• Efficacy of treatment in adults with standard risk acute lymphoblastic leukemia [ Time Frame: 2 years ]
  

• Demonstrate that in this group of patients, the CNS relapse is not frequently and is not necessary cranial radiotherapy [ Time Frame: 2 years ]
  
• To evaluate the treatment tolerance [ Time Frame: 1 year ]
  

Induction therapy:

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.

Patients older than 55 years are not treated with asparaginase and cyclophosphamide.

Consolidation therapy (1):

Standard risk: Mercaptopurine 50 mg/m2, PO, days 1 to 7, 28-35 and 56-63; methotrexate (3g/m2)IV/24 hours, day 1, 28 and 56; VM-26 (150 mg/m2)/12 hours, IV, days 14 and 42; ARA-C (500 mg/m2)/12 hours, IV days 14-15 and 42-43; intrathecally treatment, days 1, 28 and 56.

Patients over 50 years: Mercaptopurine (50 mg/m2), PO, days 1 to 7, 28-35 and 56-63;methotrexate (1,5 g/m2) IV/24 hours, day 1, 28 and 56; VM-26 (150 mg/m2)/12 hours, IV days 14 and 42; ARA-C (500 mg/m2)/12 hours, IV days 14-15 and 42-43; intrathecally treatment, days 1, 28 and 56.

Consolidation therapy (2)/Reinduction: one cycle similar to induction. It starts one week after last dose of mercaptopurine.Dexamethasone 10 mg/m2/day,PO or IV, days 1-14 and 5 mg/m2/day, PO or IV days 15-21; VCR: 1,5 mg/m2 IV, days 1, 8 and 15; Daunorubicin 30 mg/m2 IV, days 1, 2, 8 and 9; cyclophosphamide 600 mg/m2/day IV, days 1 and 15; Asparaginase: 10.000 UI/m2 IM or IV, days 1-3 and 15-17;intrathecally treatment days 1 and 15

Maintenance therapy 1:administration of continuous chemotherapy (mercaptopurine and methotrexate) and reinductions until one year from diagnosis.

• Continuous chemotherapy:

  • MP 50 mg/m2/day PO
  • MTX 20 mg/m2/week IM

• Reinductions

  • VCR: 1,5 mg/m2 IV, day 1.
  • PDN: 60 mg/m2/day, IV or PO days 1 to 7
  • L-ASA: 20.000 UI/m2, IM or IV day 1.
  • Intrathecally day 1

Seven cycles, weeks 25, 29, 33, 37, 41, 45 and 49.

Maintenance therapy 2:administration of continuous chemotherapy (mercaptopurine and methotrexate) while second year from diagnosis (weeks 53 to 104).

• MP 50 mg/m2/day, PO
• MTX 20 mg/m2/week, IM.