PDCD1 and hepatocellular carcinoma: We also compared the prediction effect between the other factors, such as AFP (Supplementary Figure 1A) and programmed cell death protein 1 (PDCD1) (Supplementary Figure 3B), whereas AFP is not a good predictor of the abundance of immune invasion in HCC tissues, and PDCD1 is weakly correlated with the prognosis of HCC.