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Gene KIT
Variant V654A
Impact List missense
Protein Effect unknown
Gene Variant Descriptions KIT V654A lies within the protein kinase domain (exon 13) of the Kit protein (UniProt.org). V654A has been described as a secondary drug resistance mutation (PMID: 17363509, PMID: 16751810), but has conflicting functional data, as in some studies, results in increased proliferation in cultured cells and in murine cells (corresponding to V653A), leads to increased proliferation and elevated Stat activation in the context of KIT V559del (corresponding to V558del in mouse) in culture (PMID: 33024275), is constitutively phosphorylated in culture (PMID: 27440273), but in another study is not transforming and does not result in constitutive activation (PMID: 17363509), and therefore, its effect on Kit protein function is unknown.
Associated Drug Resistance Y
Category Variants Paths

KIT mutant KIT exon13 KIT V654X KIT V654A

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Transcript NM_000222.3
gDNA chr4:g.54728092T>C
cDNA c.1961T>C
Protein p.V654A
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
XM_017008178 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38
NM_000222.3 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38
NM_000222 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38
NM_001385285.1 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38
NM_000222.2 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38
XM_017008178.1 chr4:g.54728092T>C c.1961T>C p.V654A RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT exon13 gastrointestinal stromal tumor sensitive Imatinib + MK2206 Preclinical - Cell culture Actionable In a preclinical study, the combination of Gleevec (imatinib) and MK2206 demonstrated synergy in inhibiting growth of a gastrointestinal stromal tumor cell line harboring a KIT exon 13 mutation in culture (PMID: 27370604). 27370604
KIT exon13 melanoma not predictive Pembrolizumab Clinical Study Actionable In a retrospective analysis, real-world treatment with either Keytruda (pembrolizumab) or Toripalimab (JS001) resulted in a median disease-free survival of 33 months in melanoma patients harboring KIT mutations in either exon 11 (64.8%), exon 13 (17.6%), or exon 17 (17.6%) compared to 32 months in patients with wild-type BRAF, NRAS, and KIT (p=0.200) (PMID: 37403699). 37403699
KIT exon13 melanoma sensitive Regorafenib Case Reports/Case Series Actionable In a Phase II trial, second or later-line Stivarga (regorafenib) treatment resulted in a disease control rate of 73.9% (17/23, 2 complete responses, 5 partial responses), an objective response rate of 30.4% (7/23), and median overall survival (mOS) of 21.5 months in patients with melanoma harboring KIT exon 9, 11, 13, or 17 mutations, and improved mOS in patients with non-exon 11 mutations compared to patients with exon 11 mutations (24.9 mo vs 18.3 mo, P=0.042) (PMID: 37741071; NCT02501551). 37741071
KIT exon13 melanoma not predictive Toripalimab-tpzi Clinical Study Actionable In a retrospective analysis, real-world treatment with either Keytruda (pembrolizumab) or Loqtorz (toripalimab-tpzi) resulted in a median disease-free survival of 33 months in melanoma patients harboring KIT mutations in either exon 11 (64.8%), exon 13 (17.6%), or exon 17 (17.6%) compared to 32 months in patients with wild-type BRAF, NRAS, and KIT (p=0.200) (PMID: 37403699). 37403699
KIT exon13 gastrointestinal stromal tumor sensitive Adavosertib + Avapritinib Preclinical - Cell culture Actionable In a preclinical study, the combination of Adavosertib (MK-1775) and Ayvakit (avapritinib) synergized to inhibit growth of a gastrointestinal stromal tumor cell line harboring a KIT exon 13 mutation in culture (PMID: 33320833). 33320833
KIT exon13 melanoma sensitive Nilotinib Phase II Actionable In a Phase II trial, Tasigna (nilotinib) treatment resulted in complete response in 5% (1/19) and partial response in 21% (4/19) of melanoma patients harboring KIT exon 11 or exon 13 mutations (PMID: 28843487; NCT01168050). 28843487
KIT exon13 melanoma sensitive Nilotinib Phase II Actionable In a Phase II trial, Tasigna (nilotinib) resulted in an overall response rate of 26.2% (11/41), which included a partial response in 7.7% (1/13) of melanoma patients harboring KIT exon 13 mutations (PMID: 28327988). 28327988
KIT mutant gastrointestinal stromal tumor sensitive Imatinib + Infigratinib Preclinical - Pdx Actionable In a preclinical study, Truseltiq (infigratinib) and Gleevec (imatinib) combination treatment demonstrated enhanced antitumor activity in patient derived xenograft models of gastrointestinal stromal tumor harboring KIT mutations (PMID: 25673643). 25673643
KIT mutant gastrointestinal stromal tumor predicted - sensitive Ripretinib Phase I Actionable In a Phase I trial, Qinlock (ripretinib) was well tolerated, resulted in an objective response in 11.3% (16/142, 16 partial responses) and stable disease in 61.3% (87/142) of patients with advanced gastrointestinal stromal tumor harboring KIT (exon 11, n=103; exon 9, n=26; other, n=6) or PDGFRA mutations (n=7), with a median progression-free survival of 5.6 months (PMID: 32804590; NCT02571036). 32804590
KIT mutant gastrointestinal stromal tumor predicted - sensitive Ripretinib Phase I Actionable In a Phase I trial, Qinlock (ripretinib) demonstrated preliminary safety and efficacy in patients with advanced solid tumors, including KIT-mutant gastrointestinal stromal tumor (GIST), with 1 patient harboring KIT exon 11 and 17 mutations demonstrating a partial response, and 7/7 KIT-mutant GIST patients demonstrating a partial metabolic response (EORTC-NCI-AACR 2016, Abs 7LBA). detail...
KIT mutant gastrointestinal stromal tumor not applicable N/A Clinical Study Diagnostic KIT mutations are used in the diagnosis of gastrointestinal stromal tumors (PMID: 25193432, PMID: 26276366, PMID: 25729899). 25193432 26276366 25729899
KIT mutant gastrointestinal stromal tumor predicted - sensitive Avapritinib Phase I Actionable In a Phase I (NAVIGATOR) trial, Ayvakit (avapritinib) treatment resulted in an objective response rate of 13% (7/52, 7 partial responses) and a disease control rate of 63% (33/52) in patients with KIT-mutant gastrointestinal stromal tumor (The CTOS 2018 Annual Meeting, Nov 14-17, Rome Italy, Paper 012 3027631; NCT02508532). detail...
KIT mutant melanoma sensitive Nilotinib Phase II Actionable In a Phase II trial, Tasigna (nilotinib) treatment in patients with melanoma harboring KIT mutations resulted in an overall response rate of 26.2% (11/42), which included 11 patients with a partial response, a median duration of response of 7.1 months, and an overall survival of 18 months (PMID: 28327988; NCT01028222). 28327988
KIT mutant melanoma sensitive Nilotinib Phase II Actionable In a Phase II trial, Tasigna (nilotinib) treatment resulted in complete response in 4% (1/25), durable partial response in 16% (4/25), and stable disease in 56% (14/25) of melanoma patients harboring KIT mutations (PMID: 28843487; NCT01168050). 28843487
KIT mutant melanoma predicted - sensitive Ripretinib Phase I Actionable In a Phase I trial, Qinlock (ripretinib) treatment demonstrated manageable safety and preliminary efficacy in patients with KIT-mutated melanoma, and led to an objective response rate of 23% (6/26, 1 complete and 5 partial responses), a median progression-free survival of 7.3 months, and a median duration of response of 9.1 months (PMID: 35753087; NCT02571036). 35753087