NDRG4 and adenocarcinoma: Firstly, we measured NDRG4 promoter methylation levels in five human gastric cancer cell lines (MKN-74 from well differentiated adenocarcinoma; MKN-45, MGC-803, BGC-823 and AGS, from poorly differentiated adenocarcinoma) and non cancerous gastric mucous cell (GES-1).