How long the colorectal cancer should be treated?

Colorectal cancer is one of the leading cancer-related death worldwide. The optimal treatment duration of metastatic colorectal cancer depends on the individual treatment aim and it should be decided by an onco-team and by the patient. In this review several actual issues will be discussed, like the optimal duration of therapy to reach the secondary resection, the accepted response rate and best treatment strategy in case of non-operable colorectal cancer. Furthermore, emphasis is given to the most useful endpoints to evaluate different therapeutic approaches.