 INDUCTION IA PART 2: Patients receive imatinib mesylate orally PO once daily QD on days 15-33, prednisolone PO twice daily BID or methylprednisolone intravenously IV on days 15-28, vincristine sulfate IV over 1 minute on days 15 and 22, daunorubicin hydrochloride IV over 1-15 minutes on days 15 and 22, and methotrexate intrathecally IT on day 29. 