<prompt> A 56-year-old chronic smoker, mass in bronchus resected. What is the possible marker-CytokeratinVimentinEpithelial membrane CadherinLeukocyte  <response>: Squamous cell carcinoma is most commonly found in men and is closely correlated with a smoking histoty.Histologically, it is characterized by keratinization and intracellular bridges.Cytokeratin is a marker for keratinizing cells. 