Cancer recurrence after surgical resection remains a significant challenge in cancer therapy. Platelets, which accumulate in wound sites and interact with circulating tumour cells (CTCs), can however trigger inflammation and repair processes in the remaining tumour microenvironment. Inspired by this intrinsic ability of platelets and the clinical success of immune checkpoint inhibitors, here we show that conjugating anti-PDL1 (engineered monoclonal antibodies against programmed-death ligand 1) to the surface of platelets can reduce post-surgical tumour recurrence and metastasis. Using mice bearing partially removed primary melanomas (B16-F10) or triple-negative breast carcinomas (4T1), we found that anti-PDL1 was effectively released on platelet activation by platelet-derived microparticles, and that the administration of platelet-bound anti-PDL1 significantly prolonged overall mouse survival after surgery by reducing the risk of cancer regrowth and metastatic spread. Our findings suggest that engineered platelets can facilitate the delivery of the immunotherapeutic anti-PDL1 to the surgical bed and target CTCs in the bloodstream, thereby potentially improving the objective response rate.
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This work was supported by grants from the Alfred P. Sloan Foundation (Sloan Research Fellowship), NC TraCS, the National Institutes of Health (Clinical and Translational Science Award (CTSA, NIH grant 1L1TR001111) to Z.G.) and a pilot grant from the University of North Carolina (UNC) Cancer Center. We acknowledge L. Huang at UNC at Chapel Hill for providing the B16F10-Luc-GFP and 4T1-Luc-GFP cell lines.
Z.G. and C.W. have a pending patent entitled ‘Platelets for delivery of cancer immunotherapeutics’ (patent number, 10620-039PV1).
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Wang, C., Sun, W., Ye, Y. et al. In situ activation of platelets with checkpoint inhibitors for post-surgical cancer immunotherapy. Nat Biomed Eng 1, 0011 (2017). https://doi.org/10.1038/s41551-016-0011
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