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Ref Type Journal Article
PMID (23567324)
Authors Conca E, Miranda C, Dal Col V, Fumagalli E, Pelosi G, Mazzoni M, Fermeglia M, Laurini E, Pierotti MA, Pilotti S, Greco A, Pricl S, Tamborini E
Title Are two better than one? A novel double-mutant KIT in GIST that responds to Imatinib.
Journal Vol Issue Date Pages Journal Short Title
Molecular oncology 7 4 2013 Aug 756-62 Mol Oncol
URL
Abstract Text Gastrointestinal stromal tumors carry in about 85% of the cases activating mutations in KIT gene. Generally only one KIT mutation is found in primary tumors and the majority of mutations affecting KIT exon 11 is sensitive to Imatinib. We report upon a GIST case harboring a double-mutant KIT gene at exon 11, which expresses a receptor bearing the known activating W557G mutation and a newly discovered missense Y578C alteration. The relative affinities for ATP and Imatinib of each single (W557G, Y578C) and double (W557G/Y578C) mutant KITs were predicted by in silico studies (computer-based molecular simulations), and compared with those obtained for known Imatinib sensitive and resistant KIT mutants. In parallel, biochemical analysis of the single and double KIT mutants expressed in mammalian cells was performed. Both the in-silico/in-vitro investigations showed constitutive activation and sensitivity to Imatinib of the yet mentioned Y578C mutation as well as of the double mutant, providing evidence that the concomitant presence of the W557G and Y578C mutations does not affect Imatinib response compare to the single mutations, in line with what observed in Imatinib treated patient.

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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
KIT W557G missense gain of function - predicted KIT W557G lies within the juxtamembrane domain (exon 11) of the Kit protein (PMID: 16226710). W557G results in constitutive phosphorylation of Kit in cell culture (PMID: 23567324), and therefore, is predicted to lead to a gain of Kit protein function.
KIT Y578C missense gain of function - predicted KIT Y578C lies within the juxtamembrane domain (exon 11) of the Kit protein (PMID: 16226710). Y578C results in constitutive phosphorylation of Kit in cell culture (PMID: 23567324), and therefore, is predicted to lead to a gain of Kit protein function.
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT W557G Advanced Solid Tumor sensitive Imatinib Preclinical Actionable In a preclinical study, Gleevec (imatinib mesylate) inhibited Kit phosphorylation efficiently in transformed human cells over expressing KIT W557G in culture (PMID: 23567324). 23567324
KIT W557C KIT Y578C Advanced Solid Tumor sensitive Imatinib Preclinical Actionable In a preclinical study, Gleevec (imatinib mesylate) inhibited Kit phosphorylation efficiently in transformed human cells over expressing both KIT W557C and KIT Y578C in culture (PMID: 23567324). 23567324
KIT Y578C Advanced Solid Tumor sensitive Imatinib Preclinical Actionable In a preclinical study, Gleevec (imatinib mesylate) inhibited Kit phosphorylation efficiently in transformed human cells over expressing KIT Y578C in culture (PMID: 23567324). 23567324