Treatment protocol All the patients recieve an induction remission treatment with an initial pre-induction phase with steroids (prednisone) from day -7 to day -1 (-7 ,-6 = 25mg , -5 , -4 : 50mg , -3, -2: 75mg and on day -1 : 100mg). The induction remission treatment is based on a 28 day treatment with prednisone (60mg/m2),Vincristine (1.5mg/m2 maxium 2mg) and Daunorubicin 60mg/m2 on days +1, +8 and +15. If the patient archive a Complete Remission, continues with a consolidation therapy with sequential blocks of treatment that includes Cytarabine, Etoposide, Methotrexate. If the patient still on remission at the end of consolidation therapy continues on maintenance phase that includes 6-mercaptopurine and a weekly dose of methotrexate for around two years