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Diagnostic features in paediatric MDS-EB with UBTF-internal tandem duplication: defining a unique subgroup.

Authors :
Schwarz-Furlan S
Gengler C
Yoshimi-Noellke A
Piontek G
Schneider-Kimoto Y
Schmugge M
Thiede C
Niemeyer CM
Erlacher M
Rudelius M
Source :
Histopathology [Histopathology] 2024 Nov 20. Date of Electronic Publication: 2024 Nov 20.
Publication Year :
2024
Publisher :
Ahead of Print

Abstract

Aim: Tandem-duplications of the UBTF gene (UBTF-TDs) have recently been identified as a new genetic driver in young individuals with acute myeloid leukaemia (AML) and myelodysplastic syndrome (MDS). Disease in these newly defined subgroups is characterized by poor response to standard intensive chemotherapy and inferior survival of the affected patients. However, a thorough analysis of bone marrow histomorphology of UBTF-mutated neoplasia has not been undertaken thus far.<br />Methods and Results: In this retrospective study, we investigated the characteristic histopathological features of a cohort comprising 14 paediatric MDS patients with an excess of blasts (MDS-EB) and UBTF-TD. Bone marrow biopsies from these patients revealed hypercellularity and severe dysplasia across all three haematopoietic lineages. In particular, a marked hyperplastic megakaryopoiesis characterized by the presence of frequent micromegakaryocytes and a high number of monolobulated cells forming small clusters was observed. Additionally, erythropoiesis was left-shifted, with numerous blastoid precursors. The granulopoietic precursors displayed prominent UBTF-positive nucleoli.<br />Conclusion: The unique combination of these histomorphological features strongly suggests a possible UBTF aberration. It will allow initiating the appropriate genetic testing to confirm the presence of UBTF-TD and identify potential additional genetic alterations. Such molecular profiling will not only contribute to a better understanding of the disease mechanism, but also facilitate more rational treatment approaches for these high-risk paediatric MDS patients.<br /> (© 2024 The Author(s). Histopathology published by John Wiley & Sons Ltd.)

Details

Language :
English
ISSN :
1365-2559
Database :
MEDLINE
Journal :
Histopathology
Publication Type :
Academic Journal
Accession number :
39564724
Full Text :
https://doi.org/10.1111/his.15378