XELOX (Capecitabine and Oxaliplatin) is an effective and convenient regimen for patients with metastatic colorectal cancer. Chronomodulated therapy may reduce toxicity. Patients will be randomized to standard XELOX (Capecitabine 1000 mg/m² in the morning and 1000 mg/m² in the evening days 1-14 and short term Oxaliplatin 130 mg/m² day 1 in 30 minutes) or chronomodulated XELOX (Capecitabine 400 mg/m² in the morning and 1600 mg/m² in the evening days 1-14 and short term Oxaliplatin 130 mg/m² day 1 in 30 minutes).