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PURPOSE: In colon cancer surgery, it is recommended that en bloc resection involving extended lymphadenectomy, characterized as a hemicolectomy, be performed by ligating the primary feeding artery at a high position and resecting proximal and distal with 5-cm to 10-cm bowel margins. However, there is little evidenc e to unequivocally support such extensive lymphovascular resection. METHODS: The distribution of nodal metastases was obtained by the clearing method in 164 pat ients with colon cancer. RESULTS: For pericolic spread, for pT1 tumors, the dist ance from the primary tumor to a diseased node was 2.5 cm; for pT2, the distance was less than 5 cm; for 97.0 percent of pT3 tumors and 93.3 percent of pT4 tumo rs with nodes involved, the distance was less than 7 cm. For central spread, for pT1 tumors, the rate of spread to central nodes was 0 percent; for pT2, the rat e of spread was 20.0 percent to intermediate nodes (for tumors more than 5 cm fr om the feeding artery, the rate for central nodes was 0 percent); for pT3, the r ate was 30.6 percent to intermediate nodes and 15.3 percent to main nodes; for p T4, the rate was 44.4 percent to intermediate nodes and 22.2 percent to main nod es. For curative resection cases with pT3 tumors more than 7 cm from the feeding artery, the rate to central nodes was 0 percent. CONCLUSIONS: In T1 tumors, cen tral node dissection is not required, but resection with proximal and distal 3cm margins are required; in T2, central node dissection that includes the intermed iate node should be performed in addition to resection with proximal and distal 5-cm margins. In T3 and T4, central node dissection that includes the main node should be performed in addition to resection with proximal and distal 7-cm mar gins. However, for T2 more than 5 cm from the primary feeding artery, and for T3 more than 7 cm from the primary feeding artery, proximal and distal resection a lone may be adequate.
PURPOSE: In colon cancer surgery, it is recommended that en bloc resection involving extended lymphadenectomy, characterized as a hemicolectomy, be performed by ligating the primary feeding artery at a high position and resecting proximal and distal with 5-cm to 10-cm bowel margins . However, there is little evidenc e to unequivocally support such extensive lymphovascular resection. METHODS: The distribution of nodal metastases was obtained by the clearing method in 164 patients with colon cancer. RESULTS: For pericolic spread, for pT1 tumors, the dist ance from the primary tumor to a diseased node was 2.5 cm; for pT2, the distance was less than 5 cm; for 97.0 percent of pT3 tumors and 93.3 percent of pT4 tumo rs with nodes involved, the distance was less than 7 cm. For central spread, for pT1 tumors, the rate of spread to central nodes was 0 percent; for pT2, the rat e spread was 20.0 percent to intermediate nodes (for tumors more than 5 cm fr om the feeding artery, the rate for ce ntral nodes was 0 percent); for pT3, the router was 30.6 percent to intermediate nodes and 15.3 percent to main nodes; for p T4, the rate was 44.4 percent to intermediate nodes and 22.2 percent to main nodes es. For curative resection cases with pT3 tumors more than 7 cm from the feeding artery, the rate to central nodes was 0 percent. CONCLUSIONS: In T1 tumors, cen tral node dissection is not required, but resection with proximal and distal 3 cm margins are required; in T2, central node dissection that includes the intermed iate node should be performed in addition to resection with proximal and distal 5-cm margins. In T3 and T4, central node dissection that includes the main node should be performed in addition to resection with proximal and distal 7- cm mar gins. However, for T2 more than 5 cm from the primary feeding artery, and for T3 more than 7 cm from the primary feeding artery, proximal and distal resection a lone may be adequate.