Reference Detail

Ref Type

Journal Article

PMID

(21482694)

Authors

Gozgit JM, Wong MJ, Wardwell S, Tyner JW, Loriaux MM, Mohemmad QK, Narasimhan NI, Shakespeare WC, Wang F, Druker BJ, Clackson T, Rivera VM

Title

Potent activity of ponatinib (AP24534) in models of FLT3-driven acute myeloid leukemia and other hematologic malignancies.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Molecular cancer therapeutics	10	6	2011 Jun	1028-35	Mol Cancer Ther

URL

Abstract Text

Ponatinib (AP24534) is a novel multitargeted kinase inhibitor that potently inhibits native and mutant BCR-ABL at clinically achievable drug levels. Ponatinib also has in vitro inhibitory activity against a discrete set of kinases implicated in the pathogenesis of other hematologic malignancies, including FLT3, KIT, fibroblast growth factor receptor 1 (FGFR1), and platelet derived growth factor receptor α (PDGFRα). Here, using leukemic cell lines containing activated forms of each of these receptors, we show that ponatinib potently inhibits receptor phosphorylation and cellular proliferation with IC50 values comparable to those required for inhibition of BCR-ABL (0.3 to 20 nmol/L). The activity of ponatinib against the FLT3-ITD mutant, found in up to 30% of acute myeloid leukemia (AML) patients, was particularly notable. In MV4-11 (FLT3-ITD(+/+)) but not RS4;11 (FLT3-ITD(-/-)) AML cells, ponatinib inhibited FLT3 signaling and induced apoptosis at concentrations of less than 10 nmol/L. In an MV4-11 mouse xenograft model, once daily oral dosing of ponatinib led to a dose-dependent inhibition of signaling and tumor regression. Ponatinib inhibited viability of primary leukemic blasts from a FLT3-ITD positive AML patient (IC50 4 nmol/L) but not those isolated from 3 patients with AML expressing native FLT3. Overall, these results support the investigation of ponatinib in patients with FLT3-ITD-driven AML and other hematologic malignancies driven by KIT, FGFR1, or PDGFRα.

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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

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
KIT N822K	leukemia	sensitive	Ponatinib	Preclinical - Cell culture	Actionable	In a preclinical study, Iclusig (ponatinib) inhibited Kit signaling and viability in leukemia cells harboring KIT N822K in culture (PMID: 21482694).	21482694
FLT3 exon 14 ins	acute myeloid leukemia	sensitive	Ponatinib	Preclinical - Patient cell culture	Actionable	In a preclinical study, Iclusig (ponatinib) inhibited viability of patient derived acute myeloid leukemia cells harboring FLT3 ITD mutations in culture, and inhibited growth of tumors in cell line xenograft models (PMID: 21482694).	21482694