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Rapid Development of Unclassified Myeloid Lineage Acute Leukaemia With Trisomy 6 and U2AF1 Mutation
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Rapid Development of Unclassified Myeloid Lineage Acute Leukaemia With Trisomy 6 and U2AF1 Mutation
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Journal Article
Rapid Development of Unclassified Myeloid Lineage Acute Leukaemia With Trisomy 6 and U2AF1 Mutation
2025
Overview
We present a case of acute clonal bone marrow 98% infiltration of atypical myeloid cells with borderline hypogranular/agranular promyelocytes/myelocytes and occasional blast cells maturity, which also formed extramedullary tumours in the chest wall, with isolated trisomy of chromosome 6 and pathogenic variant U2AF1 (S34F) that escapes established acute myeloid leukaemia (AML) diagnostic criteria according to the World Health Organization (WHO) classification. Following standard daunorubicin and cytarabine induction therapy, the disease progressed with the appearance of a previously undetected clone of leukaemic cells with a distinct immunophenotype demonstrating monocytoid differentiation and clonal evolution to a hypo‐tetraploid karyotype with an average number of 84 chromosomes and new pathogenic NRAS and ZRSR2 mutations. The patient reactivated refractory disseminated intravascular coagulation (DIC) leading to a progressive supratentorial hematoma and finally cardiac arrest. In conclusion, our report shows that atypical clonal myelocytes can massively infiltrate the bone marrow and form extramedullary tumours, justifying the diagnosis and treatment of acute leukaemia, although they did not fit the current classification.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
Subject
/ AML‐molecular diagnosis & therapy
/ Anemia
/ Chromosomes, Human, Pair 6 - genetics
/ Disseminated intravascular coagulation
/ Genes
/ Hematoma
/ Humans
/ Leukemia
/ Leukemia, Myeloid, Acute - diagnosis
/ Leukemia, Myeloid, Acute - drug therapy
/ Leukemia, Myeloid, Acute - genetics
/ Leukemia, Myeloid, Acute - pathology
/ Male
/ Mutation
/ Original
/ Splicing Factor U2AF - genetics
/ Trisomy
/ Tumors
