OUTLINE: This is a randomized study. Patients undergo surgical removal of the primary tumor. Following surgery, patients are randomized to receive radiotherapy alone (arm I) or chemotherapy followed by radiotherapy (arm II). Arm I: Patients begin receiving radiotherapy as soon as possible after surgery, within 28 days. Radiotherapy is administered 5 times a week for 6 weeks. Arm II: Within 28 days of surgery, patients receive vincristine IV on days 1, 7, 14, 21, 28, 35, 42, 49, 56, and 63. Carboplatin IV is administered over 1 hour on days 1, 2, 42, and 43. Etoposide IV is administered over 1 hour on days 1-3, 21-23, 42-44, and 63-65. Cyclophosphamide IV is administered over 4 hours on days 21 and 63. As soon as possible after chemotherapy, patients receive radiotherapy as in arm I. Quality of life is assessed every 3 months for the first year and annually thereafter. Patients are followed every 6 weeks for the first year, every 3 months for the second year, every 4 months for the third year, and every 6 months thereafter.