CEACAM5 and colorectal cancer: It is estimated that up to 30% of all colorectal cancers are an inheritable disease.36, 37 CEA is so commonly expressed by colorectal cancers (89%), it is the favored biomarker for this type of cancer.2, 38 Additionally, among sporadic colorectal cancers, approximately 15% have pervasive microsatellite instabilities (MSIs) that promote transformation.39