- Failure to respond or intolerance to the currently available Multiple Sclerosis (MS) immunomodulatory treatments (ie interferons, Copaxone, immunosuppression): the lack of response to these treatments will be determined/defined by either an increase (deterioration) of at least one degree in the Expanded Disability Status Scale (EDSS) score during the last year or the appearance of at least two major relapses of MS during the same period of time (under treatment) or intolerance to these agents.