The invasion and migration of stomach cancer cells, as well as their peritoneal, lung, and liver metastases, are markedly enhanced by overexpression of CST1.138 USP7 regulates SCD1 through deubiquitination, inhibiting ROS, MDA accumulation, and iron overload, thereby inhibiting ferroptosis in gastric cancer cells. The gene discussed is USP7; the disease is gastric cancer.