PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: WBC greater than 3,000/mm3 OR Absolute neutrophil count greater than 1,500/mm3 Platelet count greater than 100,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL SGOT and/or SGPT less than 2 times upper limit of normal Renal: Creatinine less than 2.0 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception No other serious medical illness or active infection that would preclude chemotherapy compliance No other prior malignancy unless curatively treated and disease free for the past 5 years