- Arm I: Patients receive intrathecal (IT) cytarabine on day 1; vincristine (VCR) IV and daunorubicin IV on days 1, 8, 15, and 22; oral or IV dexamethasone twice daily on days 1-14; IT methotrexate (MTX) on days 8 and 29*; and pegaspargase intramuscularly (IM) once on day 4, 5, or 6.