Tumor-associated antigens commonly expressed in CRC include mucin 1 (MUC1), carcinoembryonic antigen (CEA), human epidermal growth factor receptor 2 (HER2)/neu, epidermal growth factor receptor (EGFR), epithelial cell adhesion molecule (EpCAM), telomerase, heparanase, and tumor protein p53 (TP53). This evidence concerns the gene CEACAM5 and colorectal carcinoma.