Acute Myeloid Leukemia Refractory Clinical Trial
Official title:
Infusion of ex Vivo-generated Allogeneic Natural Killer Cells in Combination With Subcutaneous IL-2 in Patients With Acute Myeloid Leukemia: a Phase I/IIa Study
This study investigates an innovative treatment for relapsed or refractory acute myeloid leukemia exploiting administration of ex vivo-generated allogeneic natural killer (NK) cells with preceding non-myeloablative conditioning chemotherapy with or without subsequent in vivo IL-2 cytokine support.
This study investigates an innovative treatment for relapsed or refractory acute myeloid leukemia (AML) exploiting administration of ex vivo-generated allogeneic natural killer (NK) cells with preceding non-myeloablative conditioning chemotherapy with or without subsequent in vivo IL-2 cytokine support. This is a prospective phase I/IIa study. The first phase is a IL-2 dose-escalating safety study in twelve patients. The second phase of the study is designed as a Simon's optimal two-stage single-arm phase IIa study, comprising seventeen patients. Prior to NK cell infusion, all patients will receive cyclophosphamide and fludarabine (Cy/Flu) based lymphodepleting chemotherapy. On day 0, all patients will receive a fixed dose of 1.0-3.0 x 10^9 allogeneic umbilical cord blood-derived NK cells (UCB-NK cells). These cells are generated ex vivo from CD34+ hematopoietic progenitor cells obtained from an allogeneic UCB unit. In phase I of the study patients will receive UCB-NK cells without subcutaneous (SC) IL-2, with lower dose SC IL-2 or with higher dose SC IL-2 (n=3 per treatment group, n=6 in the highest tolerable dose). After establishing the safety of UCB-NK cells combined with SC IL-2, we will continue with phase IIa of the study, with ten patients in the first stage (including the six patients from phase I with comparable IL-2 dose) and if clinical efficacy is achieved an additional seven patients in the second stage. ;
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