We retrospectively reviewed medical charts of 549 patients with primary adenocarcinoma of the colon submitted to surgery between January 2006 and December 2010 in our unit. The inclusion criterion was patients with curative intent resection with pathological node negative specimens. Exclusion criteria were as follows: metastatic disease at presentation; patients submitted to total colectomy and patients with known familial adenomatous polyposis. We recruited for the study population 215 patients.
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