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Distribution of prospective biomarkers in patients with extrahepatic bile duct cancer and the control group
a Carcinoembryonic antigen (CEA). Median CEA 0.4 versus 0.6 (1.4 versus 1.8 μg/l) (P < 0.001) Mann-Whitney U test. b Carbohydrate antigen 19-9 (CA19-9). Median CA19-9 2.0 versus 3.9 (7.5 versus 47.0 kU/l) (P < 0.001) Mann-Whitney U test.
