Finally, in animal experiments, the results in Figure 5J show that after tail-vein injection of MGC803 cells with OSTM1 knockdown (sh-OSTM1 group), the S100A4 protein expression (detected by immunohistochemistry) in the formed gastric-cancer lung metastases is lower than that in the control group (sh-NC group). Here, OSTM1 is linked to gastric cancer.