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Distant metastasis mode of each subtype of the BTC. A, proportion of the M1 patients at first diagnosis in each subtype. B, Venn diagrams of the distribution of distant metastatic sites in each subtype. BTC, biliary tract cancer; ICC, Intrahepatic cholangiocarcinoma; PHCC, Perihilar cholangiocarcinoma; GBC, Gallbladder cancer; DCC, Distal cholangiocarcinoma; AVC, Carcinoma of Vater ampulla; dLN, Distant lymph node
