F9 and hepatocellular carcinoma: The expression of F9 was negatively correlated with the infiltration level of CD4+ T cells (cor = −0.30, p = 2.60e-09), neutrophils (cor = −0.26, p = 5.98e-07), B cells (cor = −0.23, p = 4.99e-06), dendritic cells (cor = −0.23, p = 5.95e-06), macrophages (cor = −0.21, p = 5.58e-05), and CD8+ T cells (cor = −0.11, p = 3.1e-02) in HCC tissues (Figure 11A).