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. The gene discussed is CTLA4; the disease is pancreatic adenocarcinoma.