Treatment of progressive multiple sclerosis with pulse cyclophosphamide/methylprednisolone: response to therapy is linked to the duration of progressive disease. Hohol MJ, Olek MJ, Orav EJ, Stazzone L, Hafler DA, Khoury SJ, Dawson DM, Weiner HL Mult Scler. 1999 Dec; 5(6):403-9. PMID: 10618696. Abstract CommentRecommendBookmarkWatch