Abstract
EVI1 is located on chromosome 3q26 and is up-regulated mostly through an inv(3)(q21q26) or t(3;3)(q21;q26). Chromosomal aberrations involving 3q26 comprise 1-2% of all acute myeloid leukemia (AML). These changes result in overexpression of the EVI1 oncogene. EVI1 transcriptional activation has been reported in up to 10% of AML patients, even in the absence of 3q26 changes, and is an independent indicator of adverse prognosis. Rearrangements of the EVI1 locus are often associated with monosomy 7. We present a case of acute panmyelosis with myelofibrosis with a unique EVI1 amplification within a derivative 8 chromosome, characterized by karyotyping and fluorescence in situ hybridization, conventional high resolution comparative genomic hybridization, as well as by gene expression studies. We conclude that EVI1 overexpression as a consequence of EVI1 gene amplification causes similar biological effects to the changes caused by the typical 3q26 aberrations such as an inv(3)(q21q26) or t(3;3)(q21;q26) with EVI1 gene rearrangements.
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