-experienced subjects previously treated outside of clinical trial settings for treatment-refractory MS. Obtain prospective safety and efficacy data for multiple sclerosis symptoms, disability, and adverse effects following the use of alemtuzumab for treatment-refractory MS in a population with exposures to prior cytotoxic and monoclonal antibody therapy. Transition alemtuzumab-experienced clinic patients into a clinical trial setting for additional treatment with alemtuzumab as needed for refractory MS. Coprimary outcomes will be: change in EDSS and converted EDSS to MS Severity scale. Secondary outcomes: changes in annualized relapse rate, days of high dose corticosteroids, MRI-based cerebral volumes and burden of disease (in selected subjects), serious adverse events, and corticosteroid use. A questionnaire will be used to assess patient satisfaction with alemtuzumab as compared to prior therapies. Safety outcomes will be assessed and tabulated.