As shown in Fig. 7A, the mRNA levels of RAI14, GUCY1A2, CNGB3, FJX1, FZD2, ELOVL2, and GDPD4 were all expressed upregulated in gastric cancer tissues, except for CXCL13, whose expression level was not significantly different between gastric cancer tissues and normal cell lines. This evidence concerns the gene CXCL13 and gastric cancer.