As for the expression of IL-17A in mast cells within GC tumors (Fig. 6a), and the high expression of IL-17A receptor A (IL-17RA) on GC cells (Supplementary Figure 4f), we blocked IL-17A with neutralizing antibodies or deleted IL-17A with IL-17A-knockout mast cells in our established NOD/SCID mice bearing mouse MFC-derived or human SGC-7901-derived GC. Here, IL17RA is linked to gastric cancer.