For example, miR-31 inhibits tumour invasion and metastasis by targeting RhoA in human GC [11]; miR-6852 suppresses cell proliferation and invasion by targeting forkhead box J1 (FOXJ1) in GC [12]; and miR-618 restricts metastasis in GC by downregulating the expression of TGF-β2 [13]. This evidence concerns the gene TGFB2 and gastric cancer.