Gene Variant Detail

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Gene KIT
Variant D820A
Impact List missense
Protein Effect gain of function - predicted
Gene Variant Descriptions KIT D820A lies within the protein kinase domain of the Kit protein (UniProt.org). D820A has been demonstrated to occur as a secondary drug resistance mutation (PMID: 16954519, PMID: 31363162), and results in reduced Kit protein expression and stability, abnormal cellular localization, but constitutive Kit phosphorylation in the absence of Pkc in cell culture (PMID: 27440273), and therefore, is predicted to lead to a gain of Kit protein function.
Associated Drug Resistance Y

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Transcript NM_000222.2
gDNA chr4:g.54733167A>C
cDNA c.2459A>C
Protein p.D820A
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000222 chr4:g.54733167A>C c.2459A>C p.D820A RefSeq GRCh38/hg38
XM_005265741 chr4:g.54733167A>C c.2459A>C p.D820A RefSeq GRCh38/hg38
XM_005265741.1 chr4:g.54733167A>C c.2459A>C p.D820A RefSeq GRCh38/hg38
NM_000222.2 chr4:g.54733167A>C c.2459A>C p.D820A RefSeq GRCh38/hg38

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  • Simple literal full or partial string matches
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  • Use quotes to match a longer phrase which contains spaces "mtor c1483f"

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT V560D KIT D820A Advanced Solid Tumor sensitive Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Stivarga (regorafenib) treatment resulted in decreased viability of transformed cells expressing KIT V560D and KIT D820A in culture, but was less effective compared to other treatments (PMID: 32350132). 32350132
KIT V560D KIT D820A Advanced Solid Tumor resistant Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V560D and KIT D820A demonstrated resistance to Sutent (sunitinib) in culture (PMID: 32350132). 32350132
KIT V560D KIT D820A Advanced Solid Tumor decreased response Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V560D and KIT D820A demonstrated a decreased response to treatment with Ayvakit (avapritinib) compared to cells expressing KIT V560D alone in culture (PMID: 32350132). 32350132
KIT V560D KIT D820A Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V560D and KIT D820A demonstrated resistance to Gleevec (imatinib) in culture (PMID: 32350132). 32350132
KIT V560D KIT D820A Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V560D and KIT D820A demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT V560D KIT D820A gastrointestinal stromal tumor resistant Imatinib Preclinical Actionable In a preclinical study, a gastrointestinal stromal tumor cell line harboring KIT V560D and KIT D820A demonstrated resistance to Gleevec (imatinib) in culture (PMID: 16954519). 16954519
KIT V560D KIT D820A gastrointestinal stromal tumor resistant Imatinib Case Reports/Case Series Actionable In a clinical study, KIT D820A was identified as a secondary mutation in a patient with gastrointestinal stromal tumor harboring a primary KIT V560D mutation, who developed resistance to Gleevec (imatinib mesylate) (PMID: 16954519). 16954519
KIT V560D KIT D820A Advanced Solid Tumor sensitive Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V560D and KIT D820A demonstrated sensitivity to Qinlock (ripretinib) in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT V560D KIT D820A gastrointestinal stromal tumor resistant Sunitinib Preclinical Actionable In a preclinical study, a gastrointestinal stromal tumor cell line harboring KIT V560D and KIT D820A demonstrated resistance to Sutent (sunitinib) in culture (PMID: 18955458). 18955458
KIT W557_K558del KIT D820A Advanced Solid Tumor resistant Imatinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT D820A were resistant to Gleevec (imatinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT D820A Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT D820A demonstrated resistance to Gleevec (imatinib) in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT D820A Advanced Solid Tumor resistant Sunitinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT D820A were resistant to Sutent (sunitinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT D820A Advanced Solid Tumor resistant Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT D820A demonstrated resistance to Sutent (sunitinb) in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT D820A Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT D820A were sensitive to Iclusig (ponatinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT D820A 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 D820A in culture, but was less effective compared to other treatments (PMID: 32350132). 32350132
KIT W557_K558del KIT D820A Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT D820A demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT W557_K558del KIT D820A Advanced Solid Tumor sensitive Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT D820A demonstrated sensitivity to Qinlock (ripretinib) in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT W557_K558del KIT D820A Advanced Solid Tumor conflicting Regorafenib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT D820A were resistant to Stivarga (regorafenib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT W557_K558del KIT D820A Advanced Solid Tumor conflicting Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT D820A were sensitive to treatment with Stivarga (regorafenib), demonstrating reduced cell viability in culture (PMID: 32350132). 32350132
KIT exon 11 del KIT D820A 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 D820A in culture (Cancer Res 2021;81(13_Suppl):Abstract nr 1292). detail...
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
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...
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 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 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 7.4 months (Annals of Oncology 32 (2021): S896-S897; NCT02571036). detail...
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 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 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 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 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 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 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 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 gastrointestinal stromal tumor not applicable N/A Guideline Diagnostic KIT activating mutations aid the diagnosis of gastrointestinal stromal tumor (NCCN.org). 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
Molecular Profile Protein Effect Treatment Approaches
KIT D820A gain of function - predicted KIT Inhibitor
KIT V560D KIT D820A
KIT W557_K558del KIT D820A
KIT exon 11 del KIT D820A