Abstract
Background
The detection of KMT2A gene rearrangements have an important impact on the prognosis and management of acute leukemias. These alterations most commonly involve reciprocal translocations at specific breakpoint regions within KMT2A. To date, more than 100 translocation partner genes of KMT2A have been identified, with different effects on risk stratification.
Methods and results
We report the case of a mature plasmacytoid dendritic cells proliferation associated with B lymphoblasts harboring a KMT2A-ARHGEF12 fusion. This rare rearrangement, resulting from a cryptic deletion on the long arm of chromosome 11, is located outside the known major and minor breakpoint regions of KMT2A, not reported to date. The review of the few cases of KMT2A-ARHGEF12 reveals the tendency of this deletion to occur in therapy related hematologic neoplasm and confer unfavorable prognosis.
Conclusion
This review sheds light into the rare KMT2A-ARHGEF12 fusion in leukemia. Reporting rare chimeras is essential to improve knowledge about the biological mechanism and associated clinical consequences
Data Availability
Data presented in this study can be found in the Laboratory Information System of the centre hospitalier de Versailles and the Institute of Pharmaceutical Biology/DCAL, Goethe-University Frankfurt.
Code availability
Not applicable.
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Acknowledgements
The authors would like to thank the Centre Hospitalier de Versailles for editorial assistance.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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N.A wrote the manuscript; R.L helped writing the manuscript; F.M, V. R, J.O, M.S, R.K, F. R, F.G, V.E, I.L, L.C.A, M.D-A, P.L, C.M, R.M, P.R reviewed the manuscript and participate in the diagnosis/clinical management and C.T had the manuscript idea and reviewed the manuscript.
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Patient’s informed consent was obtained for anonymous publication of his case. This study has been approved by the ethical committee “Comite ethique recherche clinique” at the centre hospitalier de Versailles, number 21–02.
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Assaf, N., Liévin, R., Merabet, F. et al. KMT2A-ARHGEF12, a therapy related fusion with poor prognosis. Mol Biol Rep 48, 7021–7027 (2021). https://doi.org/10.1007/s11033-021-06621-5
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DOI: https://doi.org/10.1007/s11033-021-06621-5