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Gene KIT
Variant T670I
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions KIT T670I lies within the ATP pocket in the protein kinase domain of the Kit protein (PMID: 15236194, PMID: 22355224). T670I confers a gain of function on Kit as indicated by constitutive Kit phosphorylation, is transforming in cultured cells, and is associated with resistance to Kit inhibitors (PMID: 17699867, PMID: 15236194).
Associated Drug Resistance Y

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Transcript NM_000222.2
gDNA chr4:g.54729353C>T
cDNA c.2009C>T
Protein p.T670I
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000222 chr4:g.54729353C>T c.2009C>T p.T670I RefSeq GRCh38/hg38
XM_017008178.1 chr4:g.54729353C>T c.2009C>T p.T670I RefSeq GRCh38/hg38
XM_017008178 chr4:g.54729353C>T c.2009C>T p.T670I RefSeq GRCh38/hg38
NM_000222.2 chr4:g.54729353C>T c.2009C>T p.T670I RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT T670I Advanced Solid Tumor sensitive Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT T670I demonstrated sensitivity to Stivarga (regorafenib) treatment in culture, resulting in reduced cell viability (PMID: 33212994). 33212994
KIT T670I Advanced Solid Tumor sensitive Axitinib Preclinical - Cell culture Actionable In a preclinical study, Inlyta (axitinib) inhibited KIT phosphorylation and proliferation of transformed cells expressing KIT T670I in culture, however, with decreased potency compared to its potency against other KIT variants (PMID: 31205508). 31205508
KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT T670I demonstrated sensitivity to Sutent (sunitinib) treatment in culture, resulting in reduced cell viability (PMID: 33212994). 33212994
KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of transformed cells expressing KIT T670I in culture (PMID: 35194937). 35194937
KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of transformed cells expressing KIT T670I in culture (PMID: 31205508). 31205508
KIT T670I melanoma resistant Nilotinib Preclinical Actionable In a preclinical study, melanoma cells expressing KIT T670I demonstrated resistance to treatment with Tasigna (nilotinib) (PMID: 23582185, PMID: 25594040). 23582185 25594040
KIT T670I Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT T670I were resistant to treatment with Gleevec (imatinib) in culture (PMID: 33212994). 33212994
KIT T670I Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT T670I demonstrated resistance to Gleevec (imatinib) in culture (PMID: 35194937). 35194937
KIT T670I gastrointestinal stromal tumor predicted - resistant Avapritinib Phase I Actionable In a Phase I trial, patients with gastrointestinal stromal tumors harboring either KIT V654A or KIT T670I demonstrated decreased overall response rate (0%, 0/25 vs. 26%, 22/84) and increased progressive disease rate (72% vs 23%) compared to those without either KIT mutation when treated with Ayvakit (avapritinib) (PMID: 31270078; NCT02508532). 31270078
KIT T670I Advanced Solid Tumor sensitive Nintedanib Preclinical - Cell line xenograft Actionable In a preclinical study, Ofev (nintedanib) inhibited Kit autophosphorylation and proliferation of transformed cells expressing KIT T670I in culture, and suppressed tumor growth in cell line xenograft models (PMID: 35194937). 35194937
KIT T670I melanoma resistant Dasatinib Preclinical Actionable In a preclinical study, melanoma cells expressing KIT T670I demonstrated resistance to treatment with Sprycel (dasatinib) (PMID: 23582185, PMID: 25594040). 23582185 25594040
KIT T670I melanoma resistant Imatinib Preclinical Actionable In a preclinical study, melanoma cells expressing KIT T670I demonstrated resistance to treatment with Gleevec (imatinib mesylate) (PMID: 23582185, PMID: 25594040). 23582185 25594040
KIT T670I gastrointestinal stromal tumor predicted - resistant Imatinib Case Reports/Case Series Actionable In a clinical case report, a patient with a gastrointestinal stromal tumor developed disease progression while being treated with Gleevec (imatinib), demonstrating a KIT T670I mutation in the progressive lesion (PMID: 15236194). 15236194
KIT T670I Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, cells expressing KIT T670I demonstrated sensitivity to Iclusig (ponatinib) in an in vitro kinase assay (PMID: 25239608). 25239608
KIT T670I melanoma sensitive Sunitinib Preclinical Actionable In a preclinical study, Sutent (sunitinib) demonstrated efficacy by inhibiting proliferation of cultured melanoma cells expressing KIT T670I (PMID: 23582185, PMID: 25594040). 23582185 25594040
KIT T670I Advanced Solid Tumor sensitive Cabozantinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT T670I demonstrated sensitivity to Cometriq (Cabometyx, cabozantinib) treatment in culture, resulting in reduced cell viability (PMID: 33212994). 33212994
KIT W557_K558del KIT T670I Advanced Solid Tumor no benefit Imatinib Preclinical - Cell line xenograft Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT T670I demonstrated no response to treatment with Gleevec (imatinib) in both culture and xenograft models (PMID: 25239608). 25239608
KIT W557_K558del KIT T670I Advanced Solid Tumor resistant Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT T670I demonstrated resistance to Ayvakit (avapritinib) in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT T670I Advanced Solid Tumor resistant Nilotinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing a KIT W557_K558del/T670I double mutation demonstrated resistance to Tasigna (nilotinib) in culture (PMID: 17699867). 17699867
