However, when renal cell carcinoma is more severe (this is called stage IV disease), it is much harder to treat. Current treatments include Interleukin-2, which Improves the cancer in about 5-10% of cases. Other treatments include Nexavar, Torisel, Sutent, Interferon, and Bevacizumab. In some cases, surgeons might remove both the original tumor in the kidney and the ones that spread to other parts of the body. carcinoma.