The United States Food and Drug Administration (FDA) has granted “Breakthrough Therapy Designation” for ocrelizumab, an experimental medication presently under investigation for the treatment of primary-progressive multiple sclerosis (PPMS). At this time, no treatments are available for this less-common form of MS. With this designation, the FDA affirms: (1) the medication would be used to treat a serious condition; (2) preliminary clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies; and (3) the review process would be expedited to within 60 days.