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The Mutational Profile of Unicystic Ameloblastoma
Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku and Turku University Hospital, Finland.
Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku and Turku University Hospital, Finland.
Genome-Scale Biology, Research Programs Unit, University of Helsinki, Helsinki, Finland.
Department of Medical Biochemistry and Genetics and MediCity Research Laboratories, University of Turku, Turku, Finland.
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2019 (English)In: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 98, no 1, p. 54-60Article in journal (Refereed) Published
Abstract [en]

BRAF V600E is the most common mutation in conventional ameloblastoma (AM) of the mandible. In contrast, maxillary AMs appear to harbor more frequently RAS, FGFR2, or SMO mutations. Unicystic ameloblastoma (UAM) is considered a less aggressive variant of ameloblastoma, amenable to more conservative treatment, and classified as a distinct entity. The aim of this study was to characterize the mutation profile of UAM ( n = 39) and to compare it to conventional AM ( n = 39). The associations between mutation status and recurrence probability were also analyzed. In the mandible, 94% of UAMs (29/31, including 8/8 luminal, 6/8 intraluminal, and 15/15 mural subtypes) and 74% of AMs (28/38) revealed BRAF V600E mutations. Among the BRAF wild-type cases, 1 UAM showed a missense SMO mutation (p.L412F), whereas 2 NRAS (p.Q61R), 2 HRAS (p.Q61R), and 2 FGFR2 (p.C383R) activating mutations were identified in AM. Of the 3 maxillary UAMs, only 1 revealed a BRAF V600E mutation. Taken together, our findings demonstrate high frequency of activating BRAF V600E mutations in both UAM and AM of the mandible. In maxillary UAMs, the BRAF V600E mutation prevalence appears to be lower as was shown for AM previously. It could therefore be argued that UAM and AM are part of the spectrum of the same disease. AMs without BRAF V600E mutations were associated with an increased rate of local recurrence ( P = 0.0003), which might indicate that routine mutation testing also has an impact on prognosis.

Place, publisher, year, edition, pages
Sage Publications, 2019. Vol. 98, no 1, p. 54-60
Keywords [en]
drug therapy, genetic markers, odontogenic tumors, mitogen-activated protein kinase kinases, jaw neoplasms, survival analysis
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Dentistry
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URN: urn:nbn:se:mau:diva-6876DOI: 10.1177/0022034518798810ISI: 000454149700008PubMedID: 30216733Scopus ID: 2-s2.0-85058887464Local ID: 26673OAI: oai:DiVA.org:mau-6876DiVA, id: diva2:1403827
Available from: 2020-02-28 Created: 2020-02-28 Last updated: 2025-06-04Bibliographically approved

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Warfvinge, Gunnar

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