CD4 and hepatocellular carcinoma: Because the proportions of CD4+CD25+FOXP3+ Treg cells and CD4+IL-17+ Th17 cells were markedly higher in the stage III-IV group than in the stage I-II group, we used Spearman correlation analysis to study the correlation between Treg and Th17 cells in the peripheral blood of patients in the HCC group.