PATIENT CHARACTERISTICS: Age: 3 and over Performance status: Karnofsky 50%-100% Hematopoietic: Absolute neutrophil count greater than 1,000/mm3 Platelet count greater than 100,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL AST less than 1.5 times normal Alkaline phosphatase less than 1.5 times normal Renal: Creatinine less than 1.2 mg/dL Other: Not pregnant