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Performance of periostin (POSTN) and carbohydrate antigen 242 (CA242) in diagnosis of CA19.9‐negative pancreatic ductal adenocarcinoma (PDAC) patients. Receiver operating characteristic curves of POSTN, CA242, and POSTN + CA242 in the training, validation, and whole cohorts. To distinguish PDAC CA19.9‐negative from healthy controls (A‐C), and benign disease (D‐F) in the training, validation, and whole cohorts, respectively
