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Gene KIT
Variant N822K
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions KIT N822K lies within the activation loop in the protein kinase domain of the Kit protein (PMID: 24205792). N822K results in constitutive activation of Kit, increased Erk1/2 and Stat3 phosphorylation, is transforming in culture (PMID: 24205792, PMID: 31484543), leads to mislocalization of Kit to endolysosomes (PMID: 31484543), and has been identified as a secondary mutation associated with imatinib resistance (PMID: 18488160).
Associated Drug Resistance Y

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Transcript NM_000222.2
gDNA chr4:g.54733174T>G
cDNA c.2466T>G
Protein p.N822K
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000222.2 chr4:g.54733174T>G c.2466T>G p.N822K RefSeq GRCh38/hg38
NM_000222 chr4:g.54733174T>G c.2466T>G p.N822K RefSeq GRCh38/hg38
XM_005265741 chr4:g.54733174T>G c.2466T>G p.N822K RefSeq GRCh38/hg38
XM_005265741.1 chr4:g.54733174T>G c.2466T>G p.N822K RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT N822K Advanced Solid Tumor predicted - sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT N822K were more sensitive to treatment with Sutent (sunitinib) in culture compared to Gleevec (imatinib), demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT N822K acute myeloid leukemia sensitive Ripretinib Preclinical - Cell culture Actionable In a preclinical study, Qinlock (ripretinib) inhibited proliferation of acute myeloid leukemia cells harboring KIT N822K in culture (PMID: 31085175). 31085175
KIT N822K acute myeloid leukemia sensitive Ripretinib Preclinical - Pdx Actionable In a preclinical study, Qinlock (ripretinib) induced tumor regression in a patient-derived xenograft (PDX) model of acute myeloid leukemia harboring KIT N822K (Cancer Res 2015;75(15 Suppl):Abstract nr 2690). detail...
KIT N822K hematologic cancer sensitive Crenolanib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT N822K were sensitive to treatment with Crenolanib in culture, demonstrating reduced cell survival (PMID: 31182436). 31182436
KIT N822K hematologic cancer sensitive Dasatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT N822K were sensitive to treatment with Sprycel (dasatinib) in culture, demonstrating reduced cell survival (PMID: 31182436). 31182436
KIT N822K Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT N822K were resistant to treatment with Gleevec (imatinib) in culture (PMID: 24205792). 24205792
KIT N822K acute myeloid leukemia decreased response Imatinib Preclinical - Cell culture Actionable In a preclinical study, acute myeloid leukemia cells harboring KIT N822K demonstrated reduced response to growth inhibition by Gleevec (imatinib) compared to GIST cells harboring KIT exon 11 deletion in culture (PMID: 31085175). 31085175
KIT N822K acute myeloid leukemia sensitive Midostaurin Preclinical - Cell culture Actionable In a preclinical study, Rydapt (midostaurin) inhibited proliferation of acute myeloid leukemia cells harboring KIT N822K in culture (PMID: 31085175). 31085175
KIT N822K mucosal melanoma predicted - sensitive Avapritinib Case Reports/Case Series Actionable In a clinical case study, Ayvakit (avapritinib) resulted in a partial response in extracranial lesions and stable disease in the central nervous lesions that lasted for 11 months in a patient with mucosal melanoma harboring KIT N822K (PMID: 35820244). 35820244
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
KIT N822K gastrointestinal stromal tumor predicted - resistant Imatinib Case Reports/Case Series Actionable In a clinical case study, KIT N822K was identified in the tumor of a gastrointestinal stromal tumor patient who was resistant to Gleevec (imatinib) treatment (PMID: 26316776). 26316776
KIT N822K thymus squamous cell carcinoma predicted - sensitive Avapritinib Case Reports/Case Series Actionable In a clinical case study, Ayvakit (avapritinib) resulted in stable disease in a patient with thymus squamous cell carcinoma harboring KIT N822K (PMID: 35820244). 35820244
KIT N822K acute myeloid leukemia predicted - sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of acute myeloid leukemia cells harboring KIT N822K in culture (PMID: 31085175). 31085175
KIT N822K acute myeloid leukemia predicted - sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, an acute myeloid leukemia cell line harboring KIT N822K demonstrated increased sensitivity to Sutent (sunitinib) compared to cells with wild-type KIT, resulting in increased inhibition of colony formation, and induction of cell-cycle arrest, apoptosis, and autophagy in culture (PMID: 31217744). 31217744
KIT N822K acute myeloid leukemia sensitive Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Stivarga (regorafenib) inhibited proliferation of acute myeloid leukemia cells harboring KIT N822K in culture (PMID: 31085175). 31085175
KIT N822K acute myeloid leukemia sensitive Avapritinib Preclinical - Cell culture Actionable In a preclinical study, Ayvakit (avapritinib) inhibited Kit phosphorylation and proliferation of acute myeloid leukemia cells harboring KIT N822K in culture (PMID: 29093181). 29093181
