The CD123-Targeted CAR-NK cell therapy is a new treatment that is being investigated for treatment of acute myeloid leukemia (AML). The purpose of this study is to evaluate the safety of CD123-CAR NK cells given to these patients.

This is a study of allogenic CD123-CAR NK cells. The relapsed/refractory AML patients will receive FC (F, Fludarabine, C, Cyclophosphamide) chemotherapy followed by infusion of CD123-CAR-NK cells. No graft-versus-host disease (GVHD) prevention will be conducted before or after infusion. Dose-limiting toxicity, incidence of adverse events, disease response and PK/PD will be detected post-infusion.

Inclusion criteria:

1. Age ≥ 18 years old, no gender or race;

2. Expected survival period ≥ 3 months;

3. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 2;

4. The diagnosis of AML with bone marrow biopsy, immunohistochemistry or Flow cytometry definitively positive for CD123 and met one of the following criteria:

   A. Diagnostic criteria for relapsed AML: after complete remission (CR), leukemia cells reappeared in peripheral blood or blast cells in bone marrow ≥ 5% (except for other reasons such as bone marrow regeneration after consolidation chemotherapy) or extramedullary leukemia cell infiltration; B. Diagnostic criteria for refractory AML: naive patients who were ineffective after 2 courses of standard regimens; patients relapsed within 12 months who underwent consolidation and intensive therapy after CR; patients relapsed after 12 months but were ineffective after conventional chemotherapy; Patients with two or more relapses; patients with persistent extramedullary leukemia; C. Patients eligible for relapsed or refractory AML remained minimally residual disease positive after salvage therapy

5. Adequate organ function:

   A. Liver function: ALT≤3×ULN, AST≤3×ULN, total bilirubin≤2×ULN; B. Coagulation function: international normalized ratio (INR) or activated partial thromboplastin time (APTT) ≤ 1.5×ULN; C. Renal function: serum creatinine≤1.5×ULN or creatinine clearance rate ≥30mL/min; D. Cardiac function: Left ventricular ejection fraction (LVEF) ≥ 50%;

6. Women of child-bearing potential and all male participants must use effective methods of contraception for at least 12 months after infusion.;

7. Informed Consent/Assent: All subjects must have the ability to understand and the willingness to sign a written informed consent.

Exclusion Criteria:

1. Central nervous system involved;
2. Known contraindication to the protocol defined lymphodepleting chemotherapy regimen of fludarabine/cyclophosphamide;
3. Systemic use of hormones within 2 weeks prior to enrollment (except for patients with inhaled corticosteroids);
4. Any active infection requiring systemic therapy by intravenous infusion within 14 days prior to the first dose of study drug, including: HBV, HCV, HIV, syphilis infection, or active pulmonary tuberculosis.
5. History of hypersensitivity reactions to murine protein-containing products, or macromolecular biopharmaceuticals such as antibodies or cytokines;
6. Patients cannot guarantee effective contraception (condom or contraceptives, etc.) within 1 years after enrollment;
7. Women who are pregnant (urine/blood pregnancy test positive) or lactating;
8. Suffering from a serious autoimmune disease or immunodeficiency disease; 9 Suffering from mental illness;

10. Known alcohol dependence or drug dependence; 11. According to the investigator's judgment, the patient has other unsuitable grouping conditions.