Resection of Liver Metastases in Colorectal Cancer in the Era of Expanding Systemic Therapy.

About 25% of patients with colorectal cancer develop liver metastases after resection of the primary tumor, and surgical resection of the metastases offers the only opportunity for long-term survival. However, only 20% of patients present with resectable disease. Deciding which patients should be offered surgery, and which should receive additional treatment in the form of perioperative chemotherapy, is complex. For the majority of patients who present with technically irresectable liver-limited disease, systemic downsizing chemotherapy offers the only opportunity to reach surgery and potential cure. Molecular analysis of tumor tissue is improving patient stratification, allowing more appropriate treatment selection, but is not yet a regular part of clinical practice. Decision making is limited by a lack of clear prospective evidence, and so multidisciplinary team assessment is essential to optimize outcomes.