CD4 and acquired polycythemia vera: After DAPT treatment, the percentage of Th17 cells in cultured CD4+ T cells of PV patients was obviously decreased in a dose-dependent manner (F = 121.160, P < 0.01, Figure 5(a)), while there was no significant difference in the percentage of Treg cells (F = 1.093, P > 0.05, Figure 5(b)), and then the increased ratio of Th17/Treg was gradually restored with the increased concentration of DAPT (F = 44.496, P < 0.01, Figure 5(c)).