PATIENT CHARACTERISTICS: Age: Under 75 Performance status: ECOG 0-3 Life expectancy: At least 8 weeks Hematopoietic: WBC at least 3,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 mg/dL Renal: Creatinine normal OR Creatinine clearance greater than 50 mL/min OR Pentetic acid/ethylenediaminetetraacetic acid clearance greater than 70 mL/min Cardiovascular: No myocardial infarction in the 3 months prior to diagnosis No pericardial effusion Pulmonary: No pleural effusion seen on chest x-ray Pleural effusion identified on CT allowed, if not visible on chest x-ray Other: No medical condition that excludes the use of chemotherapy or thoracic irradiation Must be able to tolerate the prescribed study radiotherapy No other malignant tumor for at least 3 years except nonmelanoma skin cancer