Patients with unresectable metastatic colorectal cancer confined to the liver will undergo a 1 hour hyperthermic isolated hepatic perfusion (IHP) with escalating dose melphalan. Postoperatively, patients will be treated with hepatic arterial infusion of floxuridine (FUDR), 0.2 mg/kg/day and leucovorin (LV), 15 mg/M2/day as a 2-week continuous infusion regimen. Hepatic and systemic toxicity, response to treatment, duration of response, and survival will be followed.