Kidney cancer is a medical condition when abnormal cells, either in one or both kidneys, start to grow and multiply uncontrollably. In some cases, the cells could spread to other tissues or organs in the body to invade areas outside of the kidneys. The kidneys are bean-shaped and are placed near the middle of your back. Humans usually have two kidneys, each roughly the size of a fist. They filter out waste products from your blood as urine. If kidney cancer spreads to another part of the body, it is called advanced or metastatic kidney cancer. Kidney cancer is used to describe the cell disorder that occurs when cells in the body begin multiplying uncontrollably in the kidney. When cells become more and continue multiplying, they start forming a tumor and eventually spread to other parts of the body. Being one of the well-known medical oncologists in Lucknow .