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Karyotypic abnormalities associated with Epstein-Barr virus status in classical Hodgkin lymphoma.
Cancer Genetics 2016 September
Classical Hodgkin lymphoma (CHL) is morphologically characterized by scattered malignant Hodgkin/Reed-Sternberg (HRS) cells that are far outnumbered by surrounding reactive hematolymphoid cells. Approximately half of all cases of CHL are associated with infection by Epstein-Barr virus (EBV), an oncogenic herpesvirus that expresses a number of proteins thought to contribute to transformation. While a small number of published studies have attempted to identify recurrent cytogenetic abnormalities in CHL, no large case series have explored karyotypic differences between EBV-positive and EBV-negative tumors. Here, we report a two-institution retrospective investigation of cytogenetic features characterizing CHL. In our cohort, cases of EBV-negative CHL were characterized by more complex routine karyotypes than their EBV-positive counterparts (24.6 versus 15.6 independent aberrations per case, P = 0.009). The increased complexity of EBV-negative cases was driven by a number of features suggestive of genomic instability, including a larger number of independent chromosomal breakpoints (P = 0.03) and apparently aneuploid autosomes (P = 0.008). Compelling but nonsignificant trends also suggest a larger modal number and increased marker chromosomes in EBV-negative cases (P = 0.13 and 0.06, respectively). While some of these differences are related to histologic subtype, others appear independent of histology. Finally, a significant subset of EBV-positive tumors has a surprisingly simple karyotype relative to what is normally seen in CHL, an observation suggesting considerable biological and genetic diversity in this disease.
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