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The serum carcinoembryonic antigen (CEA) is an important prognostic factor in colorectal cancer, however the rectum presents different routes of venous drainage, stating that the level of CEA in peripheral and mesenteric rectal tumors may be different, depending on the location of the tumor in the rectal segment.

CARCINOEMBRYONIC ANTIGEN LEVELS IN THE PERIPHERAL AND MESENTERIC VENOUS BLOOD OF PATIENTS WITH RECTAL CARCINOMA