IL6 and bile duct papillary neoplasm: The AUCs for the use of IL-6 for the prediction of OF, PN, IPN, and mortality were 0.72 (95% CI, 0.58–0.85), 0.68 (95% CI, 0.55–0.82), 0.81 (95% CI, 0.69–0.94), and 0.75 (95% CI, 0.52–0.99), respectively.