Gene Variant Detail

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Gene KIT
Variant A502_Y503dup
Impact List duplication
Protein Effect gain of function
Gene Variant Descriptions KIT A502_Y503dup (also referred to as Y503_F504insAY) indicates the insertion of 2 duplicate amino acids, alanine (A)-502 through tyrosine (Y)-503, in the Ig-like C2-type domain 5 (exon 9) of the Kit protein (UniProt.org). A502_Y503dup results in constitutive phosphorylation of Kit and is transforming in cell culture (PMID: 15790786, PMID: 19865100).
Associated Drug Resistance

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Transcript NM_000222.2
gDNA chr4:g.54726014_54726019
cDNA c.1504_1509
Protein p.A502_Y503
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
XM_017008180 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
NM_001093772.1 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
NM_000222 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
XM_017008178 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
NM_000222.2 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
XM_017008180.1 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
XM_017008178.1 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38
NM_001093772 chr4:g.54726014_54726019 c.1504_1509 p.A502_Y503 RefSeq GRCh38/hg38

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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 A502_Y503dup gastrointestinal stromal tumor sensitive Avapritinib Preclinical - Pdx Actionable In a preclinical study, a patient derived xenograft (PDX) model with a gastrointestinal stromal tumor harboring KIT A502_Y503dup was sensitive to treatment with Ayvakit (avapritinib), demonstrating a 90% stabilized tumor volume at a dose of 30mg/kg and tumor regression at a dose of 60mg/kg, and inhibition of cell proliferation (PMID: 30274985). 30274985
KIT A502_Y503dup Advanced Solid Tumor sensitive Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup (Y503_F504insAY) were sensitive to Gleevec (imatinib) in culture, demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT A502_Y503dup Advanced Solid Tumor sensitive Ripretinib Preclinical - Cell culture Actionable In a preclinical study, Qinlock (ripretinib) treatment resulted in decreased cell viability and reduced KIT signaling in transformed cells expressing KIT A502_Y503dup in culture, but was less potent compared to treatment with AZD3229 (PMID: 32350132). 32350132
KIT A502_Y503dup gastrointestinal stromal tumor resistant Imatinib Preclinical - Pdx Actionable In a preclinical study, a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT A502_Y503dup demonstrated resistance to treatment with Gleevec (imatinib), resulting in increased tumor volume (PMID: 27777285). 27777285
KIT A502_Y503dup gastrointestinal stromal tumor predicted - sensitive Binimetinib + Imatinib Case Reports/Case Series Actionable In a Phase II trial, Gleevec (imatinib) and Mektovi (binimetinib) combination treatment resulted in a 90% pathological response and 27% RECIST response in the primary tumor and 100% pathological response in metastatic lesions of a patient with an esophageal gastrointestinal stromal tumor harboring KIT A502_Y503dup (PMID: 35041493; NCT01991379). 35041493
KIT A502_Y503dup Advanced Solid Tumor sensitive Avapritinib Preclinical - Cell culture Actionable In a preclinical study, Ayvakit (avapritinib) treatment resulted in decreased cell viability and reduced KIT signaling in transformed cells expressing KIT A502_Y503dup in culture, but was less potent compared to treatment with AZD3229 (PMID: 32350132). 32350132
KIT A502_Y503dup gastrointestinal stromal tumor sensitive Cabozantinib Preclinical - Pdx Actionable In a preclinical study, Cometriq (Cabometyx, cabozantinib) resulted in decreased tumor volume and reduced mitotic activity in a gastrointestinal stromal tumor patient derived xenograft (PDX) model harboring KIT A502_Y503dup (PMID: 27777285). 27777285
KIT A502_Y503dup Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability and inhibition of KIT signaling (PMID: 32350132). 32350132
KIT A502_Y503dup gastrointestinal stromal tumor predicted - sensitive Regorafenib Preclinical - Pdx Actionable In a preclinical study, Stivarga (regorafenib) did not significantly inhibit Kit, Erk, or Mtor signaling, but resulted in tumor growth inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT A502_Y503dup and KIT D820E, which was established from a patient who did not respond to Gleevec (imatinib mesylate) and Sutent (sunitinib) (PMID: 29100343). 29100343
KIT A502_Y503dup Advanced Solid Tumor sensitive Flumatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup (Y503_F504insAY) were sensitive to Flumatinib in culture, demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT A502_Y503dup Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup (Y503_F504insAY) were sensitive to Sutent (sunitinib) in culture, demonstrating decreased cell proliferation (PMID: 24205792). 24205792
KIT A502_Y503dup 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 A502_Y503dup in culture, but was less potent compared to treatment with AZD3229 (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D820E gastrointestinal stromal tumor predicted - resistant Sunitinib Preclinical - Pdx Actionable In a preclinical study, Sutent (sunitinib) did not inhibit Kit, Erk, or Mtor signaling and resulted in minimal (26.2%) tumor inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT A502_Y503dup and KIT D820E, which was established from a patient who did not respond to Gleevec (imatinib mesylate) and Sutent (sunitinib) (PMID: 29100343). 29100343
KIT A502_Y503dup KIT D820E gastrointestinal stromal tumor resistant Imatinib Preclinical - Pdx Actionable In a preclinical study, Gleevec (imatinib mesylate) did not inhibit Kit, Erk, or Mtor signaling and resulted in minimal (7.4%) tumor inhibition in patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT A502_Y503dup and KIT D820E, which was established from a patient who did not respond to Gleevec (imatinib mesylate) and Sutent (sunitinib) (PMID: 29100343). 29100343
