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Ref Type Journal Article
PMID (16150941)
Authors Heidel F, Solem FK, Breitenbuecher F, Lipka DB, Kasper S, Thiede MH, Brandts C, Serve H, Roesel J, Giles F, Feldman E, Ehninger G, Schiller GJ, Nimer S, Stone RM, Wang Y, Kindler T, Cohen PS, Huber C, Fischer T
Title Clinical resistance to the kinase inhibitor PKC412 in acute myeloid leukemia by mutation of Asn-676 in the FLT3 tyrosine kinase domain.
Journal Blood
Vol 107
Issue 1
Date 2006 Jan 01
Abstract Text Activating mutations in the FLT3 tyrosine kinase (TK) occur in approximately 35% of patients with acute myeloid leukemia (AML). Therefore, targeting mutated FLT3 is an attractive therapeutic strategy, and early clinical trials testing FLT3 TK inhibitors (TKI) showed measurable clinical responses. Most of these responses were transient; however, in a subset of patients blast recurrence was preceded by an interval of prolonged remission. The etiology of clinical resistance to FLT3-TKI in AML is unclear but is of major significance for the development of future therapeutic strategies. We searched for mechanisms of resistance in 6 patients with AML who had relapses upon PKC412 treatment. In an index AML patient, an algorithm of analyses was applied using clinical material. In vivo and in vitro investigation of primary blasts at relapse revealed persistent TK phosphorylation of FLT3 despite sufficient PKC412 serum levels. Through additional molecular analyses, we identified a single amino acid substitution at position 676 (N676K) within the FLT3 kinase domain as the sole cause of resistance to PKC412 in this patient. Reconstitution experiments expressing the N676K mutant in 32D cells demonstrated that FLT3-ITD-N676K was sufficient to confer an intermediate level of resistance to PKC412 in vitro. These studies point out that a genetically complex malignancy such as AML may retain dependence on a single oncogenic signal.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
FLT3 N676K missense gain of function FLT3 N676K lies within the protein kinase domain of the Flt3 protein ( N676K results in constitutive phosphorylation of Flt3, activation of Akt and Mapk signaling, leading to malignant hematological transformation in animal models (PMID: 26891877), and has been demonstrated to occur as a resistance mutation in the context of FLT3 internal tandem duplication (FLT3-ITD) mutations (PMID: 16150941). Y
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
FLT3 exon 14 ins FLT3 N676K acute myeloid leukemia predicted - resistant Midostaurin Case Reports/Case Series Actionable In a clinical case study, a patient with acute myeloid leukemia harboring a FLT3-ITD mutation progressed on Rydapt (midostaurin) after 288 days and was found to have acquired a FLT3 N676K mutation, and resistance was also confirmed in patient-derived cells in culture (PMID: 16150941). 16150941