Drug resistance: still a daunting challenge to the successful treatment of AML
- PMID: 22409994
- PMCID: PMC3348380
- DOI: 10.1016/j.drup.2012.02.001
Drug resistance: still a daunting challenge to the successful treatment of AML
Abstract
Resistance to chemotherapy remains a challenging issue for patients and their physicians. P-glycoprotein (Pgp, MDR1, ABCB1), as well as a family of structurally and functionally related proteins, are plasma membrane transporters able to efflux a variety of substrates from the cell cytoplasm, including chemotherapeutic agents. The discovery of ABCB1 made available a potential target for pharmacologic down-regulation of efflux-mediated chemotherapy resistance. In patients with acute myeloid leukemia (AML), a neoplasm characterized by proliferation of poorly differentiated myeloid progenitor cells, leukemic cells often express ABCB1 at high levels, which may lead to the development of resistance to chemotherapy. Thus, AML seemed to be a likely cancer for which the addition of drug efflux inhibitors to the chemotherapeutic regimen would improve outcomes in patients. Despite this rational hypothesis, the majority of clinical trials evaluating this strategy have failed to reach a positive endpoint, most recently the Eastern Cooperative Oncology Group E3999 trial. Here we review data suggesting the importance of ABCB1 in AML, address the failure of clinical trials to support a therapeutic strategy aimed at modulating ABCB1-mediated resistance, and consider the type of research that should be conducted in this field going forward.
Published by Elsevier Ltd.
Conflict of interest statement
Contribution: B.C.S., J.-P.G., C.P., M.R.B., S.E.B., and M.M.G. all contributed to writing the paper. Conflict-of-interest disclosure: The authors declare no competing financial interests.
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