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Genetically Engineered Allogeneic Stem Cell Transplantation Followed by Chimeric Antigen Receptor T Cell Therapy for Treating Patients with Relapsed or Refractory Acute Myeloid Leukemia

Trial Status: temporarily closed to accrual

This phase I trial tests the feasibility, safety and effectiveness of genetically engineered hematopoietic stem progenitor cell transplantation followed by chimeric antigen receptor (CAR) T cell therapy for treating patients with acute myeloid leukemia (AML) that has come back after a period of improvement (relapsed) or that has not responded to previous treatment (refractory). CD33 knockout hematopoietic stem progenitor cells (CD33KO-HSPC) are donor stem cells that have been modified so that the CD33 protein the cells usually show on their surface is not shown anymore. This makes the bone marrow cells "invisible" to the CAR T cells and makes the CAR T cell therapy safer. CAR T-cell therapy is a type of treatment in which the donors T cells (a type of immune system cell) are changed in the laboratory so they will attack cancer cells. T cells are taken from the donors blood. Then the gene for a special receptor that binds to a certain protein on the patient’s cancer cells is added to the T cells in the laboratory. The special receptor is called a CAR. Large numbers of the CAR T cells are grown in the laboratory and given to the patient by infusion for treatment of certain cancers. Conditioning chemotherapy before stem cell transplantation helps kill cancer cells in the body and helps make room in the bone marrow for new stem cells to grow. Giving CD33KO-HSPC followed by CAR T therapy may be safe, tolerable and/or effective in treating patients with relapsed or refractory AML.