Myeloid malignancies with acquired trisomy 21 as the sole cytogenetic change are clinically highly variable and display a heterogeneous pattern of copy number alterations and mutations(a).
Objectives: Acquired trisomy 21 is one of the most common numerical abnormalities in acute myeloid leukemia (AML), myelodysplastic syndrome (MDS), myeloproliferative neoplasms (MPN), and MDS/MPN; however, little is known about its pathogenic impact, accompanying submicroscopic changes, and its relation to other clinical features. Furthermore, previous studies addressing this issue have mainly focu