Kidney cancer is a form of cancer that begins in the two bean-shaped organs known as the Kidneys. Kidney cancer forms as a result of kidney cells beginning to grow uncontrollably.
The most common form of kidney cancer in adults is renal cell carcinoma. According to the American Cancer Society, approximately 90% of all kidney cancers are renal cell carcinoma. The main types of renal cell cancer include clear cell, papillary, and chromophobe.