[Intensive preoperative hypoxic radiotherapy in combined treatment of patients with cancer of the colon].

Efficacy of combined treatment (203 patients) and surgical treatment (200 patients) alone was analyzed. In combined treatment either radiation therapy (RT) in the dose 20 Gy over 5 days (group 1) or hypoxyradiotherapy (HRT) in the same doses but in combination with hypoxia (10% oxygen and 90% nitrogen--hypoxic gas mixture HGM-10--group 2) were used in preoperative period. In group 3 HGM-9 (9% oxygen and 91% nitrogen) was used as radioprotector in preoperative period but in increased by 25% radiation doses: total 25 Gy, 5 Gy for 5 days. In the control group only radical surgical treatment was performed. Preoperative irradiation didn't increase the rate of postoperative complications. At the same time the 5-year survival rate was higher in all the groups of patients on combined treatment than in the group of patients on surgical radical treatment. In the group with HGM-9 and increased by 25% radiation doses postoperative complications rate was lower, recurrences and distant metastases occurred less frequently.