KRT14 and esophageal squamous cell carcinoma: Histological examination (H&E-stained sections), as well as KRT14 immunostaining (biomarker for ESCC [50–52]), showed that 68% (17/25) of ZD3T, 15.4% (4/26) of ZD6, and 16% (4/25) of ZD12 rats harbored ESCC.