KIT N822K Advanced Solid Tumor predicted - sensitive Flumatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT N822K were more sensitive to treatment with Flumatinib in culture compared to Gleevec (imatinib), demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT N822K acute myeloid leukemia sensitive BPR1J373 Preclinical - Cell line xenograft Actionable In a preclinical study, an acute myeloid leukemia cell line harboring KIT N822K demonstrated sensitivity to treatment with BPR1J373, showing inhibition of Kit phosphorylation and apoptotic induction in culture, and tumor regression in xenograft models (PMID: 27512117). 27512117
KIT W557_K558del KIT N822K Advanced Solid Tumor sensitive Avapritinib Preclinical - Cell culture Actionable In a preclinical study, Ayvakit (avapritinib) treatment resulted in decreased viability of transformed cells expressing KIT W557_K558del and KIT N822K in culture, but was less effective compared to other treatments (PMID: 32350132). 32350132
KIT W557_K558del KIT N822K Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT N822K demonstrated resistance to Gleevec (imatinib) in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT N822K Advanced Solid Tumor resistant Imatinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT N822K were resistant to Gleevec (imatinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT N822K Advanced Solid Tumor conflicting Regorafenib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT N822K were resistant to Stivarga (regorafenib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT N822K Advanced Solid Tumor conflicting Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT N822K was sensitive to treatment with Stivarga (regorafenib), demonstrating decreased cell viability in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT N822K Advanced Solid Tumor sensitive Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT N822K demonstrated sensitivity to Qinlock (ripretinib) in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT W557_K558del KIT N822K Advanced Solid Tumor resistant Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT N822K demonstrated resistance to Sutent (sunitinib) in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT N822K Advanced Solid Tumor resistant Sunitinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT N822K were resistant to Sutent (sunitinb) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT N822K gastrointestinal stromal tumor predicted - resistant Binimetinib + Imatinib Case Reports/Case Series Actionable In a Phase II trial, KIT N822K was identified as a secondary resistance mutation in a patient with a gastrointestinal stromal tumor harboring a primary KIT W557_K558del mutation who developed resistance to Gleevec (imatinib) and Mektovi (binimetinib) (PMID: 35041493; NCT01991379). 35041493
KIT W557_K558del KIT N822K Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT N822K were sensitive to Iclusig (ponatinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT N822K Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT N822K demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT V559D KIT N822K Advanced Solid Tumor no benefit Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT N822K and KIT V559D were insensitive to Sutent (sunitinib) in culture (PMID: 24205792). 24205792
KIT V559D KIT N822K Advanced Solid Tumor sensitive Flumatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT N822K and KIT V559D were sensitive to Flumatinib in culture, demonstrating decreased cell proliferation and inhibition of Kit, Erk 1/2, and Stat3 phosphorylation (PMID: 24205792). 24205792
KIT A502_Y503dup KIT N822K gastrointestinal stromal tumor predicted - resistant Imatinib Case Reports/Case Series Actionable In a clinical study, KIT N822K was identified as a secondary mutation in a patient with gastrointestinal stromal tumor harboring a primary KIT A502_Y503dup mutation, who developed resistance to Gleevec (imatinib) (PMID: 18488160). 18488160
KIT W557_K558delinsCE KIT N822K gastrointestinal stromal tumor predicted - resistant Imatinib Case Reports/Case Series Actionable In a clinical study, KIT N822K was identified as a secondary mutation in a patient with gastrointestinal stromal tumor harboring a primary KIT W557_K558delinsCE mutation, who developed resistance to Gleevec (imatinib mesylate) (PMID: 18488160). 18488160
KIT V569_L576del KIT V654A KIT N822K gastrointestinal stromal tumor predicted - resistant Imatinib Case Reports/Case Series Actionable In a clinical study, KIT V654A and KIT N822K were identified as secondary mutations in a patient with gastrointestinal stromal tumor harboring a primary KIT V569_L576del mutation, who developed resistance to Gleevec (imatinib) (PMID: 18488160). 18488160
KIT K642E KIT N822K gastrointestinal stromal tumor sensitive Regorafenib Preclinical - Pdx Actionable In a preclinical study, Stivarga (regorafenib) suppressed tumor growth in a patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT K642E and KIT N822K, but was less potent in comparison to treatment with AZD3229 (PMID: 32350132). 32350132
KIT K642E KIT N822K gastrointestinal stromal tumor sensitive AZD3229 Preclinical - Pdx Actionable In a preclinical study, AZD3229 inhibited Kit signaling and tumor growth in a patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT K642E and KIT N822K (PMID: 32350132). 32350132
KIT exon 11 del KIT N822K Advanced Solid Tumor predicted - sensitive THE-630 Preclinical - Cell culture Actionable In a preclinical study, THE-630 treatment inhibited growth of cells co-expressing a KIT exon 11 deletion and KIT N822K in culture (Cancer Res 2021;81(13_Suppl):Abstract nr 1292). detail...
