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Gene FGFR3
Variant L645V
Impact List missense
Protein Effect unknown
Gene Variant Descriptions FGFR3 L645V lies within the protein kinase domain of the Fgfr3 protein (UniProt.org). L645V has been identified in sequencing studies (PMID: 25148578), but has not been biochemically characterized and therefore, its effect on Fgfr3 protein function is unknown (PubMed, Mar 2024).
Associated Drug Resistance
Category Variants Paths

FGFR3 mutant FGFR3 L645V

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Transcript NM_000142.5
gDNA chr4:g.1806147C>G
cDNA c.1933C>G
Protein p.L645V
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000142.5 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
NM_000142 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
XM_006713873.2 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
XM_047449824.1 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
NM_000142.4 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
XM_047449823.1 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
XM_006713873 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38
XM_006713873.1 chr4:g.1806147C>G c.1933C>G p.L645V RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
FGFR3 mutant bladder urothelial carcinoma sensitive Dovitinib Phase II Actionable In a Phase II trial, Dovitinib (TKI258) treatment resulted in complete response in 33% (1/3) of patients with BCG-unresponsive, non-muscle-invasive, urothelial carcinoma of the bladder harboring FGFR3 mutations (PMID: 27932416). 27932416
FGFR3 mutant transitional cell carcinoma sensitive Infigratinib Clinical Study Actionable In a clinical study, Truseltiq (infigratinib) treatment in patients with FGFR3 alterations led to 25.4% (17/67) confirmed responses and a disease control rate of 64% (43/67), which included complete responses, partial responses, and stable disease, and resulted in a median progression-free survival of 3.75 months and a median overall survival of 7.75 months (PMID: 29848605). 29848605
FGFR3 mutant transitional cell carcinoma sensitive Infigratinib Phase I Actionable In a Phase I trial, Truseltiq (infigratinib) treatment resulted in complete response in 4% (1/25) and partial response in 32% (8/25) of urothelial carcinoma patients harboring FGFR3 mutations or fusions (J Clin Oncol 34, 2016 (suppl; abstr 4517); NCT01004224). detail...
FGFR3 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...
FGFR3 mutant transitional cell carcinoma no benefit Atezolizumab Phase II Actionable In a Phase II trial (IMVigor 210, CheckMate 275), Tecentriq (atezolizumab) (n=119) treatment resulted in similar response rate (24% vs 21%, p=0.8) in patients with FGFR3 mutant or wild-type metastatic transitional cell carcinoma (PMID: 31272788). 31272788
FGFR3 mutant cholangiocarcinoma predicted - sensitive Erdafitinib Phase I Actionable In a Phase I trial, Balversa (erdafitinib) treatment resulted in an objective response rate of 27% (3/11) in patients with cholangiocarcinoma harboring FGFR genomic alterations, including 1 with FGFR2 mutation, 2 with FGFR3 mutations, and 8 with FGFR2 fusions (PMID: 31088831; NCT01703481). 31088831
FGFR3 mutant urinary bladder cancer sensitive Fexagratinib Preclinical - Cell culture Actionable In a preclinical study, AZD4547 inhibited survival of bladder cancer cells harboring FGFR3 mutation in culture (PMID: 27550940). 27550940
FGFR3 mutant Advanced Solid Tumor predicted - sensitive Erdafitinib Case Reports/Case Series Actionable In a Phase II trial (MATCH), Balversa (erdafitinib) treatment resulted in an objective response rate of 16% (4/25), median progression-free survival of 3.6 months, and median overall survival of 11.0 months in patients with advanced solid tumors harboring FGFR1, FGFR2, or FGFR3 mutations or fusions (PMID: 38603650; NCT02465060). 38603650
FGFR3 mutant Advanced Solid Tumor sensitive Infigratinib Preclinical Actionable In a preclinical study, tumor cell lines with FGFR3 mutations demonstrated sensitivity to Truseltiq (infigratinib) in culture (PMID: 23002168). 23002168