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 A502_Y503dup KIT V654A Advanced Solid Tumor resistant Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated resistance to Ayvakit (avapritinib) in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT V654A Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated resistance to Gleevec (imatinib) in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT V654A Advanced Solid Tumor decreased response Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated a decreased response to treatment with Qinlock (ripretinib) compared to cells expressing KIT A502_Y503dup alone in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT V654A Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT A502_Y503dup KIT V654A Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated resistance to Stivarga (regorafenib) in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT V654A Advanced Solid Tumor sensitive Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT V654A demonstrated sensitivity to Sutent (sunitinib) in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor sensitive Avapritinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated increased sensitivity to treatment with Ayvakit (avapritinib) compared to cells expressing KIT A502_Y503dup alone in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor resistant Imatinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated resistance to Gleevec (imatinib) in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor decreased response Ripretinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated a decreased response to treatment with Qinlock (ripretinib) compared to cells expressing KIT A502_Y503dup alone in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor sensitive AZD3229 Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated sensitivity to AZD3229 in culture, resulting in reduced cell viability (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor resistant Sunitinib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated resistance to Sutent (sunitinib) in culture (PMID: 32350132). 32350132
KIT A502_Y503dup KIT D816H Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing KIT A502_Y503dup and KIT D816H demonstrated resistance to Stivarga (regorafenib) in culture (PMID: 32350132). 32350132
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT exon9 Advanced Solid Tumor resistant Regorafenib Preclinical Actionable In a preclinical study, Stivarga (regorafineb) had no effect on transformed cells expressing a KIT exon 9 mutation in culture (PMID: 25239608). 25239608
KIT exon9 gastrointestinal stromal tumor sensitive Regorafenib Guideline Actionable Stivarga (regorafenib) is included in guidelines as third-line or subsequent therapy for locally advanced, unresectable, or metastatic gastrointestinal stromal tumor (GIST) patients harboring sensitizing mutations, such as KIT exon 9 mutations (PMID: 34560242; ESMO.org). 34560242 detail...
KIT exon9 Advanced Solid Tumor sensitive Sunitinib Preclinical Actionable In a preclinical study, transformed cells expressing a KIT exon 9 mutation demonstrated sensitivity to treatment with Sutent (sunitinib) in culture, resulting in reduced cell viability (PMID: 25239608). 25239608
KIT exon9 gastrointestinal stromal tumor sensitive Sunitinib Guideline Actionable Sutent (sunitinib) is included in guidelines as second-line or subsequent therapy for locally advanced, unresectable, or metastatic gastrointestinal stromal tumor (GIST) patients harboring sensitizing mutations, such as KIT exon 9 mutations (PMID: 34560242; ESMO.org). detail... 34560242
KIT exon9 gastrointestinal stromal tumor sensitive Sunitinib Clinical Study - Cohort Actionable In a retrospective analysis, GIST patients with KIT exon 9 mutations showed improved progression-free survival (PFS), overall survival, and objective response rate (ORR) compared to patients with exon 11 mutations, with a median PFS of 12.3 months vs. 7.0 months, and an ORR of 19% (8/42) vs. 6% (9/143) following treatment with Sutent (sunitinib) (PMID: 26772734). 26772734
KIT exon9 gastrointestinal stromal tumor predicted - sensitive Ripretinib Guideline Actionable Qinlock (ripretinib) is included in guidelines as fourth-line or subsequent therapy for locally advanced, unresectable, or metastatic gastrointestinal stromal tumor (GIST) patients harboring sensitizing mutations, such as KIT exon 9 mutations (PMID: 34560242; ESMO.org). 34560242 detail...
KIT exon9 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 (n=135) or PDGFRA mutations (n=7), with a median progression-free survival of 5.6 months, 18.3% (26/142) of the patients harbored KIT exon 9 mutations (PMID: 32804590; NCT02571036). 32804590
KIT exon9 Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, transformed cells expressing a KIT exon 9 mutation demonstrated sensitivity to treatment with Iclusig (ponatinib) in culture, resulting in reduced cell viability (PMID: 25239608). 25239608
KIT exon9 gastrointestinal stromal tumor no benefit Imatinib + Infigratinib Phase I Actionable In a Phase I trial, Truseltiq (infigratinib) and Gleevec (imatinib) combination therapy resulted in stable disease as best response in 58% (7/12) of patients with advanced gastrointestinal stromal tumor harboring KIT mutations in exon 9 (n=3), exon 11 (n=10), or other (n=3), however, the trial was discontinued due to toxicity concerns (PMID: 30101387). 30101387
KIT exon9 Advanced Solid Tumor resistant Imatinib Preclinical Actionable In a preclinical study, Gleevec (imatinib) had no effect on transformed cells expressing a KIT exon 9 mutation in culture (PMID: 25239608). 25239608
KIT exon9 gastrointestinal stromal tumor sensitive Imatinib Guideline Actionable Gleevec (imatinib) is included in guidelines for patients with gastrointestinal stromal tumor (GIST) harboring KIT exon 9 mutations (NCCN.org). detail...
KIT exon9 gastrointestinal stromal tumor sensitive Imatinib Guideline Actionable Gleevec (imatinib) is included in guidelines for gastrointestinal stromal tumor (GIST) patients harboring sensitizing mutations, such as KIT exon 9 mutations, as adjuvant therapy for patients with localized disease and as first-line therapy for patients with locally advanced, unresectable, or metastatic disease (PMID: 34560242; ESMO.org). 34560242 detail...
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 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 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 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 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 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 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 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 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...