[Examination of Cases of Hepatectomy for Metastatic Colorectal Cancer].

OBJECTIVES:Resection of liver metastasis from colorectal cancer is known to improve prognosis; therefore, surgical treatment is recommended for resectable metastases in the Japanese Society for Cancer of the Colon and Rectum Guidelines for the Treatment of Colorectal Cancer. In this study, we investigated factors that affect the prognosis of resection of such metastatic liver tumors. RESULTS:Thirty-three cases of liver resection performed during the period from 1998 to 2017 were investigated. The 5-year overall survival rate after liver resection was 47.3%, and the 5-year recurrence-free survival rate after liver resection was 29.9%. Univariate analysis identified CA19-9(p=0.02)and operative procedure(p=0.0046)as prognostic factors, while multivariate analysis revealed operative procedure(p=0.03)to be a prognostic factor. When prognosis was examined in terms of operative procedure(ie, lobectomy, segmental resection, or partial resection), the prognosis of patients undergoing lobectomy was significantly poorer compared to those undergoing segmental resection(p=0.0092, RR=28.94)and partial resection(p=0.0092, RR=25.37). CONCLUSION:In this study, operative procedure was identified as a poor prognostic factor. The prognosis of liver metastasis requiring lobectomy is considered to be poor. Further accumulation of cases is needed to investigate the effects of other factors in the choice of operative procedure.