CD33 and acute myeloid leukemia: Flow cytometry analysis revealed that the blasts were positive for cytoplasmic MPOpartial, CD14partial, CD64, CD13, CD33, CD117dim, CD7partial, and HLA-DR; and negative for cytoplasmic and surface CD3, CD10, CD19, cytoplasmic CD22 and CD79a, consistent with AML with monocytic differentiation (Fig. 1I).