Significantly, CCDC6 was positively correlated with the infiltration levels of dendritic cells, resting dendritic cells, M0-macrophages, and resting CD4-memory T cells; but negatively correlated with the infiltration levels of mast cells, resting mast cells, monocytes, resting NK Cells, and naive CD4 T Cells in HCC (Figure 7B, Supplementary Figure 5A). Here, CD4 is linked to hepatocellular carcinoma.