Multivariate analysis showed that elevated plasma FGL-1 (p < 0.01) and PCT levels (p < 0.05) within 72 h after the onset of AP were positively correlated with the severity of AP, while increased plasma FGL-1 (p < 0.01) and CRP (p < 0.05) levels were positively correlated with the occurrence of IPN. Here, FGL1 is linked to bile duct papillary neoplasm.