- Patients must have a diagnosis of AML or acute leukemia of ambiguous lineage according to World Health Organization (WHO) classification with >= 5% of disease in bone marrow (BM); patients with blast count < 5% are eligible if immunophenotype, molecular or cytogenetic signature are consistent with AML as determined by primary treating oncologist; patients with extramedullary disease, or biopsy-proven isolated myeloid sarcoma (myeloblastoma, chloroma, including leukemia cutis) are eligible regardless of marrow involvement