Cancer cachexia is responsible for the death of approximately 20% of patients. Myostatin is a master negative regulator of skeletal muscle mass. If the role of myostatin in cancer cachexia is now well established in murine models, no study has focused on muscle expression of Myostatin in relation to the degree of cachexia. the hypothesize is that muscle Myostatin a biological marker of cachexia in patients with colon cancer. The main objective is to compare skeletal muscle Myostatin messenger RiboNucleic Acid (mRNA) level as a function of cachexia in colon cancer patients. Myostatin messenger RiboNucleic Acid (mRNA) level will be determined in a muscle sample taken during the resection under general anaesthesia. Skeletal muscle index will be determined before surgery, 3 and 6 months after surgery. Muscle strength of the lower and upper limbs will be determined before resection, at 1 month, 3 months and 6 months postoperatively. Blood sampling will also be performed on these 4 occasions.