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- W2040369475 abstract "The molecular analysis of the t(11;22) rearrangement involving EWS/FLI-1 genes is likely to be of diagnostic value in Ewing sarcoma (ES) and primitive neuroectodermal tumors (PNET). The objective of the current study was to analyze the immunohistochemical expression of the EWS and FLI-1 proteins in a group of small round-cell tumors (SRCT) to determine their specificity and relevance in their differential diagnosis. Forty-eight cases-10 conventional ES, 4 large-cell ES, 5 PNET, 9 neuroblastomas (NB), 6 undifferentiated synovial sarcomas (SS), 5 rhabdomyosarcomas (RB), 5 non-Hodgkin lymphomas (NHL), 1 round-cell liposarcoma, and 3 mesenchymal chondrosarcomas-were analyzed. Immunocytochemistry was performed on paraffin sections after the LSAB method and antigen retrieval using ethylenediaminetetraacetic acid buffer (pH 6). Primary antibodies included FLI-1 (C-19), EWS (N-18), EWS (C-19), and CD99 (MIC-2). As expected, CD-99 expression was found in 100% of ES/PNET cases, in 2 cases of RB, 2 SS, and 1 NHL. FLI-1 protein was observed as nuclear staining in 16 cases of ES/PNET (84%) and in 4 cases of NHL, 2 NB, and 3 SS. Normal endothelial cells and lymphocytes also were positive. EWS expression (both proteins N-18 and C-19) was detected not only in 95% of ES/PNET cases but also in more than 50% of cases from the other tumoral types (4 of 9 and 7 of 9 NB, 5 of 6 and 6 of 6 SS, 3 of 5 and 5 of 5 RB, and 2 of 5 and 3 of 5 NHL, respectively). Whereas EWS expression does not appear specific for ES/PNET, analysis of FLI-1 expression together with CD-99 is a powerful marker for ES/PNET and important factors in the differential diagnosis of SRCT." @default.
- W2040369475 created "2016-06-24" @default.
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- W2040369475 date "2001-09-01" @default.
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- W2040369475 title "Immunohistochemical Detection of EWS and FLI-1 Proteins in Ewing Sarcoma and Primitive Neuroectodermal Tumors: Comparative Analysis With CD99 (MIC-2) Expression" @default.
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- W2040369475 doi "https://doi.org/10.1097/00129039-200109000-00010" @default.
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