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- W4361958841 abstract "<div>Abstract<p><b>Purpose:</b> The Ewing sarcoma family of tumors (ESFT) comprises a group of aggressive, malignant bone, and soft tissue tumors that predominantly affect children and young adults. These tumors frequently share expression of the EWS-FLI-1 translocation, which is central to tumor survival but not present in healthy cells. In this study, we examined EWS-FLI-1 antigens for their capacity to induce immunity against a range of ESFT types.</p><p><b>Design:</b> Computer prediction analysis of peptide binding, HLA-A2.1 stabilization assays, and induction of cytotoxic T-lymphocytes (CTL) in immunized HLA-A2.1 transgenic mice were used to assess the immunogenicity of native and modified peptides derived from the fusion region of EWS-FLI-1 type 1. CTL-killing of multiple ESFT family members <i>in vitro</i>, and control of established xenografts <i>in vivo</i>, was assessed. We also examined whether these peptides could induce human CTLs <i>in vitro</i>.</p><p><b>Results:</b> EWS-FLI-1 type 1 peptides were unable to stabilize cell surface HLA-A2.1 and induced weak CTL activity against Ewing sarcoma cells. In contrast, peptides with modified anchor residues induced potent CTL killing of Ewing sarcoma cells presenting endogenous (native) peptides. The adoptive transfer of CTL specific for the modified peptide YLNPSVDSV resulted in enhanced survival of mice with established Ewing sarcoma xenografts. YLNPSVDSV-specific CTL displayed potent killing of multiple ESFT types <i>in vitro</i>: Ewing sarcoma, pPNET, Askin's Tumor, and Biphenotypic sarcoma. Stimulation of human peripheral blood mononuclear cells with YLNPSVDSV peptide resulted in potent CTL-killing.</p><p><b>Conclusions:</b> These data show that YLNPSVDSV peptide is a promising antigen for ESFT immunotherapy and warrants further clinical development. <i>Clin Cancer Res; 18(19); 5341–51. ©2012 AACR</i>.</p></div>" @default.
- W4361958841 created "2023-04-05" @default.
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- W4361958841 date "2023-03-31" @default.
- W4361958841 modified "2023-10-13" @default.
- W4361958841 title "Data from EWS-FLI-1-Targeted Cytotoxic T-cell Killing of Multiple Tumor Types Belonging to the Ewing Sarcoma Family of Tumors" @default.
- W4361958841 doi "https://doi.org/10.1158/1078-0432.c.6522963.v1" @default.
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