PATIENT CHARACTERISTICS: Age: 18 and over Performance status: WHO 0-1 Life expectancy: Not specified Hematopoietic: Neutrophil count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.75 mg/dL Albumin at least 2.5 g/dL AST and ALT less than 1.5 times upper limit of normal (ULN) (2.5 times ULN if liver metastasis present) Alkaline phosphatase less than 2.5 times ULN No other significant hepatic disease (e.g., active hepatitis, cirrhosis, etc.) Renal: Creatinine no greater than 1.36 mg/dL OR Creatinine clearance at least 60 mL/min Cardiovascular: No prior cardiovascular disease Other: No other severe medical illness No psychosis No prior or concurrent second primary malignant tumors, except adequately treated carcinoma in situ of the cervix or basal cell carcinoma Fertile patients must use effective contraception