For example, Interleukin 2 (IL-2) is a kind of representative cytokines, which could regulate the survival, proliferation, and differentiation of T cell and natural killer (NK) cell, which could be put to use in the treatment of malignant melanoma and renal cell carcinoma (Dranoff, 2004). This evidence concerns the gene IL2 and hereditary clear cell renal cell carcinoma.