A drug used to treat advanced kidney cancer and a type of liver cancer that cannot be removed by surgery. It is also being studied in the treatment of other types of cancer. Sorafenib stops cells from dividing and may prevent the growth of new blood vessels needed for tumors to grow. It is a type of kinase inhibitor and a type of angiogenesis inhibitor. Also called BAY 43-9006, Nexavar, and sorafenib tosylate.