CEACAM5 and neoplasm: A total of five serum tumour markers were included: cytokeratin 19 fragment antigen (CYFRA 21.1), carcinoembryonic antigen (CEA), neuron-specific enolase (NSE), cancer antigen 125 (CA125), and squamous cell carcinoma antigen (SCC), with the first three being the most prevalent in our dataset.