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Kaplan-Meier survival curve. A: Kaplan-Meier survival curve of perihilar cholangiocarcinoma; B: Kaplan-Meier survival curve of perihilar cholangiocarcinoma according to residual tumor status; C: Kaplan-Meier survival curve of perihilar cholangiocarcinoma according to lymph node metastasis; D: Kaplan-Meier survival curve of perihilar cholangiocarcinoma according to residual tumor status and lymph node metastasis.
