Patients randomized to ACTH treatment will be given ACTH for 12 months. During the second 6 months, the ACTH dose will be reduced to 50% of the starting dose. The outcome of interest is the presence of relapses after dose reduction. Follow-up will occur throughout the 12 months of therapy, and also for 6 months following the completion of ACTH therapy. The outcome of interest is the percentage of patients with relapses in the 6 months after completing a 12 month course of ACTH treatment.