PDCD1 and neoplasm: Correlation analysis revealed that UVRAG had a positive correlation with tumor differentiation (p = 0.016), distant metastasis (p < 0.01), TNM stages (p = 0.008), PD-1 expression (p = 0.041), PD-L1 expression (p = 0.000), and PD-L2 expression (p = 0.000).