A significant number of patients with colorectal cancer have metastases (MTS) to the liver. Cytoreductive surgery (CRS) and new antitumor drugs provide promising results. The aim of the study was to evaluate clinical results of CRS in combination with modern antitumor drug irinotekan (kampto). Forty-seven patients suffering from colorectal cancer with MTS to the liver were treated. Primary focus was resected. All the patients were divided into 4 groups depending on combination of surgical treatment and chemotherapy: with liver resection and complete removal (or devitalization) of metastatic lesions in combination with postoperative intravenous (group 1) or intraarterial regional (group 2) injection of Irinotekan and without resection of the liver with implantation of a catheter to the hepatic artery with postoperative intraarterial (group 3) or systemic intravenous (group 4) therapy with Irinotekan. Mean dose of kampto was 350 mg per 1 m2 of body surface. It was demonstrated that intraarterial infusion was highly effective. The follow-up in group 1 was 9.5 +/- 3.75 months, in group 2--11.3 +/- 4.2, in group 3--6.5 +/- 5.3, in group 4--4.6 +/- 2.3 months. It is concluded that cytoreduction of the the liver with intraarterial intrahepatic regional chemotherapy is an effective method of treatment of patients with metastatic colorectal cancer of the liver.