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Acute Leukemias

Azacitidine fails to eradicate leukemic stem/progenitor cell populations in patients with acute myeloid leukemia and myelodysplasia

Abstract

Epigenetic therapies demonstrate significant clinical activity in acute myeloid leukemia (AML) and myelodysplasia (MDS) and constitute an important new class of therapeutic agents. However hematological responses are not durable and disease relapse appears inevitable. Experimentally, leukemic stem/progenitor cells (LSC) propagate disease in animal models of AML and it has been postulated that their relative chemo-resistance contributes to disease relapse. We serially measured LSC numbers in patients with high-risk AML and MDS treated with 5'-azacitidine and sodium valproate (VAL–AZA). Fifteen out of seventy-nine patients achieved a complete remission (CR) or complete remission with incomplete blood count recovery (CRi) with VAL–AZA therapy. There was no significant reduction in the size of the LSC-containing population in non-responders. While the LSC-containing population was substantially reduced in all patients achieving a CR/CRi it was never eradicated and expansion of this population antedated morphological relapse. Similar studies were performed in seven patients with newly diagnosed AML treated with induction chemotherapy. Eradication of the LSC-containing population was observed in three patients all of whom achieved a durable CR in contrast to patients with resistant disease where LSC persistence was observed. LSC quantitation provides a novel biomarker of disease response and relapse in patients with AML treated with epigenetic therapies. New drugs that target this cellular population in vivo are required.

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Acknowledgements

Celgene Company provided AZA and an unrestricted educational grant for data management support. We thank patients and clinical teams; Naomi Robertson and Yvonne Morgan for sample processing; Susanna Akiki, Lindsey Bradley and Hayley Newell for CEBPA, NPM1, DNMT3A, IDH1, IDH2 and FISH analysis. CC was supported by CRUK ECMC Funding. NG was supported by an EMBO long-term fellowship and MRC funding. PV acknowledges funding from the Medical Research Council (MRC) Molecular Hematology Unit, MRC Disease Team Award, the Leukemia Lymphoma Research Specialist Program Grant 08030, CRUK Program Grant C7893/A12796 and the National Institute for Health Research (NIHR) Oxford Biomedical Research Center based at Oxford University Hospitals Trust, Oxford. HN was funded by Cure Leukemia (UK registered charity 1100154). NPM1 mutant monitoring studies conducted by AI and DG supported by Leukemia and Lymphoma Research (Grant Ref 07069). SF, RKH, AKB and DG were funded by National Institute for Heath Research Program Grant for assessment of minimal residual disease in the AML17 trial. RM and IL were supported by CIRM Disease Team Grant DR1–01485.

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Correspondence to C Craddock.

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Craddock, C., Quek, L., Goardon, N. et al. Azacitidine fails to eradicate leukemic stem/progenitor cell populations in patients with acute myeloid leukemia and myelodysplasia. Leukemia 27, 1028–1036 (2013). https://doi.org/10.1038/leu.2012.312

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