CD7 and acute myeloid leukemia: The panel design was based on literature data, cluster of differentiation (CD) markers incorporated in our single-center study were the following: CD45 a protein tyrosine phosphatase exclusively expressed on all nucleated cells of the hematopoietic system, we used CD19 to exclude B-cells from the analysis (11), CD3 is a part of the T-cell- and pre-T-cell receptors (12), CD7 is expressed by the leukemic blasts and malignant progenitor cells of approximately 30% in AML patients, but it is absent on the surface of normal myeloid and erythroid cells.