KRAS and colorectal carcinoma: The common markers for CRC are human epidermal growth factor receptor-2 (HER2), the kirsten rat sarcoma viral oncogene homolog (KRAS), B-Raf proto-oncogene (BRAF), tumor suppressor gene (P53), Adenomatous polyposis coli (APC), Cytokeratin 7 (CK7), CK70, caudal type homeobox 2 (CDX2), Mucin-2 (MUC2), etc. (23).