CD4 and acute lymphoblastic leukemia: A significant increase was found in B-ALL group compared to the control group for the cell frequency of the following populations: total lymphocytes (p = 0.0136), CD4 + T-cells (p = 0.0418), CD8 + T-cells (p = 0.0498), and in the “other B-cells” subset (p = 0.0264).