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• W2152376278 abstract "Abstract Purpose: The paucity of new drugs for the treatment of Ewing sarcoma (EWS) limits the cure of these patients. CD99 has a strong membranous expression in EWS cells and, being also necessary for tumor survival, is a suitable target to aim at. In this article, we described a novel human monospecific bivalent single-chain fragment variable diabody (dAbd C7) directed against CD99 of potential clinical application. Experimental Design: In vitro and in vivo evaluation of cell death and of the molecular mechanisms triggered by anti-CD99 agents were performed alone or in combination with doxorubicin to demonstrate efficacy and selectivity of the new dAbd C7. Results: The dAbd C7 induced rapid and massive EWS cell death through Mdm2 degradation and p53 reactivation. Mdm2 overexpression as well as silencing of p53 in p53wt EWS cells decreased CD99-induced EWS cell death, whereas treatment with nutlin-3 enhanced it. Furthermore, cell death was associated with induction of p21, bax, and mitochondrial depolarization together with substantial inhibition of tumor cell proliferation. Combined treatment of anti-CD99 dAbd C7 with doxorubicin was additive both in vitro and in vivo against EWS xenografts. Normal mesenchymal stem cells showed no p53 activation and were resistant to cell death, unless transformed by EWS-FLI, the oncogenic driver of EWS. Conclusions: These results indicate that dAbd C7 is a suitable candidate tool to target CD99 in patients with EWS able to spare normal stem cells from death as it needs an aberrant genetic context for the efficient delivery of CD99-triggered cell death. Clin Cancer Res; 21(1); 146–56. ©2014 AACR." @default.
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• W2152376278 date "2015-01-01" @default.
• W2152376278 modified "2023-10-18" @default.
• W2152376278 title "CD99 Triggering in Ewing Sarcoma Delivers a Lethal Signal through p53 Pathway Reactivation and Cooperates with Doxorubicin" @default.
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• W2152376278 doi "https://doi.org/10.1158/1078-0432.ccr-14-0492" @default.
• W2152376278 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25501132" @default.
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