CEACAM5 and neoplasm: The patient’s serum tumor markers, including carcinoembryonic antigen (CEA), cancer antigens 125 (CA125), cytokeratin 19-fragments (CYFRA21-1), and squamous cell carcinoma antigen (SCC), were all within normal limits except for neuron specific enolase (NSE), which was observed to be elevated to a level of 30ng/ml.