Gamma-Chain (γC) receptor cytokines, including Interleukin-2 (IL-2) [77,78], Interleukin-7 (IL-7) [79,80,81,82], Interleukin-15 (IL-15) [83] and Interferon (IFN) [84], have all been tested in immunotherapeutic clinical trials to treat and control HIV infection. The gene discussed is IL15; the disease is HIV infectious disease.