Abstract | PURPOSE: EXPERIMENTAL DESIGN: RESULTS: Somatic, activating, and mutually exclusive RAS-BRAF and FGFR2 mutations were identified in 88% of cases. Somatic mutations in SMO, CTNNB1, PIK3CA, and SMARCB1 were also identified. BRAF V600E was the most common mutation, found in 62% of ameloblastomas and in ameloblastic fibromas/fibrodentinomas but not in other odontogenic tumors. This mutation was associated with a younger age of onset, whereas BRAF wild-type cases arose more frequently in the maxilla and showed earlier recurrences. One hundred percent concordance was observed between VE1 immunohistochemistry and molecular detection of BRAF V600E mutations. Ameloblastoma cells demonstrated constitutive MAPK pathway activation in vitro. Proliferation and MAPK activation were potently inhibited by the BRAF inhibitor vemurafenib. CONCLUSIONS: Our findings suggest that activating FGFR2-RAS-BRAF mutations play a critical role in the pathogenesis of most cases of ameloblastoma. Somatic mutations in SMO, CTNNB1, PIK3CA, and SMARCB1 may function as secondary mutations. BRAF V600E mutations have both diagnostic and prognostic implications. In vitro response of ameloblastoma to a BRAF inhibitor suggests a potential role for targeted therapy.
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Authors | Noah A Brown, Delphine Rolland, Jonathan B McHugh, Helmut C Weigelin, Lili Zhao, Megan S Lim, Kojo S J Elenitoba-Johnson, Bryan L Betz |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 20
Issue 21
Pg. 5517-26
(Nov 01 2014)
ISSN: 1557-3265 [Electronic] United States |
PMID | 24993163
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | ©2014 American Association for Cancer Research. |
Chemical References |
- Biomarkers, Tumor
- FGFR2 protein, human
- Receptor, Fibroblast Growth Factor, Type 2
- BRAF protein, human
- Proto-Oncogene Proteins B-raf
- Mitogen-Activated Protein Kinases
- ras Proteins
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Topics |
- Adolescent
- Adult
- Aged
- Aged, 80 and over
- Alleles
- Ameloblastoma
(genetics)
- Biomarkers, Tumor
(genetics)
- Cell Line, Tumor
- Child
- Female
- Humans
- Jaw Neoplasms
(genetics)
- Middle Aged
- Mitogen-Activated Protein Kinases
(genetics)
- Mutation
(genetics)
- Proto-Oncogene Proteins B-raf
(genetics)
- Receptor, Fibroblast Growth Factor, Type 2
(genetics)
- Signal Transduction
(genetics)
- Young Adult
- ras Proteins
(genetics)
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