Nonmyeloablative Allo Stem Cell Transplant for Severe Autoimmune Diseases

Prior to receiving Campath-1H, patients will be premedicated with Benadryl 50 mg IV or PO, and acetaminophen 650 mg orally. Hydrocortisone 100 mg IV is given on the first day of Campath. The preparative regimen will begin on day -5 and consist of 4 days of daily fludarabine at 30 mg/m2/d infused over 30 minutes, cyclophosphamide 500 mg/m2/d infused over 1 hour, 5 days of Campath-1H at 20 mg/d in 250 ml of D5 normal saline or normal saline infused over 3 hours. The mixed dosage of chemotherapy may be rounded off to within +/- 5% of the calculated dose, and doses of fludarabine and cyclophosphamide will be based on adjusted ideal body weight. IV hydration and diuretics will be used to maintain adequate urine output during and after administration of cyclophosphamide.