In addition, the PD-L1/PD-1 axis genes were strongly correlated with each other, whereas the Th1 and Th2 scores were weakly correlated (Figure 1B), suggesting that the Th1 and Th2 scores in GBM are correlated with the expression of genes in the PD-L1/PD-1 axis in a complex manner. Here, PDCD1 is linked to glioblastoma.