OUTLINE: Patients receive a preparative regimen consisting of oral busulfan every 6 hours on days -7 through -4 and cyclophosphamide on days -3 and -2. Patients then receive allogeneic bone marrow or peripheral blood stem cells on day 0. Patients registered on protocol FHCRC-1106.00 randomized to stem cell transplant receive unmodified G-CSF-mobilized stem cells from an HLA-identical donor.