CEACAM5 and colorectal cancer: One recent study has reported identification of four biomarkers in colorectal cancer tissue from 280 patients: carcinoembryonic antigen expressed in colorectal cancer 98.8% more than in normal tissue, tumor-associated glycoprotein-72 at 79%, folate receptor-α at 37.1%, and EGFR at 32.8% (Tiernan et al., 2013).