IL3 CAR-T Cell Therapy for Patients With CD123 Positive Relapsed and/or Refractory Acute Myeloid Leukemia

Inclusion Criteria: 1. Histologically confirmed diagnosis of CD123+ AML per the US National Comprehensive Cancer Network (NCCN) Clinical Practice Guidelines for Acute Myeloid Leukemia (2016.v1); 2. Relapsed or refractory CD123+ AML (meeting one of the following conditions): 1. CR not achieved after standardized chemotherapy; 2. CR achieved following the first induction, but CR duration is less than 12 months; 3. Ineffectively after first or multiple remedial treatments; 4. 2 or more relapses; 3. The number of primordial cells in bone marrow is \> 5% (by morphology), and/or \> 0.01% (by flowcytometry); 4. Total bilirubin ≤ 51 umol/L, ALT and AST ≤ 3 times of upper limit ofnormal, creatinine ≤ 176.8 umol/L; 5. Echocardiogram shows left ventricular ejection fraction (LVEF) ≥50%; 6. No active infection in the lungs, blood oxygen saturation in indoorair is ≥ 92%; 7. Estimated survival time ≥ 3 months; 8. ECOG performance status 0 to 2; 9. Patients or their legal guardians volunteer to participate in the studyand sign the informed consent. Exclusion Criteria: Subjects with any of the following exclusion criteria were not eligible for this trial: 1. History of craniocerebral trauma, conscious disturbance,epilepsy,cerebrovascular ischemia, and cerebrovascular, hemorrhagicdiseases; 2. Electrocardiogram shows prolonged QT interval, severe heart diseasessuch as severe arrhythmia in the past; 3. Pregnant (or lactating) women; 4. Patients with severe active infections (excluding simple urinarytractinfectionand bacterial pharyngitis); 5. Active infection of hepatitis B virus or hepatitis C virus; 6. Concurrent therapy with systemic steroids within 2 weeks prior toscreening, except for the patients recently or currently receiving in haledsteroids; 7. Previously treated with any CAR-T cell product or other genetically-modified T cell therapies; 8. Creatinine\>2.5mg/dl, or ALT / AST \> 3 times of normal amounts, or bilirubin\>2.0 mg/dl; 9. Other uncontrolled diseases that were not suitable for this trial; 10. Patients with HIV infection; 11. Any situations that the investigator believes may increase the risk ofpatients or interfere with the results of study.