CEACAM5 and colorectal carcinoma: For serum CEA concentrations, levels for preoperative CRC patients, postoperative CRC patients, ACA patients, and controls were 14.66±2.25 μg/l, 4.48±0.72 μg/l, 3.10±1.15 μg/l, and 2.43±0.28 μg/l, respectively (ACA vs. healthy control, P = 0.797; CRC vs. healthy control, P = 0.000).