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Two Cases of Primary Intracranial Solitary Fibrous Tumor:Genetic Examination of NAB2-STAT6 Fusion and Its Association with Hemangiopericytoma Asami KIKUCHI 1 , Toshiyuki FUJITA 1,2 , Yuichi TAKAHASHI 1 , Suguru YOKOSAKO 1 , Chika YOSHIMURA 1 , Hiroyuki AKAGAWA 1,2 , Mariko FUJIBAYASHI 3 , Osami KUBO 1 , Hideaki ONDA 4 , Hidetoshi KASUYA 1,2 1Department of Neurosurgery, Tokyo Women's Medical University Medical Center East 2Tokyo Women's Medical University Institute for Integrated Medical Sciences(TIIMS) 3Department of Clinical Pathology, Tokyo Women's Medical University Hospital 4Department of Neurosurgery, Kofu Neurosurgery Hospital Keyword: solitary fibrous tumor , hemangiopericytoma , NAB2-STAT6 fusion , fusion protein pp.641-648
Published Date 2015/7/10
DOI https://doi.org/10.11477/mf.1436203090

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  • Abstract
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 Using whole exome and transcriptome sequencing, NAB2-STAT6 gene fusions have recently been identified in patients with solitary fibrous tumors(SFT). We report two cases of SFT in which NAB2-STAT6 fusions were identified. The patients were a 32-year-old man with a parasagittal tumor involving the superior sagittal sinus, and a 40-year-old man with a cerebellar convexity tumor partially involving the transverse sinus. Their tumors were gross totally resected and diagnosed to be SFT according to the following pathological findings:the tumors were composed of spindle cells with a patternless architecture, with prominent stromal collagen and staghorn vessels. An immunohistochemical study yielded positive results for CD34, CD99, and Bcl-2 and negative results for EMA, GFAP, and S100. The MIB-1 indexes were 13 and 7%, respectively. NAB2-STAT6 fusions were detected in both cases with a common fusion variant, NAB2ex6-STAT6ex16/17. We also identified NAB2-STAT6 fusions in two hemangiopericytomas diagnosed in the past with a common variant of NAB2ex6-STAT6ex16/17. These findings suggest that solitary fibrous tumor and hemangiopericytoma may be diagnosed based on the presence of NAB2-STAT6 fusion, and not classified separately because of the same genetic background.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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