VP -16 100 mg/m2 ( infusion 1 hour), 14-15 and 42-43 ARA- C 500 mg/m2 iv every 12 hours , 3 hours , 14-15 and 42-43 . Intrathecal Chemotherapy or Methotrexate ( MTX ) 12 mg on days 1, 28 and 56 or ARA- C: 30 mg days 1, 28 and 56 or Hydrocortisone 20 mg days 1, 28 and 56