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Previous studies reported that a 2- to 3-week course of IV cyclophosphamide plus adrenocorticotropic hormone (ACTH) induction can temporarily halt progressive MS for a period of 12 months in the majority of patients treated, after which reprogression occurs. The Northeast Cooperative Multiple Sclerosis Treatment Group was formed to determine whether outpatient pulse cyclophosphamide therapy could affect reprogression and whether there were differences between a modified induction regimen and the previously published regimen. Two hundred fifty-six progressive MS patients were randomized into four groups to receive IV cyclophosphamide/ACTH via the previously published versus a modified induction regimen, with or without outpatient IV cyclophosphamide boosters (700 mg/m² every other month for 2 years). There were blinded evaluations performed every 6 months. Results demonstrate that (1 …