A1 Refereed original research article in a scientific journal
The Mutational Profile of Unicystic Ameloblastoma
Authors: Heikinheimo K, Huhtala JM, Thiel A, Kurppa KJ, Heikinheimo H, Kovac M, Kragelund C, Warfvinge G, Dawson H, Elenius K, Ristimäki A, Baumhoer D, Morgan PR
Publication year: 2019
Journal: Journal of Dental Research
Journal name in source: Journal of dental research
Journal acronym: J Dent Res
Volume: 98
Issue: 1
First page : 54
Last page: 60
Number of pages: 7
ISSN: 0022-0345
eISSN: 1544-0591
DOI: https://doi.org/10.1177/0022034518798810
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/37064633
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.
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