Near-tetraploidy/tetraploidy acute myeloid leukemia with clinical, pathologic and molecular characteristics.

Near-tetraploidy/tetraploidy (NT/T) is a cytogenetic alteration in acute myeloid leukemia (AML). In AML, specific chromosomal alterations are associated with clinical, morphological, and immunophenotypic features. The impact of cytogenetics on the prognosis of AML is well established. However, the prognostic implication of NT/T on AML remains unclear. Our aim is to further characterize the clinical, morphologic, immunophenotypic, molecular mutational, and prognostic features of NT/T AML. This retrospective chart review of NT/T AML cases showed NT/T AML was more common in older adult males, with predominately large blasts and myelodysplasia-related features. The most common lineage of dysplasia was dysgranulopoiesis in 77.8% of cases. Cases displayed multiple cytogenetic abnormalities, with only four showing NT/T as the sole abnormality. TP53 was the most common molecular mutation associated with NT/T AML (44.5%). Of the patients receiving treatment for NT/T AML, 80% achieved a CR. The median overall survival for the entire cohort was 4.5 months.