Stopped: Terminated after interim analysis
RATIONALE: Drugs used in chemotherapy, such as 5-fluorouracil, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing and also as a radiosensibilisant. Radiation therapy uses high-energy x-rays to kill tumor cells. 5-fluorouracil may make tumor cells more sensitive to radiation therapy. Oral 5-fluorouracil is more convenient for ambulatory patients. Giving UFT (Tegafur and Uracil) with radiation therapy before surgery may shrink the tumor so it can be removed. PURPOSE: This phase III trial is studying how well giving UFT with radiation therapy works in treating patients who are undergoing surgery for operable rectal cancer.
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Compare the rate of pathologic complete response of the primary tumor in patients with operable rectal cancer receiving preoperative chemoradiotherapy versus patients receiving radiotherapy alone