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. 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. 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.