PATIENT CHARACTERISTICS: Age: 15 and over Performance status: Zubrod 0-2 Life expectancy: Not specified Hematopoietic: See Disease Characteristics Hepatic: Bilirubin no greater than 2.0 mg/dL Renal: Creatinine no greater than 2.0 mg/dL Cardiovascular: No New York Heart Association class III or IV heart disease Other: No active or uncontrolled infection Not pregnant or nursing Fertile patients must use effective contraception No other active cancer except skin cancer