The intensification phase begins as soon as the CNS phase ends and lasts approximately 30 weeks. It consists of cycles of chemotherapy repeated every 3 weeks, along with asparaginase administered weekly. The drugs given are as follows: Vincristine; day 1: Dexamethasone; days 1-5: 6-MP; days 1-14: Doxorubicin; day 1: Asparaginase; weekly: Methotrexate; weekly: Intra-thecal Hydrocortisone/Methotrexate/cytarabine; every 18 weeks.