EDNRA and gastric cancer: EDNRA showed marked upregulation in all gastric cancer cell lines examined (MKN‐45, NCI‐N87, MKN‐28 and HGC‐27) compared to normal gastric epithelial GSE‐1 cells, with the highest expression observed in NCI‐N87 and MKN‐28 (Figure 5A).