GSTM1 and acute myelomonocytic leukemia M4: Hb: hemoglobin; ANC: absolute neutrophil count; MRD: measurable residual disease; CR: complete remission; CNV: copy-number variation; neg: negative; MPAL: mixed-phenotype acute leukemia; AML-M4: acute myelomonocytic leukemia; Hyper-CVAD: hyperfractionated cyclophosphamide, vincristine, doxorubicin, and dexamethasone; FISH: fluorescence in situ hybridization