Exelixis, Inc. is an American biotechnology company focused on the development and commercialization of innovative therapies in the field of oncology. The company concentrates on the research and development of new therapeutic options for the treatment of various types of cancer, including liver, lung, and kidney cancer. Exelixis is known for its main drug, cabozantinib, which is used to treat several cancer types. The company collaborates with other biotechnology and pharmaceutical firms to develop new drugs and therapies.