Adjuvant chemotherapy for cancer of gastrointestinal tract: a critical review

Surgery is the only curative therapeutic approach for gastrointestinal tumors. If the tumor is deeply infiltrating through serosa or invading regional lymph nodes, the 5-year patient's survival is about 60 % and < 40 %, respectively. The natural history and prognosis of neoplasms from colon, rectum and stomach are different. Despite the unsatisfactory results obtained with radical treatment of advanced disease, there are positive studies on adjuvant treatment of colon and rectal cancer, whereas the role of such an approach is still controversial for gastric cancer. The combination of fluorouracil containing chemotherapy with radiotherapy was suggested as the most effective adjuvant treatment for patients with Dukes' B and C rectal cancer. However, the choice of chemotherapeutic regimen is still debated. A recent report, from the North Central Cancer Tumor Group, stated survival and disease-free survival advantages for patients with Dukes' C colon cancer treated with FU + levamisole for 1 year after radical surgery. Since this regimen was not proven effective in advanced disease, ongoing adjuvant trials are comparing it with the combination of FU + biochemical modulator. The role of adjuvant therapy for gastric cancer is debated. The recent development of regimens active on advanced disease result in more promising future adjuvant trials.