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Antimetastatic Effects of Blocking PD-1 and the Adenosine A2A Receptor.

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Cancer Res 2014 Jul; 74(14):3652-8

Authors: Deepak Mittal, Arabella Young, Kimberley Stannard, Michelle Yong, Michele W L Teng, Bertrand Allard, John Stagg, Mark J Smyth

Adenosine targeting is an attractive new approach to cancer treatment, but no clinical study has yet examined adenosine inhibition in oncology despite the safe clinical profile of adenosine A2A receptor inhibitors (A2ARi) in Parkinson disease. Metastasis is the main cause of cancer-related deaths worldwide, and therefore we have studied experimental and spontaneous mouse models of melanoma and breast cancer metastasis to demonstrate the efficacy and mechanism of a combination of A2ARi in combination with anti-PD-1 monoclonal antibody (mAb). This combination significantly reduces metastatic burden and prolongs the life of mice compared with either monotherapy alone. Importantly, the combination was only effective when the tumor expressed high levels of CD73, suggesting a tumor biomarker that at a minimum could be used to stratify patients that might receive this combination. The mechanism of the combination therapy was critically dependent on NK cells and IFN?, and to a lesser extent, CD8(+) T cells and the effector molecule, perforin. Overall, these results provide a strong rationale to use A2ARi with anti-PD-1 mAb for the treatment of minimal residual and metastatic disease. Cancer Res; 74(14); 3652-8. ©2014 AACR.

PMID: 24986517 [PubMed - as supplied by publisher]

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