We further examined HERG1 expression in seven human ESCC cell lines (Eca-109, EC-9706, KYSE-30, KYSE-150, KYSE-510, TE-1, and TE-13) and a normal esophageal epithelial cell line (Het-1A). This evidence concerns the gene KCNH2 and esophageal squamous cell carcinoma.