Reference Detail

Ref Type Journal Article
PMID (27777285)
Authors Gebreyohannes YK, Schöffski P, Van Looy T, Wellens J, Vreys L, Cornillie J, Vanleeuw U, Aftab DT, Debiec-Rychter M, Sciot R, Wozniak A
Title Cabozantinib Is Active against Human Gastrointestinal Stromal Tumor Xenografts Carrying Different KIT Mutations.
Journal Molecular cancer therapeutics
Vol 15
Issue 12
Date 2016 Dec
URL
Abstract Text In the majority of gastrointestinal stromal tumors (GIST), oncogenic signaling is driven by KIT mutations. Advanced GIST is treated with tyrosine kinase inhibitors (TKI) such as imatinib. Acquired resistance to TKI is mainly caused by secondary KIT mutations, but can also be attributed to a switch of KIT dependency to another receptor tyrosine kinase (RTK). We tested the efficacy of cabozantinib, a novel TKI targeting KIT, MET, AXL, and vascular endothelial growth factor receptors (VEGFR), in patient-derived xenograft (PDX) models of GIST, carrying different KIT mutations. NMRI nu/nu mice (n = 52) were bilaterally transplanted with human GIST: UZLX-GIST4 (KIT exon 11 mutation, imatinib sensitive), UZLX-GIST2 (KIT exon 9, imatinib dose-dependent resistance), or UZLX-GIST9 (KIT exon 11 and 17 mutations, imatinib resistant). Mice were grouped as control (untreated), imatinib (50 mg/kg/bid), and cabozantinib (30 mg/kg/qd) and treated orally for 15 days. Cabozantinib resulted in significant tumor regression in UZLX-GIST4 and -GIST2 and delayed tumor growth in -GIST9. In all three models, cabozantinib inhibited the proliferative activity, which was completely absent in UZLX-GIST4 and significantly reduced in -GIST2 and -GIST9. Increased apoptotic activity was observed only in UZLX-GIST4. Cabozantinib inhibited the KIT signaling pathway in UZLX-GIST4 and -GIST2. In addition, compared with both control and imatinib, cabozantinib significantly reduced microvessel density in all models. In conclusion, cabozantinib showed antitumor activity in GIST PDX models through inhibition of tumor growth, proliferation, and angiogenesis, in both imatinib-sensitive and imatinib-resistant models. Mol Cancer Ther; 15(12); 2845-52. ©2016 AACR.

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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
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 P577del KIT W557Lfs*5 KIT D820G gastrointestinal stromal tumor resistant Imatinib Preclinical - Pdx Actionable In a preclinical study, a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT mutations, P577del, W557Lfs*5, and D820G, demonstrated resistance to treatment with Gleevec (imatinib) (PMID: 27777285). 27777285
KIT K558_G565delinsR gastrointestinal stromal tumor sensitive Cabozantinib Preclinical - Pdx Actionable In a preclinical study, Cometriq (Cabometyx, cabozantinib) resulted in tumor regression, decreased mitotic activity, and increased apoptotic activity in a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT K558_G565delins (PMID: 27777285). 27777285
KIT K558_G565delinsR gastrointestinal stromal tumor sensitive Imatinib Preclinical - Pdx Actionable In a preclinical study, Gleevec (imatinib) treatment resulted in tumor regression and decreased mitotic activity in gastrointestinal stromal tumor patient derived xenograft (PDX) models harboring KIT K558_G565delinsR (PMID: 27777285). 27777285
KIT A502_Y503dup gastrointestinal stromal tumor sensitive Cabozantinib Preclinical - Pdx Actionable In a preclinical study, Cometriq (Cabometyx, cabozantinib) resulted in decreased tumor volume and reduced mitotic activity in a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT A502_Y503dup (PMID: 27777285). 27777285
KIT A502_Y503dup gastrointestinal stromal tumor resistant Imatinib Preclinical - Pdx Actionable In a preclinical study, a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT A502_Y503dup demonstrated resistance to treatment with Gleevec (imatinib), resulting in increased tumor volume (PMID: 27777285). 27777285
KIT P577del KIT W557Lfs*5 KIT D820G gastrointestinal stromal tumor sensitive Cabozantinib Preclinical - Pdx Actionable In a preclinical study, Cometriq (Cabometyx, cabozantinib) slowed tumor growth and decreased mitotic activity in a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT mutations, P577del, W557Lfs*5, and D820G (PMID: 27777285). 27777285