OUTLINE: Patients receive total body irradiation in a single fraction on day -1. Tacrolimus is given orally twice per day on days -1 to 50. Mycophenolate mofetil is given orally on day 0 and twice per day on days 1 to 28. Patients receive donor bone marrow infusion on day 0. Patients are evaluated on days 56, 180, 292, and 365. If there is donor engraftment, donor chimerism is less than 80%, there is no active graft-versus-host disease, no disease progression, less than 50% decrease in donor cell chimerism from last measurement, and the patient is not taking immunosuppressive agents, then donor leukocyte infusions are administered on days 70, 194, and 306. Patients are followed annually for 5 years.