PATIENT CHARACTERISTICS: Age: 15 to 80 Performance status: Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Alkaline phosphatase no greater than 2 times normal Transaminases no greater than 2 times normal Renal: Not specified