CEACAM5 and neoplasm: The E6 or E7 peptide-specific T cell response frequency also did not show differences when the patients were grouped according to age, clinical stage, tumour size, tumour type, histologic grade, HPV 16 status, or levels of carcinoembryonic antigen (CEA), tumour-specific growth factor (TSGF) or squamous cell carcinoma antigen (SCC-Ag).