Furthermore, mice treated with CD4+ T cells plus TCN and B7‐H2 neutralizing antibody, showed decreased the growth of GC tumors as well as the progression of diseases (Figure 7E) as well as decreased the proliferation of GC tumor cells and IL‐17A production (Figure 7F), compared to mice transfused with CD4+ T cells plus TCN and control IgG. This evidence concerns the gene ICOSLG and gastric cancer.