CEACAM5 and neoplasm: To evaluate MLN micrometastases in patients who undergo surgical resection for NSCLC [16, 20]., we used a combination of markers, which are cytokeratin 19 (CK19) and epithelial cell adhesion molecule (EpCAM), that are both known as stand-alone markers for NSCLC and expressed regardless of histologic subtype of NSCLC [7, 11], and CEACAM5, which is a commonly used tumour marker.