HMGA2 and gastric cancer: To investigate the role of HMGA2 in the malignant phenotypes of GC cells regulated by circ_0000267, MGC‐803 cells overexpressing circ_0000267 was co‐transfected with HMGA2 shRNA, and SGC‐7901 with circ_0000267 knockdown was co‐transfected with HMGA2 overexpression plasmid (Figure 6b).