KIT W557_K558del KIT T670I Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT T670I demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT W557_K558del KIT T670I Advanced Solid Tumor decreased response Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT T670I demonstrated a decreased response to treatment with Qinlock (ripretinib) compared to cells expressing KIT W557_K558del alone in culture (PMID: 32350132). 32350132
KIT W557_K558del KIT T670I Advanced Solid Tumor sensitive Sorafenib Preclinical - Cell culture Actionable In a preclinical study, Nexavar (sorafenib) inhibited proliferation and induced apoptosis of transformed cells expressing a KIT W557_K558del/T670I double mutation in culture (PMID: 17699867). 17699867
KIT W557_K558del KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell line xenograft Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT T670I demonstrated sensitivity to treatment with Sutent (sunitinib) in both culture and cell line xenograft models, resulting in reduced cell viability, decreased tumor volume, and tumor regression (PMID: 25239608). 25239608
KIT W557_K558del KIT T670I Advanced Solid Tumor resistant Dasatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing a KIT W557_K558del/T670I double mutation demonstrated resistance to Sprycel (dasatinib) in culture (PMID: 17699867). 17699867
KIT W557_K558del KIT T670I Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT T670I demonstrated sensitivity to treatment with Iclusig (ponatinib) in both culture and cell line xenograft models, resulting in reduced cell viability and decreased tumor volume (PMID: 25239608). 25239608
KIT W557_K558del KIT T670I Advanced Solid Tumor decreased response Regorafenib Preclinical Actionable In a preclinical study, transformed cells co-expressing KIT W557_K558del and KIT T670I demonstrated a decreased response to treatment with Stivarga (regorafenib) compared to cells expressing KIT W557_K558del alone in culture (PMID: 25239608). 25239608
KIT W557_K558del KIT T670I Advanced Solid Tumor decreased response Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT W557_K558del and KIT T670I demonstrated a decreased response to treatment with Stivarga (regorafenib) compared to cells expressing KIT W557_K558del alone in culture (PMID: 32350132). 32350132
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of a gastrointestinal stromal tumor cell line harboring KIT V560_Y578del and KIT T670I in culture (PMID: 31205508). 31205508
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, a patient-derived gastrointestinal stromal tumor (GIST) cell line co-harboring KIT V560_Y578del and KIT T670I demonstrated sensitivity to treatment with Sutent (sunitinib) (PMID: 25239608). 25239608
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, a patient derived GIST cell line co-harboring KIT V560_Y578del and KIT T670I demonstrated sensitivity to treatment with Iclusig (ponatinib) (PMID: 25239608). 25239608
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Axitinib Preclinical - Cell line xenograft Actionable In a preclinical study, Inlyta (axitinib) inhibited KIT phosphorylation and downstream signaling, reduced proliferation, and induced cell-cycle arrest in a gastrointestinal stromal tumor cell line harboring KIT V560_Y578del and KIT T670I in culture, and inhibited tumor growth in xenograft models (PMID: 31205508). 31205508
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Nintedanib Preclinical - Cell line xenograft Actionable In a preclinical study, Ofev (nintedanib) decreased Kit phosphorylation and downstream signaling, induced cell-cycle arrest and apoptosis, and inhibited proliferation of a gastrointestinal stromal tumor cell line harboring KIT V560_Y578del and T670I in culture, and suppressed tumor growth in cell line xenograft models (PMID: 35194937). 35194937
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor sensitive Copanlisib Preclinical - Cell line xenograft Actionable In a preclinical study, Aliqopa (copanlisib) inhibited cell growth and PI3K signaling in a gastrointestinal stromal tumor cell line harboring KIT V560_Y578del and KIT T670I in culture, and inhibited tumor growth in cell line xenograft models (PMID: 32371592). 32371592
KIT V560_Y578del KIT T670I gastrointestinal stromal tumor predicted - sensitive Copanlisib + Imatinib Preclinical - Cell line xenograft Actionable In a preclinical study, the combination of Aliqopa (copanlisib) and Gleevec (imatinib) demonstrated enhanced cell growth inhibition but did not result in increased apoptosis of gastrointestinal stromal tumor cells harboring KIT V560_Y578del and KIT T670I in culture, and did not result in increased tumor growth inhibition compared to Aliqopa (copanlisib) alone in cell line xenograft models (PMID: 32371592). 32371592
KIT V560D KIT T670I Advanced Solid Tumor resistant Flumatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT V560D and KIT T670I were resistant to Flumatinib in culture (PMID: 24205792). 24205792
KIT V560D KIT T670I Advanced Solid Tumor sensitive Motesanib Diphosphate Preclinical - Cell culture Actionable In a preclinical study, Motesanib (AMG 706) inhibited KIT phosphorylation and growth of cells expressing a KIT V560D/T670I double mutation in culture (PMID: 20633291). 20633291
