CD8A and hepatocellular carcinoma: As shown in Figure 2(c), compared to the high-expression group, the PTEN low-expression group had much higher scores in some immune cells, especially CD8 T cells, Natural Killer (NK) cells, B cells, and macrophages, which can activate the antitumor immunity and revive the tumor-killing capability in the HCC tumor microenvironment [32, 33].