AlloHCT From Matched Unrelated Donors in Pts w/ Advanced Hematologic Malignancies & Disorders

DISEASE CHARACTERISTICS: * Histologically confirmed hematological or lymphatic malignancy, including any of the following: * Acute myeloid leukemia * Relapsed or primary refractory disease with \< 10% blasts on peripheral blood smear * In first remission with poor risk factors and molecular prognosis \[i.e., AML with -5, -7, t(6;9), tri8, -11\] (preparative regimen 3 or 4) * Acute lymphocytic leukemia * In second complete remission or higher OR in first remission with poor risk factors, including any of the following (preparative regimen 1 or 2): * BCR/ABL by fluorescence in situ hybridization (FISH) or reverse transcriptase-polymerase chain reaction * t(9;22)(q34;q11) detected by cytogenetics * Chromosomes \< 44 by cytogenetics * DNA index \< 0.81 by flow cytometry * Any rearrangement of chromosome 11 that results in disruption of MLL gene (11q23) by cytogenetics and SER * In first remission with poor risk factors and molecular prognosis \[ALL with Philadelphia chromosome-positive t(9;22), t(4;22), (q34;q11)\] (preparative regimen 3 or 4) * Chronic myelogenous leukemia * In accelerated phase or greater (preparative regimen 1 or 2) * In accelerated or second chronic phase (preparative regimen 3 or 4) * Myelodysplastic syndromes * With deletion of chromosome 7 or short arm of chromosome 5 (preparative regimen 1 or 2) * In high and high-intermediate risk categories (preparative regimen 3 or 4) * Non-…