Patients with standard risk receive vincristine (1,5 mg/m2)IV on days 1, 8, 15 and 22;daunorubicin (30 mg/m2)IV on days 1, 8, 15 and 22; oral or IV prednisone 60 mg/m2/day, days 1 to 27 and 30 mg/m2/day, days 28 to 35;asparaginase 10.000 UI/m2 IM or IV, days 10 to 12, 17 to 19 and 24 to 26;cyclophosphamide (500 mg/m2)IV days 1, 2 and 29; methotrexate, cytosine arabinoside and hydrocortisone, days 1 to 22.