OUTLINE: This is a multicenter study. Patients are assigned to 1 of 2 groups (high-risk vs low-risk hematologic malignancy). The high-risk group includes acute myelogenous leukemia, myelodysplastic syndromes, accelerated phase chronic myelogenous leukemia (CML), second chronic phase CML, and non-Hodgkin's lymphoma. The low-risk group includes Hodgkin's lymphoma, first chronic phase CML, multiple myeloma, and chronic lymphocytic leukemia.