IG-MYC+ neoplasms with precursor B-cell phenotype are molecularly distinct from Burkitt lymphomas
The WHO Classification of Tumours of Haematopoietic and Lymphoid Tissue notes instances of Burkitt lymphoma/leukemia (BL) with IG-MYC rearrangement displaying a B-cell precursor immunophenotype (termed herein "preBLL"). To characterize the molecular pathogenesis of preBLL, we investigated...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2018
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| In: |
Blood
Year: 2018, Volume: 132, Issue: 21, Pages: 2280-2285 |
| ISSN: | 1528-0020 |
| DOI: | 10.1182/blood-2018-03-842088 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1182/blood-2018-03-842088
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| Author Notes: | Rabea Wagener, Cristina López, Kortine Kleinheinz, Julia Bausinger, Sietse M. Aukema, Inga Nagel, Umut H. Toprak, Julian Seufert, Janine Altmüller, Holger Thiele, Christof Schneider, Julia Kolarova, Jeongbin Park, Daniel Hübschmann, Eva M. Murga Penas, Hans G. Drexler, Andishe Attarbaschi, Randi Hovland, Eigil Kjeldsen, Michael Kneba, Udo Kontny, Laurence de Leval, Peter Nürnberg, Ilske Oschlies, David Oscier, Brigitte Schlegelberger, Stephan Stilgenbauer, Wilhelm Wössmann, Matthias Schlesner, Birgit Burkhardt, Wolfram Klapper, Elaine S. Jaffe, Ralf Küppers, and Reiner Siebert |
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| 520 | |a The WHO Classification of Tumours of Haematopoietic and Lymphoid Tissue notes instances of Burkitt lymphoma/leukemia (BL) with IG-MYC rearrangement displaying a B-cell precursor immunophenotype (termed herein "preBLL"). To characterize the molecular pathogenesis of preBLL, we investigated 13 preBLL cases (including 1 cell line), of which 12 were analyzable using genome, exome, and targeted sequencing, imbalance mapping, and DNA methylation profiling. In 5 patients with reads across the IG-MYC breakpoint junctions, we found evidence that the translocation derived from an aberrant VDJ recombination, as is typical for IG translocations arising in B-cell precursors. Genomic changes like biallelic IGH translocations or VDJ rearrangements combined with translocation into the VDJ region on the second allele, potentially preventing expression of a productive immunoglobulin, were detected in 6 of 13 cases. We did not detect mutations in genes frequently altered in BL, but instead found activating NRAS and/or KRAS mutations in 7 of 12 preBLLs. Gains on 1q, recurrent in BL and preB lymphoblastic leukemia/lymphoma (pB-ALL/LBL), were detected in 7 of 12 preBLLs. DNA methylation profiling showed preBLL to cluster with precursor B cells and pB-ALL/LBL, but apart from BL. We conclude that preBLL genetically and epigenetically resembles pB-ALL/LBL rather than BL. Therefore, we propose that preBLL be considered as a pB-ALL/LBL with recurrent genetic abnormalities. | ||
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