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- W2954111287 abstract "Abstract The use of checkpoint inhibitor anti-PD1 has achieved significant clinical benefit, in recurrent and metastatic head and neck cancer patients, where the overall response rate is between 16-20%. The use of antigen-specific cancer vaccine to increase the level of cytotoxic T cells is believed to work synergistically with anti-PD1. In this study, we evaluated the efficacy of antigen-specific DNA vaccine when it’s used in combination with anti-PD1. The B6.Cg-Tg(HLA-A/H2-D)2Enge/J mice bearing established tumours overexpressing the tumour antigen were vaccinated either with anti-PD1, DNA vaccine or anti-PD1 in combination with DNA vaccine. Tumour volume was monitored and antigen-specific immune responses were evaluated at the endpoint. Our data demonstrated DNA vaccine induced antigen-specific immune responses and animals vaccinated with DNA vaccine harboured smaller tumour volume compared to controls. Significantly, animals that received DNA vaccine expressed consistently higher levels IFN-γ and resulted in the upregulation of PD1 compared to control animals. We then demonstrated mice vaccinated with both DNA vaccine and anti-PD1 had near to complete tumour control, indicating a synergistic effect of DNA vaccine with anti-PD1. Animals treated with DNA vaccine in combination with anti-PD1 also have better overall survival. Importantly, these animals showed increased antigen-specific responses by the ELISPOT assay. In summary, our data suggest antigen-specific DNA vaccine works synergistically with anti-PD1 and conferred an excellent tumour control; this opens up a new opportunity of combinatory immunotherapy that might benefit a wider population of patients in an antigen-specific manner. Citation Format: Kue Peng Lim, Syafinaz Zainal, Natasha Zulaziz, Chai Phei Gan, San Jiun Chai, Bryan Kit Weng Lye, Chuan Wang, Ruhcha V. Sutavani, Christian Ottensmeier, Emma King, Gareth Thomas, Natalia Savelyeva, Sok Ching Cheong. Combination immunotherapy successfully control tumor growth in a transgenic mouse model [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 1466." @default.
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- W2954111287 date "2019-07-01" @default.
- W2954111287 modified "2023-09-23" @default.
- W2954111287 title "Abstract 1466: Combination immunotherapy successfully control tumor growth in a transgenic mouse model" @default.
- W2954111287 doi "https://doi.org/10.1158/1538-7445.am2019-1466" @default.
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