Sarcopenia is a term first used in 1988 by Rosenberg, meaning an age-related loss in skeletal muscle mass and function. It was derived from the greek: sarx = flesh and penia = loss. In 2010, a European Consensus defined sarcopenia as a triad of muscle mass loss, decreased functional performance and muscle strength. It has been reported as a hallmark of cancer, with impact on prognosis, response to treatments, side effects of chemotherapy and recovery after surgery. The prevalence of sarcopenia in advanced cancer seems to vary according to gender, stage, primary tumor location and treatments, being present in about 28 to 67% of patients.