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Radiation and Local Anti-CD40 Generate an Effective in situ Vaccine in Preclinical Models of Pancreatic Cancer.


ABSTRACT: Radiation therapy induces immunogenic cell death, which can theoretically stimulate T cell priming and induction of tumor-specific memory T cell responses, serving as an in situ vaccine. In practice, this abscopal effect is rarely observed. We use two mouse models of pancreatic cancer to show that a single dose of stereotactic body radiation therapy (SBRT) synergizes with intratumoral injection of agonistic anti-CD40, resulting in regression of non-treated contralateral tumors and formation of long-term immunologic memory. Long-term survival was not observed when mice received multiple fractions of SBRT, or when TGF? blockade was combined with SBRT. SBRT and anti-CD40 was so effective at augmenting T cell priming, that memory CD8 T cell responses to both tumor and self-antigens were induced, resulting in vitiligo in long-term survivors.

SUBMITTER: Yasmin-Karim S 

PROVIDER: S-EPMC6137176 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Radiation and Local Anti-CD40 Generate an Effective <i>in situ</i> Vaccine in Preclinical Models of Pancreatic Cancer.

Yasmin-Karim Sayeda S   Bruck Patrick T PT   Moreau Michele M   Kunjachan Sijumon S   Chen Gui Zhen GZ   Kumar Rajiv R   Grabow Stephanie S   Dougan Stephanie K SK   Ngwa Wilfred W  

Frontiers in immunology 20180907


Radiation therapy induces immunogenic cell death, which can theoretically stimulate T cell priming and induction of tumor-specific memory T cell responses, serving as an <i>in situ</i> vaccine. In practice, this abscopal effect is rarely observed. We use two mouse models of pancreatic cancer to show that a single dose of stereotactic body radiation therapy (SBRT) synergizes with intratumoral injection of agonistic anti-CD40, resulting in regression of non-treated contralateral tumors and formati  ...[more]

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