The kidneys are the cleaners of our body. From the moment we are born, they never stop trying to sift out the toxins in our body and then work tirelessly to expel them from the body. In the long struggle work with toxins, it is inevitable that the kidney cells will become sick. When the kidneys (especially the epithelial cells that are in direct contact with urine) are damaged during the day-to-day work, they may eventually become malignant and turn into cancerous cells. When the cancer cells grow and divide uncontrollably in the kidney, they will form a mass, which is what we call kidney cancer. Moreover, cancer cells can also form new blood vessels to provide nutrition and oxygen to themselves. This feature has also been well used in the research of anti-tumor drugs, and anti-vascular drugs have made a new breakthrough in the treatment of kidney cancer.