Among factors causing cachexia, the leading role is attributed to substances with cachectic activity produced by cancer cells and the immune system, mainly cytokines, including the vital IL-6 and others, such as TNF-α, IL-1, IFN-γ, lipolysis activating factor (LMF), and proteolysis inducing factor (PIF) [6,7]. The gene discussed is IL6; the disease is Cachexia.