Decitabine Combined With Unrelated Cord Blood Transplantation for Elderly Patients With AML

Inclusion Criteria: 1. AML patients diagnosed by bone marrow morphology and Immunology; 2. Exclusion of APL by Bone marrow morphology or molecular level; 3. A patient who has obtained bone marrow cytology remission after inductive treatment; 4. Aged from 60 to 75 years; 5. Liver and kidney function: blood bilirubin ≤ 35μmol / L, AST or/ALT \<2 times the upper limit of normal (ULN), serum creatinine;≤ 150μmol / L; 6. The function of Heart is normal; 7. Physical condition score 0-2 (ECOG score); 8. Get informed consent signed by patient or family member. Exclusion Criteria: 1. APL patients, treatment-related AML; 2. Retreatment of patients; 3. Allergies to any of the drugs involved in the protocol; 4. There are obvious contraindications to chemotherapy drugs; 5. Liver and kidney function is obviously abnormal, exceeding the inclusion criteria; 6. Serious heart disease, including myocardial infarction, cardiac insufficiency; 7. Suffering from other organ malignant tumors at the same time ; 8. Active period of tuberculosis patients and HIV-positive patients; 9. Suffering from other blood system diseases at the same time; 10. Pregnancy or breastfeeding; 11. Cannot understand or follow the research plan; 12. A history of intolerance or allergies to similar drugs; 13. Patients under 60 years of age or over 75 years of age; 14. Participate in other clinical researchers at the same time; 15. There are other situations that hinder the conduct of the study.