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Plasma miR‐21 expression levels in each type of cancer. Bile duct cancer (BDC; n = 48), intrahepatic cholangiocarcinoma (ICC; n = 21), gallbladder cancer (GBC; n = 14), and ampulla vater cancer (APC; n = 11). Plasma miR‐21 levels in patients with each cancer type were also significantly higher than in patients with benign biliary disease (BBD)or in healthy volunteers (HVs). *P < 0.05.