KIT V559D KIT T670I Advanced Solid Tumor sensitive Nintedanib Preclinical - Cell culture Actionable In a preclinical study, Ofev (nintedanib) inhibited proliferation of transformed cells expressing KIT V559D and T670I in culture (PMID: 35194937). 35194937
KIT V559D KIT T670I Advanced Solid Tumor resistant Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V559D and T670I were resistant to Ayvakit (avapritinib) treatment in culture (PMID: 35194937). 35194937
KIT V559D KIT T670I Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V559D and T670I were resistant to Gleevec (imatinib) treatment in culture (PMID: 35194937). 35194937
KIT V559D KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of transformed cells expressing KIT T670I and KIT V559D in culture (PMID: 31205508). 31205508
KIT V559D KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of transformed cells expressing KIT V559D and T670I in culture (PMID: 35194937). 35194937
KIT V559D KIT T670I Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT V559D and KIT T670I were sensitive to treatment with Sutent (sunitinib) in culture, demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT V559D KIT T670I Advanced Solid Tumor resistant Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT V559D and T670I were resistant to Qinlock (ripretinib) treatment in culture (PMID: 35194937). 35194937
KIT exon11 KIT T670I gastrointestinal stromal tumor resistant Imatinib Preclinical - Pdx Actionable In a preclinical study, Gleevec (imatinib mesylate) did not inhibit Kit, Erk signaling and resulted in limited (53.9%) tumor inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT exon 11 mutation (K550_splice) and KIT T670I, which was established from a patient who did not respond to Gleevec (imatinib mesylate) (PMID: 29100343). 29100343
KIT exon11 KIT T670I gastrointestinal stromal tumor predicted - sensitive Sunitinib Preclinical - Pdx Actionable In a preclinical study, Sutent (sunitinib) inhibited Kit signaling, resulted in 86.7% tumor growth inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT exon 11 mutation (K550_splice) and KIT T670I, which was established from a patient who did not respond to Gleevec (imatinib mesylate) (PMID: 29100343). 29100343
KIT exon11 KIT T670I gastrointestinal stromal tumor predicted - sensitive Regorafenib Preclinical - Pdx Actionable In a preclinical study, Stivarga (regorafenib) inhibited Kit signaling, resulted in tumor growth inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT exon 11 mutation (K550_splice) and KIT T670I, which was established from a patient who did not respond to Gleevec (imatinib mesylate) (PMID: 29100343). 29100343
KIT T670I KIT D816V Advanced Solid Tumor decreased response Midostaurin Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT D816V and KIT T670I demonstrated a decreased response compared to cells expressing KIT D816V alone when treated with Rydapt (midostaurin) in culture (PMID: 31270078). 31270078
KIT T670I KIT D816V Advanced Solid Tumor resistant Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells co-expressing KIT D816V and KIT T670I demonstrated resistance to treatment with Ayvakit (avapritinib) in culture (PMID: 31270078). 31270078
KIT exon 11 del KIT T670I gastrointestinal stromal tumor sensitive Avapritinib Preclinical - Cell culture Actionable In a preclinical study, Ayvakit (avapritinib) inhibited proliferation of gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I in culture (PMID: 31085175). 31085175
KIT exon 11 del KIT T670I gastrointestinal stromal tumor decreased response Ripretinib Preclinical - Cell culture Actionable In a preclinical study, gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I demonstrated reduced response to growth inhibition by Qinlock (ripretinib) compared to cells harboring KIT exon 11 deletion alone in culture (PMID: 31085175). 31085175
KIT exon 11 del KIT T670I gastrointestinal stromal tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I were resistant to Gleevec (imatinib) in culture (PMID: 31085175). 31085175
KIT exon 11 del KIT T670I gastrointestinal stromal tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I in culture (PMID: 31085175). 31085175
KIT exon 11 del KIT T670I 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 T670I in culture (Cancer Res 2021;81(13_Suppl):Abstract nr 1292). detail...
KIT exon 11 del KIT T670I gastrointestinal stromal tumor sensitive Midostaurin Preclinical - Cell culture Actionable In a preclinical study, Rydapt (midostaurin) inhibited proliferation of gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I in culture (PMID: 31085175). 31085175
KIT exon 11 del KIT T670I gastrointestinal stromal tumor sensitive Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Sutent (sunitinib) inhibited proliferation of gastrointestinal stromal tumor cells harboring both KIT exon 11 deletion and KIT T670I in culture (PMID: 31085175). 31085175
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 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 not applicable N/A Guideline Diagnostic KIT activating mutations aid the diagnosis of gastrointestinal stromal tumor (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 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 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 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 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 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 7.4 months (Annals of Oncology 32 (2021): S896-S897; NCT02571036). detail...