KIT V560D KIT D820G KIT N822K KIT Y870* gastrointestinal stromal tumor predicted - resistant Binimetinib + Imatinib Case Reports/Case Series Actionable In a Phase II trial, KIT N822K and KIT D820G were identified as secondary resistance mutations in a patient with a gastrointestinal stromal tumor harboring primary KIT Y870* and V560D mutations who developed resistance to Gleevec (imatinib) and Mektovi (binimetinib) treatment (PMID: 35041493; NCT01991379). 35041493
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT act mut skin melanoma sensitive Imatinib Guideline Actionable Gleevec (imatinib) is included in guidelines as second-line therapy for metastatic or unresectable cutaneous melanoma patients with KIT activating mutations (NCCN.org). detail...
KIT act mut Advanced Solid Tumor sensitive PLX9486 Preclinical Actionable In a preclinical study, PLX9486 inhibited KIT mutations, including exon 17 mutations, and demonstrated in vivo and in vitro activity against tumors harboring KIT exon 17 mutations (Cancer Res February 1, 2016 76; IA32). detail...
KIT act mut gastrointestinal stromal tumor sensitive Pexidartinib Preclinical - Cell line xenograft Actionable In a preclinical study, PLX3397 inhibited growth of gastrointestinal stromal tumor cell lines harboring KIT activating mutations in culture and in cell line xenograft models (PMID: 24583793). 24583793
KIT act mut gastrointestinal stromal tumor sensitive Cabozantinib Preclinical Actionable In a preclinical study, Cometriq (cabozantinib) decreased cell viability in imatinib-sensitive and resistant gastrointestinal stromal tumor (GIST) cell lines harboring KIT activating mutations in culture, and induced tumor regression in KIT-mutant GIST mouse models (PMID: 25836719). 25836719
KIT act mut gastrointestinal stromal tumor not applicable N/A Guideline Diagnostic KIT activating mutations aid the diagnosis of gastrointestinal stromal tumor (NCCN.org). detail...
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 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 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 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
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 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 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 exon17 gastrointestinal stromal tumor predicted - sensitive PLX9486 Phase I Actionable In a Phase I trial, PLX9486 demonstrated safety and preliminary efficacy, resulted in a progression-free survival of more than 24 weeks and partial response in 8.3% (2/24) of patients with advanced solid tumors, 20 of these patients had gastrointestinal stromal tumor that progressed on Gleevec (imatinib mesylate), and most harbored KIT exon 11 and exon 17 mutations (Journal of Clinical Oncology 36, no. 15_suppl (May 20 2018) 11509-11509; NCT02401815). detail...
KIT exon17 gastrointestinal stromal tumor predicted - sensitive Pexidartinib + PLX9486 Phase I Actionable In a Phase I trial, PLX9486 and Pexidartinib (PLX3397) combination therapy demonstrated safety and preliminary efficacy, resulted in a partial response rate of 8.3% (1/12) and progression-free survival not yet reached in patients with advanced solid tumors, 11 of these patients had gastrointestinal stromal tumor that progressed on Gleevec (imatinib mesylate), and most harbored KIT exon 11 and exon 17 mutations (Journal of Clinical Oncology 36, no. 15_suppl (May 20 2018) 11509-11509; NCT02401815). detail...
KIT exon17 mucosal melanoma predicted - sensitive Avapritinib Case Reports/Case Series Actionable In a clinical case study, Ayvakit (avapritinib) resulted in a reduction of the metastatic lesions, including brain metastases, in a patient with mucosal melanoma harboring a KIT exon 17 mutation (PMID: 35820244). 35820244
KIT exon17 Advanced Solid Tumor sensitive Avapritinib Preclinical Actionable In a preclinical study, Ayvakit (avapritinib) inhibited Kit phosphorylation and proliferation of various tumor cell lines harboring KIT exon 17 mutations in culture, and induced tumor regression in an allograft animal model (PMID: 29093181). 29093181
KIT exon17 gastrointestinal stromal tumor sensitive Avapritinib Phase I Actionable In a Phase I trial, Ayvakit (avapritinib) demonstrated preliminary antitumor activity in gastrointestinal stromal tumor patients harboring KIT mutations, with reduced tumor burden in 38% (5/13) of patients, including 1 partial response and 4 stable diseases, and 3 of the 5 responding patients harbored KIT exon 17 mutations (EORTC-NCI-AACR 2016, Abs 6LBA). detail...