KRT18 and non-small cell lung carcinoma: A similar positivity rate (26.4%) was also detected for epithelial markers (CK18 and CK19) while the positivity rate was increased (66%) regarding the EMT marker VIM indicating that in NSCLC a large fraction of CTCs is under EMT status which is further supported by the observation that 13 out of 14 (92.8%) of MCT4 overexpressed samples were found to express at least one EMT marker; conversely, the correspondent proportion of blood samples harboring at least one epithelial marker was 50%.