In addition, the antigens, carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9), carbohydrate antigen 125 (CA125) and carbohydrate antigen 724 (CA724), are important tumour markers for the early diagnosis and prognosis of colorectal cancer [7]. This evidence concerns the gene CEACAM5 and colorectal cancer.