e15168 Background: High incidence and steady rise of rectal cancer morbidity, unsatisfactory treatment results, amount of disabling surgery, high rate of local recurrents advocate for searching for new methods of combined treatment of locally advanced rectal cancer. Methods: We had suggested to rectally install sterile hydrogel material based on sodium alginate with incorporated 5-FU for radio modification purposes during neoadjuvant chemo radiotherapy. 39 patients with histologically confirmed diagnosis were included into our study. 19 patients received preoperative radiotherapy with summary dose of 50-56 Gy and systemic chemotherapy with fluorpirimidines and rectally admitted hydrogel material with incorporated 5-FU twice per day. Control group consisted of 20 patients who had similar treatment, excluding rectal hydrogel installations. Results: There was no increase in early radiotherapy complications noticed. Three study group patients had complete response, 16 had partial response (versus 1 CR, 15 PR, 3 stabilization and 1 progression in control group). This allowed reduction of surgical assistance volume in seven patients - sphincter-preserving operations were performed. Grade 3-4 pathomorphosis by Dworak’s scale was identified in 17 out of 19 patients (13 out of 20 in control group). Conclusions: Use of hydrogel material based on sodium alginate with incorporated 5-FU does not increase amount and intensity of radiation induced complications, allows to improve patients quality of life and treatment results.
