PDCD1 and hepatocellular carcinoma: By establishing an immune-related lncRNA signature in HCC, it was found that this immune-related lncRNA signature is associated with ICB immunotherapy-related molecules, including IDO1, PD-L1 and PD-L2, as well as infiltration immune cells, including M0 macrophages, Tregs, CD4 memory T cells, and M1 macrophages, and predicted the survival of patients [78], suggesting a close relationship between lncRNAs and the TME, including PD1/PD-L1 pathways.