The spread of cancer is caused by genes, and in the early stages of kidney cancer, it does not spread. If there is spreading, it indicates that the cancer has reached an advanced stage, and treatment becomes difficult at this time. If spreading occurs, the main goal is to control the disease and extend survival time, therefore, it is recommended that patients undergo biological treatment. Biological therapy can alleviate the clinical symptoms of late-stage tumor patients who have lost the opportunity for surgery, or where cancer cells have recurred or metastasized, and gradually helps to restore balance to the immune system. Normally, attention should be paid to a low-salt diet, eating light and vitamin-rich foods, and patients with severe edema and high blood pressure should avoid salt intake.