In order to further analyze the association between ceRNA risk scores and immune checkpoint genes, we first compared differential expression of the eight immune checkpoint genes (CD274, CTLA4, HAVCR2, LAG3, PDCD1, PDCD1LG2, SIGLEC15, and TIGIT) in PAAD samples and normal samples. This evidence concerns the gene PDCD1LG2 and pancreatic adenocarcinoma.