NDRG2 and esophageal squamous cell carcinoma: To further examine whether expression of the NDRG2 protein is linked to the clinical progression of ESCC, the following samples were subjected to IHC staining with a human NDRG2 antibody: 143 paraffin-embedded, archived ESCC tissue samples, including 5 cases of stage I, 64 cases of stage IIA, 23 cases of stage IIB, 38 cases of stage III and 13 cases of stage IV tumors.