 The syndrome of anorexia-cachexie, which accompanies numerous cancers is a major comorbidity which compromises the forecast of these patients. Several cytokines pro-inflammatory as interleukines IL1 ß, IL6 or TNFa participate in the physiopathology of this syndrome at the man and the animal. Besides, it is now established that different neuronal populations, localized in the hypothalamus, are nerve centers of the control of the appetite and the energy homéostasie. However, there is not enough evidence of a direct action of cytokines on these neurones, suggesting the participation of intermediate molecules as chimiokines, inflammatory molecules produced in reaction to an immunological stress by gliales cells and acting directly on the surrounding neurones. The implication of chimiokines in the syndrome of anorexia-cachexie associated with the cancer thus seems very likely Among these, chimiokines Monocyte Chemoattractant Proteins 1-3 or MCPs represent obvious candidates because they are produced by multiple tumors. Furthermore, to the mouse, the intellectual expression of MCP1 is correlated in the anorexia led by peripheral injections of a bacterial by-product, the lipopolysaccharide LPS. 