To explore the function of SLC7A9 in gastric cancer, the SLC7A9 expression levels were determined in eight gastric cancer cell lines (AGS, MKN45, HGC27, MGC803, NCI–N87, FU97, SGC7901, and HS-746T cells) and one immortalised stomach epithelial cell line (GES1 cells; Fig. 3a). The gene discussed is SLC7A9; the disease is gastric cancer.