Fludarabine add-on therapy in interferon-beta-treated patients with multiple sclerosis experiencing breakthrough disease. Greenberg SJ, Zivadinov R, Lee-Kwen P, Sharma J, Planter M, Umhauer M, Glenister N, Bakshi R Ther Adv Neurol Disord. 2016 Mar; 9(2):105-17. Epub 2016 Jan 21. PMID: 27006698. Abstract CommentRecommendBookmarkWatch