SLC38A7 mRNA and protein levels in human gastric cancer cell lines (AGS, HGC27, MKN45, and NCIN87) were higher than those in normal human gastric epithelium cells (GES-1), with the highest expression detected in AGS cells and the lowest expression detected in HGC27 cells (Fig. S1A). Here, SLC38A7 is linked to gastric cancer.