Keywords: leukemia chemotherapy

    Untreated patients with leukemia, whose leukemia cells in the body is about 5 × 1010 1013. Complete remission in patients with leukemia clinical symptoms and signs have completely disappeared, the blood and bone marrow has basically returned to normal, but the body still remains a considerable number (108, 109 or below) the leukemia cells in the bone marrow outside the retreat can still infiltration of leukemic cells, these residual leukemia cells can cause disease recurrence. To further eliminate residual leukemia cells, to prevent recurrence, to extend remission and survival time, to fight leukemia cure, still need to adopt a positive consolidate and intensive treatment, and for quite a long period (2-3 years) in complete remission.