PDCD1 and neoplasm: Results revealed that GLUT1 expression positively correlated with PD-L1 (P value=1.59e-02) and negatively correlated with PD-1 (P value=1.36e-02) in PAAD, and no significance was observed between GLUT1 expression and CTLA-4 expression after adjustment for tumor purity (Figure 7A-C).