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The early detection of colorectal cancer is key to the improvement of patient survival. Although fecal occult blood testing and carcinoembryonic antigen (CEA) in serum are widely used as non-invasive screening methods, they have limited sensitivity. Forty-five patients who underwent surgery for primary colorectal cancer were enrolled in this study. Sixteen (36%) were determined to have Stage I tumors, 15 (33%) Stage II tumors and 14 (31%) Stage III tumors. Serum samples from a non-colorectaldoi:10.3892/mmr_00000124 pmid:21475853 fatcat:3rngjpeor5gpfe6kycyggs4psq