<qa>  What is the primary cancer treatment?Signed written informed consent. Curative resection of colon cancer and upper rectal cancer, which is not planned for radiotherapy. Histologically proved adenocarcinoma of the colon. Stages: T1-4N2M0 LN 4 Age less or equal to 70 years old. Performance status: 0 to 1 ECOG Adequate liver function Bil. 2 mgdl, GOT, GPT 3x normal limit Adequate renal function Cr 2.0 mgdl Adequate bone marrow functionWBC 3500mm3, Platelet 100000mm3 Individual regular follow-up possible. 3.320 Patient who can receive adjuvant chemotherapy within 6 weeks after operation. 