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• W2328005536 abstract "Checkpoint molecules like CTLA-4 are important regulators of tumor-specific tolerance, and monoclonal antibodies that block this class of molecules have emerged as important therapeutic modalities in multiple cancer types. Recent data suggest that tumor infiltrating, non-functional (exhausted) CD8 cells may express more than one checkpoint molecule, implying a more subtle control system for modulating CD8 T cell function in vivo. Based on their frequent co-expression on tumor-infiltrating lymphocytes, we investigated the relative roles of PD-1 (programmed death - 1) and LAG-3 (lymphocyte activation gene -3) in tumor tolerance. Single knockout (KO) mice lacking either of these genes were relatively unaffected, with PD-1 KO mice developing a late-onset strain-specific myocarditis. However, double knockout mice (DKO) lacking both PD-1 and LAG-3 developed early autoimmune pathology, with infiltrating lymphocytes present in multiple organs, and eventual lethality. More significantly, DKO mice spontaneously rejected the poorly immunogenic B16 melanoma, while rejection was not observed when either PD-1 or LAG-3 was knocked out individually. Moreover, established tumors in wild-type mice could be cured by combined treatment anti-PD-1 and anti-LAG-3 antibodies, while single antibody treatment was sufficient only to delay tumor outgrowth. Taken together, these data demonstrate a previously unappreciated synergy between these two checkpoint molecules in tumor-specific tolerance, and suggest a novel combinatorial strategy for cancer immunotherapy. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr LB-251. doi:10.1158/1538-7445.AM2011-LB-251" @default.
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• W2328005536 date "2011-04-15" @default.
• W2328005536 modified "2023-09-30" @default.
• W2328005536 title "Abstract LB-251: The checkpoint molecules LAG-3 and PD-1 synergize to maintain tolerance to tumors" @default.
• W2328005536 doi "https://doi.org/10.1158/1538-7445.am2011-lb-251" @default.
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