After blood count recovery, patients receive consolidation chemotherapy comprising triple intrathecal therapy as per induction therapy on day 1 (week 11); high-dose methotrexate IV over 24 hours on weeks 8 and 12; and leucovorin calcium IV every 6 hours for 2 doses beginning 42 hours after start of high-dose methotrexate and then orally every 6 hours for 3 doses. Patients also receive etoposide IV over 2 hours followed by cyclophosphamide IV over 30 minutes on days 15-19 (week 13). Patients receive G-CSF SC or IV beginning on day 20 and continuing until blood counts recover. On days 29-31 (week 15), patients receive high-dose cytarabine IV over 3 hours every 12 hours for 4 doses and asparaginase IM 6 hours after completion of high-dose cytarabine. Patients receive G-CSF beginning 24 hours after completion of asparaginase and continuing until blood counts recover.