Complex translocation (8;8;21) with additional trisomy 4 in acute myelogenous leukemia

which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. A 35-year-old woman was admitted to undergo work-up for fatigue. Her blood leukocyte counts were 17.7×10 9 /L, hemoglobin levels were 6.9 g/dL, and platelet counts were 15×10 9 /L. The bone marrow aspirate showed 63% of blasts with Auer rods and bone marrow eosinophilia was absent.A). We performed fluorescence in situ hybridization analysis using dual-color probes and observed a fusion signal on der(8), a small orange signal (RUNX1T1) on another der(8), and a large orange and a small green signal (RUNX1) on der(21) chromosome on a metaphase cell (B, C). The reverse transcription-polymerase chain reaction (RT-PCR) showed the presence of RUNX1/RUNX1T1 fusion transcript. Complex variant of t(8;21) consists of about 3-4% of t(8;21) acute myelogenous leukemia (AML), and its partner chromosome is very variable. To our knowledge, only 2 cases of chromosome 8 as the partner of complex variant of t(8;21) have been reported. Trisomy 4 is a rare chromosomal abnormality in AML, and rarely occurs along with t(8;21). Although trisomy 4 has been associated with unique morpho-logic and clinical features as well as poor prognosis in AML, the prognostic impact of trisomy 4 in t(8;21) cases requires further evaluation.