CXCL8 and atrial fibrillation: The AUCs of AF APRIL, IL-8, MIP-1α, S100 A8/A9, and TIMP-1 were not significantly different (all variables: P=0.052–0.787), except for the AUC of AF S100 A8/A9, which was significantly greater than that of AF MIP-1α (P=0.023).