Cancer embolism generally refers to the collection of cancer cells inside the blood in a mass, like a blood clot, in which case it means metastasis. However, it also depends on whether the cancer embolism is formed locally or distantly. For example, in the case of kidney cancer, cancer clots may be formed in the middle of the kidney blood vessels, and it is possible to remove the cancer clots from the kidney during surgery, in which case there is still hope for a cure. However, it is also possible that the cancer cells may metastasize to other places with blood circulation, which is also dangerous and may cause cerebral thrombosis and cardiac thrombosis. Therefore, further treatment is needed, including the application of minimally invasive vascular surgery to stop the further development of cancer clots, as well as anti-tumor therapy, such as radiotherapy, chemotherapy, targeted drug therapy and so on. But once there is cancer embolism, it means the treatment effect may not be too good.