NDRG2 and esophageal squamous cell carcinoma: To examine NDRG2 expression in ESCC cell lines, we detected NDRG2 protein expression in the normal human oesophageal epithelial cell line HEEC and five ESCC cell lines (EC8712, KYSE30, Eca-109, KYSE70 and KYSE150) by western blot.