NCT00104858 2019-07-11Fludarabine Phosphate, Radiation Therapy, and Rituximab in Treating Patients Who Are Undergoing Donor Stem Cell Transplant Followed by Rituximab for High-Risk Chronic Lymphocytic Leukemia or Small Lymphocytic LymphomaFred Hutchinson Cancer CenterPhase 2 Completed66 enrolled 17 charts