Caporali et al suggested that microRNA‐126‐3p may contribute to the dabrafenib resistance of melanoma via up‐regulating ADAM9 Caporali16; Oria et al found that ADAM9 may contribute to the development of pancreatic ductal adenocarcinoma17; Dong et al demonstrated that ADAM9 can induce the epithelial‐mesenchymal transition of the hepatoma cells18; Wang et al suggested that ADAM9 functions as an oncogene in gastric cancer, and it was negatively regulated by micoRNA‐126.14 A study on the roles of ADAM9 in OC is limited. This evidence concerns the gene ADAM9 and gastric cancer.