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Published in: Virchows Archiv 4/2015

01-10-2015 | Case Report

Langerhans cell sarcoma following marginal zone lymphoma: expanding the knowledge on mature B cell plasticity

Authors: Maria Raffaella Ambrosio, Giulia De Falco, Bruno Jim Rocca, Aurora Barone, Teresa Amato, Cristiana Bellan, Stefano Lazzi, Lorenzo Leoncini

Published in: Virchows Archiv | Issue 4/2015

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Abstract

The concept of unidirectional differentiation of the haematopoietic stem cell has been challenged after recent findings that human B cell progenitors and even mature B cells can be reprogrammed into histiocytic/dendritic cells by altering expression of lineage-associated transcription factors. The conversion of mature B cell lymphomas to Langerhans cell neoplasms is not well documented. Three previous reports have described clonally related follicular lymphoma and Langerhans cell tumours, whereas no case has been published of clonally related marginal zone lymphoma and Langerhans cell sarcoma. We describe the case of a 77-year-old patient who developed a Langerhans cell sarcoma and 6 years later a nodal marginal zone lymphoma. Mutation status examination showed 100 % gene identity to the germline sequence, suggesting direct trans-differentiation or dedifferentiation of the nodal marginal zone lymphoma to the Langerhans cell sarcoma rather than a common progenitor. We found inactivation of paired box 5 (PAX-5) in the lymphoma cells by methylation, along with duplication of part of the long arm of chromosomes 16 and 17 in the sarcoma cells. The absence of PAX-5 could have triggered B cells to differentiate into macrophages and dendritic cells. On the other hand, chromosomal imbalances might have activated genes involved in myeloid lineage maturation, transcription activation and oncogenesis. We hypothesize that this occurred because of previous therapies for nodal marginal zone lymphoma. Better understanding of this phenomenon may help in unravelling the molecular interplay between transcription factors during haematopoietic lineage commitment and may expand the spectrum of clonally related mature B cell neoplasms and Langerhans cell tumours.
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Metadata
Title
Langerhans cell sarcoma following marginal zone lymphoma: expanding the knowledge on mature B cell plasticity
Authors
Maria Raffaella Ambrosio
Giulia De Falco
Bruno Jim Rocca
Aurora Barone
Teresa Amato
Cristiana Bellan
Stefano Lazzi
Lorenzo Leoncini
Publication date
01-10-2015
Publisher
Springer Berlin Heidelberg
Published in
Virchows Archiv / Issue 4/2015
Print ISSN: 0945-6317
Electronic ISSN: 1432-2307
DOI
https://doi.org/10.1007/s00428-015-1814-8

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