Inclusion Criteria:  CLL1 positive relapsed/refractory acute myeloid leukemia Age 6-65 years Left ventricular ejection fractions ≥ 0.5 by echocardiography Creatinine < 1.6 mg/dL Aspartate aminotransferase/aspartate aminotransferase < 3x upper limit of normal Total bilirubin <2.0 mg/dL Karnofsky performance status ≥ 60 Expected survival time ≥ 3 months (according to investigator's judgement)  Exclusion Criteria:  Patients are pregnant or lactating Uncontrolled active infection Class III/IV cardiovascular disability according to the New York Heart Association Classification Active hepatitis B or hepatitis C infection Patients with HIV infection Patients with history of seizure Active central nervous system leukemia