CD4 and acute myeloid leukemia: The results showed that Tregs from controls or AML patients promoted the apoptosis of normal CD4+CD25− T cells compared with that of CD4+CD25− T cells cultured alone (17.03 ± 1.97% vs. 34.40 ± 2.10%, P = 0.0038; 17.03 ± 1.97% vs. 55.27 ± 3.47%, P = 0.007).