Among them, nine genes showed the strongest positive expression correlations with the enrichment levels of CD8+ T cells in HCC (r > 0.9), including SLAMF6, COR O 1A, CD6, SIT1, SASH3, CD2, PTPN7, CD3E, and LCK (Figure 2A). This evidence concerns the gene LCK and hepatocellular carcinoma.