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Updated: Apr 27, 2026
07:49
Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
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Activating FGFR2-RAS-BRAF mutations in ameloblastoma.
Noah A Brown1, Delphine Rolland1, Jonathan B McHugh1
1Departments of Pathology and.
Summary
Activating mutations in FGFR2, RAS, and BRAF are found in 88% of ameloblastomas, with BRAF V600E being common. These mutations impact diagnosis and prognosis, suggesting targeted therapy potential.
Area of Science:
- Oral pathology
- Molecular oncology
- Genetics
Background:
- Ameloblastoma is a common odontogenic neoplasm with an incompletely understood genetic basis.
- Characterizing the mutational landscape is crucial for understanding ameloblastoma pathogenesis and identifying therapeutic targets.
Purpose of the Study:
- To comprehensively characterize pathogenic mutations in ameloblastoma.
- To investigate the clinical and functional significance of these mutations, focusing on the mitogen-activated protein kinase (MAPK) pathway.
Main Methods:
- Analysis of 84 ameloblastomas and 40 other odontogenic tumors using BRAF V600E specific PCR, VE1 IHC, and next-generation sequencing (Ion AmpliSeq Cancer Hotspot Panel).
- Evaluation of BRAF inhibitor efficacy in an ameloblastoma cell line.
Main Results:
- Activating, mutually exclusive RAS-BRAF and FGFR2 mutations identified in 88% of ameloblastomas.
- BRAF V600E mutation found in 62% of cases, associated with younger onset and specific tumor locations.
- Constitutive MAPK pathway activation observed in ameloblastoma cells, potently inhibited by vemurafenib.
Conclusions:
- Activating FGFR2-RAS-BRAF mutations are key drivers in ameloblastoma pathogenesis.
- BRAF V600E mutations offer diagnostic and prognostic value.
- In vitro sensitivity to BRAF inhibitors suggests a potential for targeted therapy in ameloblastoma treatment.
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