Gorges TM [24] indicated that with the use of EpCAM-based detection, numerous cells escape in the blood samples of cancer patients as a result of the EMT process, which is characterized by the downregulation of epithelial markers, such as EpCAM, and upregulation of mesenchymal markers, such as Twist and EGFR, on CTCs. The gene discussed is EGFR; the disease is cancer.