Patients will remain in the hospital for about 4-6 weeks. After discharge, patients will continue as outpatients in the hospital area until they are able to safely leave the immediate hospital area or for a minimum of 100 days after the transplant. Some patients may need to receive spinal taps with instillation of cytosine arabinoside and hydrocortisone several times over the year after transplantation. This is only for patients with a previous clinical history of leukemic involvement of the brain.