Adult Acute Myeloid Leukemia in Remission Clinical Trial
Official title:
INFUSION OF ALLOREACTIVE NK CELLS AS CONSOLIDATION STRATEGY FOR ADULT ACUTE MYELOID LEUKEMIA PATIENTS: A MULTICENTER CLINICAL STUDY
Acute Myeloid Leukemia (AML) patients who had achieved Complete Remission (CR) after (re)induction/consolidation chemotherapy will receive the infusion of alloreactive NK cells. Adult AML patients in morphologic, but not cytogenetic and/or molecular CR and AML patients in morphologic plus cytogenetic and/or molecular CR, not eligible for Stem Cell Transplantation (SCT), will be included. Using a genetic randomization through a 'donor' vs 'no donor' approach, patients will undergo NK cell infusion (ARM 1) or followed-up without treatment (ARM 2). Donor alloreactive NK cell repertoire will be evaluated in order to determine the functional cell dose to be used for NK cell collection. NK cells will be selected from a steady-state large volume leukapheresis product from a suitable KIR-ligand incompatible donor. NK cell purification will be performed if the donor leukapheresis product contains at least 10x106 NK cells/Kg, otherwise the final decision for proceeding to NK purification will be made by the PI after careful evaluation of the number of alloreactive If the minimum collected cell dose of 2x105 total alloreactive NK cells/kg is not reached after a single leukapheresis, donors could undergo a second PB collection within 30 days from the first one. Patients will receive immunosuppressive chemotherapy, fludarabine (Flu) 25 mg/mq/ from day -7 to -3 and cyclophosphamide (Cy) 4 g/mq on day -2 (Flu/Cy). Immunosuppressive chemotherapy is not part of the procedures under study and it is used to favor NK cell engraftment. Two days after Cy administration, patients will be infused intravenously with a single dose of cryopreserved NK cells (day 0), which will be followed by subcutaneous administration of Interleuki (IL)-2 (10 x 106 IU/day, 3 times weekly) for 2 weeks (6 doses total). IL-2 administration is not part of the procedures under study and it is used to favor early in vivo expansion of infused NK cells. Peripheral blood samples will be collected for molecular assessment of microchimerism and tracking of NK cells for 30 days, immunophenotype studies, alloreactive NK cells cloning and functional assays. Bone marrow aspirate will be performed once a week until hematological recovery. Enrolled patients (ARM1 and 2) will be followed up for at least 12 months after NK cell infusion. RFS is defined as the time from patient enrollment to disease relapse.
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