alexa Defining and managing imatinib resistance.
Oncology

Oncology

Journal of Leukemia

Author(s): Mauro MJ

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Abstract While imatinib is highly effective therapy, with improving prospects over time for sustained remission and potential to severely limit or eliminate disease progression and transformation, a minority of patients either fail or respond suboptimally to imatinib; as well, disease eradication may not be possible with imatinib. Distinct patterns of resistance have evolved with the use of imatinib, and Abl kinase mutations, which alter imatinib binding or favor kinase conformations inaccessible to imatinib, are a common finding associated with clinical resistance. Dasatinib and nilotinib, alternate Abl kinase inhibitors, restore hematologic and cytogenetic remission in the majority of patients with primary failure or acquired resistance in chronic phase disease; in advanced disease and Philadelphia chromosome (Ph)(+) ALL, responses are more limited and relapse is common. Future studies with these agents will focus on further optimizing imatinib response, reduction of minimal residual disease, and prevention of resistance. Still newer inhibitors active against T315I mutant BCR-ABL may overcome primary and secondary resistance to dasatinib and nilotinib. This article was published in Hematology Am Soc Hematol Educ Program and referenced in Journal of Leukemia

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