PATIENT CHARACTERISTICS: Age: 18 and over Performance status: WHO 0-1 Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 9 g/dL Hepatic: Bilirubin no greater than 1.5 mg/dL SGOT or SGPT no greater than 2.5 times upper limit of normal Renal: Not specified Other: Effective contraception is required of all patients For more information regarding this protocol, please call 1-888-849-6482. Clinical sites are throughout the United States and Canada.