Ph1 Trial Test Safety of IL-21 NK Cells for Induction of R/R AML

  • participants needed
  • sponsor
    Sumithira Vasu
Updated on 1 February 2023
myeloid leukemia
carbon monoxide
ejection fraction
cell transplantation
refractory acute myeloid leukemia (aml)


This phase I trial studies the side effects of donor natural killer (NK) cell therapy in treating patients with acute myeloid leukemia that has come back (recurrent) or has not responded to treatment (refractory). Natural killer cells are a type of immune cell. Immunotherapy with genetically modified NK cells from donors may induce changes in the body's immune system and may interfere with the ability of cancer cells to grow and spread.



I. To determine the safety of adoptive NK cell therapy using membrane-bound interleukin-21 (mbIL21)-expanded, off-the-shelf, third-party donor-derived NK cells in patients with relapsed/refractory acute myeloid leukemia (AML).


I. Estimate the complete response (CR, CR with incomplete hematologic recovery [CRi] & morphologic leukemia-free state [MLFS]).

II. Estimate the median relapse free survival. III. Estimate the median time to neutrophil and platelet count recovery. IV. Estimate the median duration of remission. V. Estimate the incidence of infectious complications. VI. Estimate percentage of patients receiving this regimen who are rendered transplant-eligible.


I. Determine the persistence of ex-vivo expanded, off-the-shelf, third-party NK cells.

II. Characterize in vivo expansion of third-party NK cells and if it differs based on the conditioning regimen as defined by NK chimerism assay.

III. Determine the immunophenotype and function of expanded cells. IV. Chimerism analysis in patients who have had post-transplant relapses.

OUTLINE: This is a dose-escalation study of membrane-bound interleukin-21-expanded haploidentical natural killer cells.

INDUCTION: Patients receive fludarabine intravenously (IV) and cytarabine IV on days -6 to -2 in the absence of disease progression or unacceptable toxicity.

COHORT II: Patients who are >= 60 years old, unable/unwilling to tolerate intensive chemotherapy, or disease insensitive to cytarabine (tp53, TET2 mutations) receive fludarabine IV on days -5 to -2 and decitabine IV on days -6 to -2 in the absence of disease progression or unacceptable toxicity.

All patients receive membrane-bound interleukin-21-expanded haploidentical natural killer cells via infusion on days 0, 2, 4, 7, 9, and 11.

After completion of study treatment, patients are followed up to day 56.

Condition Allogeneic Stem Cell Transplant Recipient, Blasts 10 Percent or More of Bone Marrow Nucleated Cells, Recurrent Acute Myeloid Leukemia, Refractory Acute Myeloid Leukemia
Treatment fludarabine phosphate, cytarabine, Fludarabine, Decitabine, Membrane-bound Interleukin-21-Expanded Haploidentical Natural Killer Cells, Cytarabine Hydrochloride
Clinical Study IdentifierNCT04220684
SponsorSumithira Vasu
Last Modified on1 February 2023

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