PDCD1LG2 and hepatocellular carcinoma: To analyze the correlation between immune cell infiltration and PD-Ls expression in HCC, the abundance of tissue-infiltrating immune and non-immune stromal cell populations in patients with different expression of PD-Ls (PD-L1 low vs. high; PD-L2 low vs. high) were evaluated by using the R package MCPcounter [Supplementary Materials; (53)].