80% of kidney cancers are not high in malignancy, but 10%-20% of kidney cancers are very high in malignancy, including the following cases: 1. collecting ductal carcinoma, which is very high in malignancy, and the average time from discovery to death is only 6-9 months, which is related to its pathological type; 2. not timely physical examination, resulting in tumors that are particularly large, greater than 10cm, and have metastasis, metastasis to renal vein, inferior vena cava, and even heart. The difficulty and risk of surgery are particularly high; 3. Some kidney cancers have lymph node metastasis, bone metastasis, lung metastasis, liver metastasis and brain metastasis, and the malignancy is also very high; 4. A few tumors will rupture spontaneously, causing rupture and bleeding of the kidney, which will endanger life. These parts of kidney tumors have very high malignancy and need attention.