Natural Killer(NK) Cell Therapy for Acute Myeloid Leukemia

Key Inclusion Criteria: * Provision of signed and dated informed consent form (ICF) * ≥18 years old * Diagnosis of r/r AML * Subjects with CD33 positive leukemia cells * Eastern Cooperative Oncology Group (ECOG) performance status ≤1 * Adequate organ function as defined in the protocol * Donor specific antibody (DSA) to QN-023a: MFI \<= 2000 Key Exclusion Criteria: * Allergic to drug used in this study * Accept other anti-tumor drug within certain time of day 0 (first QN-023a dose infusion), time window and drug defined in the protocol. * received systemic immunosuppressive therapy within 7 days of day 0, or likely to require systemic immunosuppressive therapy * Acute Promyelocytic Leukemia (APL) * Active central nervous system Leukemia. * Uncontrolled, active clinically significant infection * Clinically significant cardiovascular disease as defined in the protocol * Known HIV infection, active Hepatitis B (HBV) or Hepatitis C (HCV) infection * History of central nervous system (CNS) disease such as stroke, epilepsy. * Females are pregnant or lactating * Investigator-assessed presence of any medical or social issues that are likely to interfere with study conduct or may cause increased risk to subject