FGFR3 mutant Advanced Solid Tumor predicted - sensitive Zoligratinib 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
FGFR3 mutant bladder urothelial carcinoma sensitive Infigratinib Phase I Actionable In a Phase I trial, patients with bladder urothelial carcinoma harboring an FGFR3 mutation demonstrated a disease control rate of 75% (6/8) when treated with Truseltiq (infigratinib), including 3 patients with a partial response and 3 with stable disease (PMID: 27870574; NCT01004224). 27870574
FGFR3 mutant transitional cell carcinoma no benefit Nivolumab Phase II Actionable In a Phase II trial (CheckMate 275), Opdivo (nivolumab) (n=270) treatment resulted in similar response rate (20% vs 21%, p=0.2) in patients with FGFR3 mutant or wild-type metastatic transitional cell carcinoma (PMID: 31272788). 31272788
FGFR3 mutant transitional cell carcinoma predicted - sensitive Cetrelimab + Erdafitinib Phase II Actionable In a Phase II trial, the combination of Balversa (erdafitinib) and Cetrelimab (JNJ-63723283) treatment resulted in an overall response rate of 54.5% (6 complete responses), disease control rate of 79.5%, median duration of response of 11.10 months, median progression-free survival of 10.97 months, and a 12-month overall survival of 68% in patients with metastatic urothelial carcinoma harboring FGFR mutations (J Clin Oncol 41, 2023 (suppl 16; abstr 4504); NCT03473743). detail...
FGFR3 mutant transitional cell carcinoma sensitive Erdafitinib Phase I Actionable In a Phase I trial, Balversa (erdafitinib) treatment resulted in an objective response rate of 46% (12/26) in patients with urothelial carcinoma harboring FGFR genomic alterations, including 17 with FGFR3 mutations, and 11 with FGFR2 and/or FGFR3 fusions (PMID: 31088831; NCT01703481). 31088831
FGFR3 mutant transitional cell carcinoma sensitive Erdafitinib Guideline Actionable Balversa (erdafitinib) is included in the guidelines for patients with advanced or metastatic urothelial carcinoma harboring Fgfr3 alterations after progression on platinum-based regimens (NCCN.org). detail...
FGFR3 mutant transitional cell carcinoma sensitive Erdafitinib Case Reports/Case Series Actionable In a Phase I trial, Balversa (erdafitinib) treatment resulted in 25% tumor shrinkage at week 8 in an urothelial cancer patient harboring FGFR3 mutations (PMID: 26324363; NCT01703481). 26324363
FGFR3 mutant transitional cell carcinoma sensitive Erdafitinib FDA approved - Has Companion Diagnostic Actionable In a Phase II trial (BCL2001) that supported FDA approval, Balversa (erdafitinib) treatment resulted in an objective response rate of 40% (40/99, 3 complete response, 37 partial response) and a disease control rate of 80% in patients with metastatic or unresectable urothelial carcinoma harboring FGFR alterations (PMID: 31340094; NCT02365597). detail... 31340094 detail...
FGFR3 mutant transitional cell carcinoma predicted - sensitive Docetaxel + Vofatamab Phase Ib/II Actionable In a Phase I/II trial, Vofatamab (B-701) in combination with Taxotere (docetaxel) demonstrated safety and preliminary efficacy, resulted in enhanced activity in patients with locally advanced or metastatic urothelial carcinoma harboring FGFR3 mutations or fusions comparing to wild-type patients (Journal of Clinical Oncology 36, no. 15_suppl (May 20 2018) 4534-4534; NCT02401542). detail...
FGFR3 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...
FGFR3 mutant bladder urothelial carcinoma sensitive Erdafitinib FDA approved - Has Companion Diagnostic Actionable In a Phase II trial (BCL2001) that supported FDA approval, Balversa (erdafitinib) treatment resulted in an objective response rate of 40% (40/99, 3 complete response, 37 partial response) and a disease control rate of 80% in patients with metastatic or unresectable urothelial carcinoma harboring FGFR alterations (PMID: 31340094; NCT02365597). detail... 31340094 detail...