In bile samples, WFA-sialylated MUC1 levels (nL/μg protein; median, range) were significantly higher in patients with either BTC or IhCC (27, 10–653) and patients with perihilar CC (24, 10–653), distal CC (29, 10–533), gallbladder carcinoma (25, 11–341), and IhCC (60, 25–432) than in those with benign biliary tract diseases (7.4, 0.3–45; Table 2). Here, MUC1 is linked to gallbladder carcinoma.