Dasatinib Combined With Chemotherapy in Relapsed t(8;21) Acute Myeloid Leukemia With KIT D816 Mutation

Inclusion Criteria: 1. T(8;21)acute myeloid leukemia patients with KIT D816 mutation diagnosed by bone marrow morphology, immunology, molecular genetics. The diagnosis and classification are according to WHO 2016 criteria. 2. Conform to relapsed diagnosis.Only morphological relapsed cases will be enrolled.Molecular relapsed and isolated extramedullary relapsed cases are not eligible. 3. Age is not limited. Both male and female are eligible. 4. Eastern Cooperative Oncology Group performance status (ECOG-PS):0-2 point. 5. Informed consent form must be signed by patients themselves before enrolled for patients aged 18 years or older. Informed consent form must be signed by the legal guardian for patients younger than 18 years. Exclusion Criteria: 1. Patients with other blood diseases at the same time (such as haemophilia, primary myelofibrosis and so on) are not considered suitable. 2. Isolated extramedullary relapsed leukemia. 3. With other malignant tumors accompanied with AML and needed treatment. 4 .Patients who are unsuitable for the trial considered by investigators.