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Medline ® Abstract for Reference 59

of 'Principles of cancer immunotherapy'

Anti-TIM3 antibody promotes T cell IFN-γ-mediated antitumor immunity and suppresses established tumors.
Ngiow SF, von Scheidt B, Akiba H, Yagita H, Teng MW, Smyth MJ
Cancer Res. 2011 May;71(10):3540-51. Epub 2011 Mar 23.
Strategies to activate and rescue exhausted tumor-specific T cells, including the use of monoclonal antibodies (mAb) that block the negative costimulatory receptors CTLA-4 and PD-1 are proving very effective, but TIM3 has been relatively neglected as a target. Here we report an extensive characterization of the therapeutic activity and mechanism of action of an anti-mouse TIM3 mAb against experimental and carcinogen-induced tumors. For the first time we specifically define the mechanism of antitumor action of anti-TIM3 requiring IFN-γproducing CD8(+) T cells and CD4(+) T cells, and a higher ratio of tumor infiltrating CD8(+):CD4(+) T cells correlating with therapeutic success. Interestingly, in some models, anti-TIM3 appeared to be effective sometime before the appearance and accumulation of significant TIM3(+)PD-1(+) T cell populations in tumor bearing mice. Anti-TIM3 displayed modest prophylactic and therapeutic activity against a small fraction of carcinogen-induced sarcomas, but comparative and combination studies of anti-TIM3 with anti-CTLA-4 and anti-PD-1 against experimental and carcinogen-induced tumors suggested that these agents might be well-tolerated and very effective in combination.
Cancer Immunology Program, Trescowthick Laboratories, Peter MacCallum Cancer Centre, St. Andrews Place, East Melbourne, Victoria, Australia.