Abstract
4-1BB (CD137, TNFRSF9) is a costimulatory receptor expressed on several subsets of activated immune cells. Numerous studies of mouse and human T cells indicate that 4-1BB promotes cellular proliferation, survival, and cytokine production. 4-1BB agonist mAbs have demonstrated efficacy in prophylactic and therapeutic settings in both monotherapy and combination therapy tumor models and have established durable anti-tumor protective T-cell memory responses. PF-05082566 is a fully human IgG2 that binds to the extracellular domain of human 4-1BB with high affinity and specificity. In preclinical studies, this agonist antibody demonstrated its ability to activate NF-κB and induce downstream cytokine production, promote leukocyte proliferation, and inhibit tumor growth in a human PBMC xenograft tumor model. The mechanism of action and robust anti-tumor efficacy of PF-05082566 support its clinical development for the treatment of a broad spectrum of human malignancies.






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Acknowledgments
We thank Pfizer La Jolla Comparative Medicine for animal support; Jerry Casperson, James Christensen and Steve Bender for project support; Bart Jessen, Robert Arch, Tim Paradis, Craig Davis, Karin Jooss and Mike Primiano for discussion of the manuscript.
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All authors are current or former employees of Pfizer Inc.
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Fisher, T.S., Kamperschroer, C., Oliphant, T. et al. Targeting of 4-1BB by monoclonal antibody PF-05082566 enhances T-cell function and promotes anti-tumor activity. Cancer Immunol Immunother 61, 1721–1733 (2012). https://doi.org/10.1007/s00262-012-1237-1
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DOI: https://doi.org/10.1007/s00262-012-1237-1