Prognostic value of lymphadenectomy for long-term outcomes in node-negative intrahepatic cholangiocarcinoma: A multicenter study

Background: Lymphadenectomy ensures accurate staging for patients with intrahepatic cholangiocarcinoma, especially for those without preoperatively suspected positive lymph nodes (clinically node-negative); however, its prognostic value has been poorly documented. The aim of this study was to evaluate the prognostic value of lymphadenectomy on long-term outcomes in patients undergoing surgery for clinically node-negative intrahepatic cholangiocarcinoma. Methods: Data from all patients who underwent liver resection with or without lymphadenectomy for preoperatively diagnosed intrahepatic cholangiocarcinoma between 2000 and 2016 at 3 tertiary hepatobiliary centers were analyzed retrospectively. Propensity score matching in a 1:1 ratio was conducted based on clinically relevant covariates between patients with clinically node-negative intrahepatic cholangiocarcinoma who underwent liver resection with (LND group) and without (NLND group) lymphadenectomy. Overall survival and disease-free survival were compared in the matched cohort. Results: Among 350 patients who underwent surgery during the study period, 192 (55%) with clinically node-negative intrahepatic cholangiocarcinoma met the inclusion criteria. After propensity score matching, 2 well-balanced groups of 56 patients each were analyzed. There was no significant difference regarding postoperative variables among these 112 matched patients. Patients who underwent a liver resection with lymphadenectomy achieved better 3- and 5-year overall survival (78% and 65% vs 52% and 46%, P =.017) and disease-free survival (46% and 34% vs 31% and 31%; P =.042) compared with patients who underwent liver resection without lymphadenectomy. Conclusion: Lymphadenectomy can be associated with better long-term outcomes in patients with node-negative intrahepatic cholangiocarcinoma. Our data may support routine lymphadenectomy for node-negative intrahepatic cholangiocarcinoma with the objective of achieving better long-term outcomes.