PATIENT CHARACTERISTICS: Age: 18 to 70 Performance status: WHO 0-2 Hematopoietic: WBC at least 4,000 Platelets at least 100,000 Hemoglobin normal (at least 6.8 mmoles/liter) Hepatic: Bilirubin no greater than 2 times normal Other liver function tests no greater than 2 times normal Renal: Creatinine no greater than 1.3 mg/dL (120 micromoles/liter) Creatinine clearance greater than 60 mL/min Other: No active, uncontrolled infection No requirement for antibiotics that might interfere with platinum excretion No requirement for drugs affecting bone marrow function (e.g., lithium, corticosteroids) No medical condition precluding postoperative chemotherapy No prior or concurrent malignancy other than nonmelanomatous skin cancer