MK-0457, a novel kinase inhibitor, is active in patients with chronic myeloid leukemia or acute lymphocytic leukemia with the T315I BCR-ABL mutation

FJ Giles, J Cortes, D Jones, D Bergstrom, H Kantarjian… - Blood, 2007 - ashpublications.org
FJ Giles, J Cortes, D Jones, D Bergstrom, H Kantarjian, SJ Freedman
Blood, 2007ashpublications.org
Abstract MK-0457 (VX-680) is a small-molecule aurora kinase (AK) inhibitor with preclinical
antileukemia activity. The T315I BCR-ABL mutation mediates resistance to imatinib, nilotinib,
and dasatinib. MK-0457 has in vitro activity against cells expressing wild-type or mutated
BCR-ABL, including the T315I BCR-ABL mutation. Three patients with T315I abl-mutated
chronic myeloid leukemia (CML) or Philadelphia chromosome (Ph)–positive acute
lymphocytic leukemia (ALL) have achieved clinical responses to doses of MK-04547 that are …
Abstract
MK-0457 (VX-680) is a small-molecule aurora kinase (AK) inhibitor with preclinical antileukemia activity. The T315I BCR-ABL mutation mediates resistance to imatinib, nilotinib, and dasatinib. MK-0457 has in vitro activity against cells expressing wild-type or mutated BCR-ABL, including the T315I BCR-ABL mutation. Three patients with T315I abl-mutated chronic myeloid leukemia (CML) or Philadelphia chromosome (Ph)–positive acute lymphocytic leukemia (ALL) have achieved clinical responses to doses of MK-04547 that are not associated with adverse events. Higher MK-0457 dose levels were associated with clinical responses and down-regulation of CrkL phosphorylation in leukemia cells. The possible role of AK inhibition in these clinical responses requires further investigation. The currently reported cases are the first observed clinical activity of a kinase inhibitor against the T315I phenotype. The observation of responses in 3 patients with T315I phenotype–refractory CML or Ph-positive ALL, at doses of MK-0457 associated with no significant extramedullary toxicity, is very encouraging.
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