The result displayed in Fig. 1D revealed that the expression of FTH has significantly positive correlation with B cells (r = 0.272, P = 2.95e−07), CD8 + T cells (r = 0.175, P = 1.13e−03), CD4 + T cells (r = 0.166, P = 2.05e−03), macrophages (r = 0.306, P = 7.7e−09), neutrophils (r = 0.199, P = 1.93e−04), and dendritic cells (r = 0.256, P = 1.76e−06) in HCC. This evidence concerns the gene CD8A and hepatocellular carcinoma.