Right and extended-right hepatectomies for unilobar colorectal metastases: Impact of portal vein embolization on long-term outcome and liver recurrence

Background. Portal vein embolization (PVE) is an effective procedure to increas.e the future remnant liver (FRL) before major hepatectomy. A controversial issue is that PVE may stimulate tumor growth and can be associated with poor prognosis after liver resection for colorectal liver metastases (CRLM)..The aim of this study was to evaluate the impact of PVE on long-term survival following major hepatectomy for CRLM. Methods. Between 1998 and 2010, 100 right and extended-right hepatectomies for unilobar, right-sided CRLM were performed. Of the group, 20 patients underwent preoperative PVE (group A). The control patients (group B; 20 patients) were selected by matching with the group A patients. Results. It was found that 25 patients (25/40; 62.5%) had developed tumor recurrence. The rate of global recurrence was not significantly different in groups A and B (65% vs 60%, respectively; P=.744). The specific overall intrahepatic recurrence rate was 42.5% (17 of 40 patients) and was not significantly different in groups A and B (45% vs 40%, respectively; P=. 749). The 5-year overall and disease-free survival rates were similar in groups A and B (42.9% and 33.6% vs 42.1% and 27.7%, respectively). The 5:year specific liver-disease-free survival was 45.3% in group A and 53.5% in group B (P=.572). On multivariate analysis of all 100 hepatectomies, R1 resection (P=.013) was found to be the only independent predictor of liver-disease-free survival. Conclusion. This study showed that PVE did not affect overall survival and specific liver-disease-free survival in patients undergoing right or right-extended hepatectomy for unilobar, right-sided CRLM.