CEACAM5 and head and neck cancer: Some well-studied TAAs, epidermal growth factor receptor (EGFR, also known as ErbB-1 or HER1), carcinoembryonic antigen (CEA), mucin 1 (MUC1), human telomerase reverse transcriptase (hTERT), etc. are also expressed in head and neck cancers at high levels [147,148,149,150,151].