PATIENT CHARACTERISTICS: Age: 0-120 Performance status: ECOG 0-2 Life expectancy: At least 6 weeks Hematopoietic: WBC at least 1500/ mm3 Platelets at least 50,000/mm3 Hepatic: Serum bilirubin no greater than 3.0 mg/dL Renal: Serum creatinine no greater than 3.0 mg/dL Cardiovascular: Pulmonary: Other: Active infection(s) allowed if drug receiving treatment No Zidovudine during combined modality chemotherapy and radition Negative CSF cytology