Busulfan, Etoposide, and Total-Body Irradiation in Treating Patients Undergoing Donor Stem Cell or Bone Marrow Transplant for Advanced Hematologic Cancer

DISEASE CHARACTERISTICS: * Diagnosis of 1 of the following: * Acute myeloid leukemia (AML) * Failed remission induction therapy or in relapse beyond second remission * In first remission with poor risk cytogenetics (e.g., 11q abnormalities, -7, -5, complex abnormalities \[i.e., \> 3 abnormalities, 6;9 translocation and 3q abnormalities del (7q), del (5q), complex abnormalities ≥ abnormalities, 9q, 20q, 21q, 17q, t(9;21)\]) * Acute lymphoblastic leukemia (ALL) * Failed remission induction therapy or in relapse beyond second remission * Blastic phase chronic myelogenous leukemia * Refractory anemia with excess blasts * Refractory anemia with excess blasts in transformation * HLA -A, -B, -C, -DR identical sibling donor match available * No relapse after prior bone marrow transplantation PATIENT CHARACTERISTICS: * Cardiac ejection fraction ≥ 50% * Serum creatinine ≤ 1.2 times upper limit of normal (ULN) or creatinine clearance \> 80 mL/min * Bilirubin ≤ 1.5 times ULN * AST and ALT \< 5 times ULN * FEV\_1 ≥ 50% of predicted normal * DLCO ≥ 50% of predicted normal * No psychological or medical condition that would preclude allogeneic transplantation (in the opinion of the treating physician) * Not pregnant * Negative pregnancy test PRIOR CONCURRENT THERAPY: * See Disease Characteristics * At least 28 days since prior induction or reinduction therapy * Prior etoposide and busulfan allowed * No prior radiation therapy that would exclude total-body irradi…