Pan-cancer analysis showed that MM9 was almost always downregulated among the 16 tumors, including GC; MMP2 was upregulated in BLCA, CESC, KICH, and UCEC and downregulated in CHOL, GBM, HNSC, KIRP, PRAD, SKCM, and GC (Fig. 7A and B). This evidence concerns the gene MMP2 and gastric cancer.