IL2 and renal cell carcinoma: Advanced renal cell carcinoma (RCC) is generally resistant to chemotherapy treatment (Yagoda, 1995; Motzer, 1999), and immunotherapy with interferon-alpha and interleukin-2 (IL-2) as single agents or in combination with the chemotherapeutic agent 5-fluorouracil is currently used as systemic treatment for some cases.