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Performance of carbohydrate antigen 19.9 (CA19.9), periostin (POSTN), CA242, and carcinoembryonic antigen (CEA) in the diagnosis of pancreatic ductal adenocarcinoma (PDAC) as individual biomarkers. Receiver operating characteristic curves to distinguish PDAC early stage from healthy controls (A, B), all PDAC from benign disease (C, D), and PDAC early stage from benign disease (E, F), in the training and validation cohorts, respectively
