CEACAM5 and colorectal carcinoma: Moreover, the mean serum level of CEA in patients with CRC was significantly higher (15.08 ± 19.11 ng/mL) than the level in HC (2.52 ± 0.42 ng/mL; p < 0.0001) and patients with adenomas (6.11 ± 2.43 ng/mL; p < 0.005) (Figure 1(b)).