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  • Title: A novel EWS-CREB3L3 gene fusion in a mesenteric sclerosing epithelioid fibrosarcoma.
    Author: Dewaele B, Libbrecht L, Levy G, Brichard B, Vanspauwen V, Sciot R, Debiec-Rychter M.
    Journal: Genes Chromosomes Cancer; 2017 Sep; 56(9):695-699. PubMed ID: 28569045.
    Abstract:
    Sclerosing epithelioid fibrosarcoma (SEF) is a rare, malignant fibroblastic neoplasm, morphologically composed of cords, nests or sheets of monotonous epithelioid cells within a collagenous matrix. It has been recently characterized by recurrent pathogenic EWS-CREB3L1/2 or FUS-CREB3L2 fusions and common MUC4 protein expression by immunohistochemistry. Typically SEF occur in middle-aged adults and rarely have been reported within the abdominal cavity. Here we report an 18-year-old man with intraabdominal tumor and multiple disseminated liver metastases, presenting pure SEF histologic and immunophenotypic features. Fluorescence in situ hybridization analysis showed unbalanced rearrangement of Ewing sarcoma breakpoint region 1 (EWSR1) gene. Genomic profiling by array CGH, followed by RT-PCR and sequencing analysis, revealed a previously not reported EWSR1 translocation partner, cAMP-responsive element-binding protein 3-like 3 (CREB3L3). The novel EWSR1-CREB3L3 fusion further extends the range of fusion types involving EWSR1 that are characteristic for SEF.
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