By the flow cytometric analysis, the blasts expressed partial CD34, CD13, CD117, partial MPO, and partial CD123 with coexpression of the T-lymphoid markers CD2, CD5, CD7, partial CD4, cytoplasmic CD3, partial cytoplasmic TDT, and CD38, suggestive of AML with rare mixed myeloid/T-cell phenotype. The gene discussed is CD5; the disease is acute myeloid leukemia.