Reinduction Treatment - This phase of treatment is part of continuation and will be started at weeks 7 and 17 after bone marrow examination confirms complete remission. Doxorubicin and HD-cytarabine will be held if ANC < or equal to 300/mm3 or WBC < 1000/mm3.It is preferable to start HD-cytarabine when WBC > or equal to 1800/mm3 and ANC > 300/mm3 Reinduction treatment will be given twice: weeks 7 to 9 and weeks 17 to 19 for all patients. Intrathecal treatment will be followed by leucovorin rescue (5 mg/m2/dose PO, max 5 mg) at 24 and 30 hours only in patients with prior CNS toxicities or in patients with WBC < 1500/mm3, or ANC < 500/mm3.