PATIENT CHARACTERISTICS: Age: Not specified Performance status: Zubrod 0-2 Life expectancy: Not specified Hematopoietic: Absolute granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) SGOT no greater than 2 times ULN Renal: Creatinine no greater than 2.0 mg/dL Other: No other active malignancies within the past 5 years except nonmelanomatous skin cancer or other in situ cancer