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Kaplan–Meier curves of overall survival according to metastasis sites in the total cohort and each subtype. AVC, Carcinoma of Vater ampulla; BTC, biliary tract cancer; DCC, Distal cholangiocarcinoma; dLN, Distant lymph node; GBC, Gallbladder cancer; ICC, Intrahepatic cholangiocarcinoma; PHCC, Perihilar cholangiocarcinoma
