CEACAM5 and squamous cell carcinoma: The preoperative serum level of cancer antigen 125 (CA125) was elevated to 237.3 U/ml (normal range: < 35.0), whereas the carcinoembryonic antigen (CEA), cancer antigen 19–9 (CA19–9) and squamous cell carcinoma (SCC) values were within the respective normal ranges.