Evidence-based update of chemotherapy options for metastatic colorectal cancer.

Colorectal carcinoma is one of the most common malignancies in the Western world. Although fluorouracil (5-FU) has been used for over 40 years, only in the last decade has its value been recognized in the treatment of advanced colorectal cancer. Early randomized studies explored the best possible doses and schedules of 5-FU and its modulators such as folinic acid or leucovorin (LV) in combination with respect to efficacy and side-effects. The development of oral fluoropyrimidines, in particular capecitabine, has made chemotherapy further accessible and acceptable. The introduction of newer cytotoxics irinotecan and oxaliplatin has achieved a significant improvement in survival rates with manageable toxicity. With appropriate selection of patients and proper sequencing of currently most efficient regimens, median survival durations of around 20 months can now be reached. Novel targeted therapies (bevacizumab, cetuximab and cyclooxygenase-2 (COX-2) inhibitors) in combination with most efficient chemotherapy regimens will probably push the median survival beyond the 2-year mark. The present article is an overview of most important studies that have substantially changed the approach to metastatic colorectal cancer and have given the patients and clinicians a wider range of options for treating this illness.