<qa>  What is the name of the drug used in chemotherapy?RATIONALE: Drugs used in chemotherapy, such as fluorouracil and cisplatin, work in different ways to stop tumor cells from dividing so they stop growing or die. Interferon alfa may interfere with the growth of tumor cells. Radiation therapy uses high-energy radiation from x-rays and other sources to kill tumor cells. Combining chemotherapy with interferon alfa and giving them with radiation therapy after surgery may kill any remaining tumor cells. 