NKG2D CAR-T Cell Therapy for Patients With Relapsed and/or Refractory Acute Myeloid Leukemia

Inclusion Criteria: 1. Histologically confirmed diagnosis of NKG2D ligand positive AML per the US National Comprehensive Cancer Network (NCCN) Clinical Practice Guidelines for Acute Myeloid Leukemia (2016.v1); 2. Relapsed or refractory NKG2D ligand positive 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 flow cyto metry); 4. Total bilirubin ≤ 51 umol/L, ALT and AST ≤ 3 times of upper limit of normal, 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 indoor air 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 study and 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, hemorrhagic diseases; 2. Electrocardiogram shows prolonged QT interval, severe heart diseases such as severe arrhythmia in the past; 3. Pregnant (or lactating) women; 4. Patients with severe active infections (excluding simple urinary tract infection and bacterial pharyngitis); 5. Active infection of hepatitis B virus or hepatitis C virus; 6. Concurrent therapy with systemic steroids within 2 weeks prior to screening, except for the patients recently or currently receiving in haled steroids; 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 of patients or interfere with the results of study.