Long‐term and perioperative outcomes of laparoscopic versus open liver resection for colorectal liver metastases with propensity score matching: a multi‐institutional Japanese study

Background The aim of the present study was to clarify the surgical outcome and long‐term prognosis of laparoscopic liver resection (LLR) compared with conventional open liver resection (OLR) in patients with colorectal liver metastases (CRLM). Methods A one‐to‐two propensity score matching (PSM) analysis was applied. Covariates ( P < 0.2) used for PSM estimation included preoperative levels of CEA and CA19‐9; primary tumor differentiation;...