DCBLD2 and pancreatic ductal adenocarcinoma: Abbreviations: AUC, area under the curve; CP, chronic pancreatitis; DCBLD2, discoidin, CUB and LCCL domain-containing protein 2; DFS, disease-free survival; GEO, Gene Expression Omnibus; GEPIA, Gene Expression Profiling Interactive Analysis; KEGG, The Kyoto Encyclopedia of Genes and Genomes; K–M, Kaplan-Meier; OS, overall survival; PDAC, pancreatic ductal adenocarcinoma; ROC, receiver operating characteristic; RTK, receptor tyrosine kinase; QRT-PCR, quantitative real-time polymerase chain reaction.