Gene Variant Detail

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Gene FGFR1
Variant K656E
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions FGFR1 K656E lies within the cytoplasmic domain of the Fgfr1 protein (UniProt.org). K656E does not confer a growth advantage in a competition assay but confers a gain of function to the Fgfr1 protein as demonstrated by constitutive activation of MAPK signaling (PMID: 23817572), and is transforming in cultured cells (PMID: 23817572, PMID: 34272467).
Associated Drug Resistance

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Transcript NM_023110.2
gDNA chr8:g.38414790T>C
cDNA c.1966A>G
Protein p.K656E
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_023110 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_011544450.2 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_006716303.3 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_011544449.1 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_017013221.1 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_011544449 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_006716304 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_011544450 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_017013226 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_006716304.1 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_006716303 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_017013221 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
NM_023110.2 chr8:g.38414790T>C c.1966A>G p.K656E RefSeq GRCh38/hg38
XM_017013226.1 chr8:g.38414198T>C c.1966A>G p.K656E RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
FGFR1 K656E Advanced Solid Tumor predicted - sensitive Infigratinib Preclinical - Cell culture Actionable In a preclinical study, cells expressing FGFR1 K656E were sensitive to treatment with Truseltiq (infigratinib) in culture, demonstrating reduced cell viability (PMID: 34272467). 34272467
FGFR1 K656E Advanced Solid Tumor predicted - resistant Dovitinib Preclinical - Cell culture Actionable In a preclinical study, cells expressing FGFR1 K656E were resistant to treatment with Dovitinib (TKI258) in culture (PMID: 34272467). 34272467
FGFR1 K656E Advanced Solid Tumor predicted - sensitive Pemigatinib Preclinical - Cell culture Actionable In a preclinical study, cells expressing FGFR1 K656E were sensitive to treatment with Pemazyre (pemigatinib) in culture, demonstrating reduced cell viability (PMID: 34272467). 34272467
FGFR1 K656E Advanced Solid Tumor predicted - sensitive Erdafitinib Preclinical - Cell culture Actionable In a preclinical study, cells expressing FGFR1 K656E were sensitive to treatment with Balversa (erdafitinib) in culture, demonstrating reduced cell viability (PMID: 34272467). 34272467
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
FGFR1 act mut Advanced Solid Tumor decreased response Nintedanib Preclinical Actionable In a preclinical study, transformed cells expressing constitutively active FGFR1 demonstrated reduced sensitivity to Ofev (Nintedanib) in culture, when compared to other tyrosine kinase inhibitors (PMID: 22238366). 22238366
FGFR1 act mut Advanced Solid Tumor sensitive Ponatinib Preclinical Actionable In a preclinical study, Iclusig (ponatinib) inhibited receptor phosphorylation and cell growth in transformed cells expressing constitutively active FGFR1 in culture (PMID: 22238366). 22238366
FGFR1 act mut Advanced Solid Tumor sensitive Dovitinib Preclinical Actionable In a preclinical study, Dovitinib (TKI258) inhibited receptor phosphorylation and cell proliferation in transformed cells expressing constitutively active FGFR1 in culture (PMID: 22238366). 22238366
FGFR1 act mut Advanced Solid Tumor no benefit Brivanib Preclinical Actionable In a preclinical study, Brivanib (BMS-540215) did not inhibit receptor phosphorylation and cell proliferation in transformed cells expressing constitutively active FGFR1 in culture (PMID: 22238366). 22238366
FGFR1 act mut Advanced Solid Tumor decreased response Cediranib Preclinical Actionable In a preclinical study, transformed cells expressing constitutively active FGFR1 demonstrated reduced sensitivity to inhibition of receptor phosphorylation and cell proliferation by Cediranib (AZD-2171) in culture, when compared to other tyrosine kinase inhibitors (PMID: 22238366). 22238366
FGFR1 act mut breast cancer sensitive FIIN-1 Preclinical Actionable In a preclinical study, FIIN-01 inhibited Fgfr1 activation-induced proliferation and transformation of human breast epithelial cell lines in culture (PMID: 20338520). 20338520
FGFR1 act mut Advanced Solid Tumor sensitive Debio 1347 Phase I Actionable In a Phase I trial, Debio 1347 (CH5183284) dosing regimen has been determined in solid tumor patients with activating FGFR1 alterations (JCO, Vol 33, No 15_suppl (May 20 Supplement), 2015: 2540). detail...
FGFR1 act mut Advanced Solid Tumor predicted - sensitive Erdafitinib Phase I Actionable In a Phase I trial, Balversa (erdafitinib) treatment resulted in stable disease in 70% (16/23) and partial response in 22% (5/23) of patients with advanced solid tumors harboring FGFR 1-4 activating mutations (including amplifications, mutations and translocations), while no antitumor activity was observed in patients with unknown or no known changes in FGFR (PMID: 26324363; NCT01703481). 26324363
FGFR1 mutant Advanced Solid Tumor predicted - sensitive Debio 1347 Phase I Actionable In a Phase I trial, Debio 1347 treatment resulted in partial response in 10.5% (6/57) and stable disease in 28.1% (16/57) of patients with advanced solid tumors harboring genomic alterations of FGFR1/2/3, including amplifications, fusions, and mutations (PMID: 30745300; NCT01948297). 30745300
FGFR1 mutant transitional cell carcinoma predicted - sensitive Erdafitinib Phase II Actionable In a Phase II trial, Balversa (erdafitinib) treatment resulted in an objective response rate of 42% (40/96, 3 complete response, 37 partial response) and a disease control rate of 80% in patients with metastatic or unresectable urothelial carcinoma harboring FGFR alterations (J Clin Oncol 36, 2018 (suppl; abstr 4503); NCT02365597). detail...
FGFR1 mutant Advanced Solid Tumor predicted - sensitive ICP-192 Phase I Actionable In a Phase I trial, ICP-192 (gunagratinib) was well-tolerated, and resulted in an overall response rate or 33.3% (4/12, 1 complete response, 3 partial response) and a disease control rate of 91.7% (11/12) in patients with advanced solid tumors harboring FGF/FGFR gene aberrations (J Clin Oncol 39, 2021 (suppl 15; abstr 4092); NCT03758664). detail...
FGFR1 mutant Advanced Solid Tumor sensitive Pemigatinib Preclinical - Cell line xenograft Actionable In a preclinical study, a variety of cancer cell lines harboring mutations in FGFR1, FGFR2, and/or FGFR3 demonstrated sensitivity to Pemazyre (pemigatinib) in culture and in cell line xenograft models, resulting in inhibition of tumor growth (Cancer Res 2015;75(15 Suppl):Abstract nr 771). detail...
Molecular Profile Protein Effect Treatment Approaches
FGFR1 K656E gain of function FGFR Inhibitor (Pan) FGFR1 Inhibitor