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[Appropriate Range of Lymph Node Dissection in Elderly Patients with Colorectal Cancer].

In elderly patients, surgical procesure is decided considering the general condition and surgical invasion. The aim of this study was to clarify the appropriate rage of lymph node dissection for elderly colorectal cancer patients. One hundred forty one colorectal cancer patients aged 75 years or more, who underwent R0 colorectal resection with D2 or D3 lymph node dissection in clinical T3/T4 or clinical N+, were enrolled in this study. The patients whose tumor located in the rectum below the peritoneal reflection(Rb)were excluded. Five-year overall survival(OS)rate and disease specific survival(DSS)rate were 79.1% and 89.4%, respectively. More than 2 preoperative co-morbidities and macroscopic type 3-5 were independent prognostic factors in OS, whereas the rage of lymph node dissection was not risk factor. When comparing the outcomes of D2 and D3 dissections by age, D3 dissection was better tendency in DSS in patients aged under 80, however, D2 dissection was better tendency in patients aged 80 or more. In elderly colorectal cancer patients, there was no difference in prognosis between D2 and D3 dissection, and especially in patients aged 80 years or more, D2 might be sufficient if R0 resection was possible.