PATIENT CHARACTERISTICS: Age: 18 and over Performance status: WHO 0-1 Life expectancy: Not specified Hematopoietic: WBC at least 3,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 1.5 times the upper limit of normal (ULN) Renal: Creatinine no greater than ULN Other: No prior second malignancy in the past 10 years except carcinoma in situ of the cervix or basal or squamous cell carcinoma of the skin No psychological, familial, sociological, or geographical condition that precludes study compliance Not pregnant or nursing Fertile patients must use effective contraception