patients) developed liver metastases, and 30% (44,000 patients) had metastatic disease confined to the liver. In the past, only 5% of patients who developed liver metastases from colorectal cancer were considered eligible for surgical directed therapies. 3 With improved surgical techniques, reduced postoperative mortality, and better systemic therapy, indications for surgery have broadened so that nearly one third of patients with colorectal liver metastases (14,000 patients) undergo hepatic tumor resections each year in the United States. 4-6 Outcomes of Liver Metastasis Resection Historically, liver tumor resection from the liver was associated with a high operative mortality rate. In 1898, Keen et al 7 reported a 15.5% operative mortality rate for liver resection performed in 59 cases from 1886 to 1897.