CEACAM5 and colorectal carcinoma: In the case of CRC, numerous tumor-associated antigens have been identified and utilized in order to target MHC class I. Among these antigens are carcinoembryonic antigen (CEA), mucin-1, squamous cell carcinoma antigen recognized by T cells 3 (SART3), β-human chorionic gonadotropin (β-hCG), Survivin-2B, and p53 [153,154].