30th Annual Meeting and Associated Programs of the Society for Immunotherapy of Cancer (SITC 2015)
Radiation therapy and vaccination against tumor-specific EGFRvIII effectively clears tumors in a murine model of head and neck squamous cell carcinoma
Journal for ImmunoTherapy of Cancer volume 3, Article number: P78 (2015)
EGFRvIII is a constitutively active and tumor-specific deletional mutant of EGFR found in multiple tumor types including glioblastoma multiforme, and has been reported in head and neck squamous cell carcinomas (HNSCC). The deletion of EGFR exons 2-7 results in a novel glycine at the junction and yields a tumor-specific antigen with demonstrated immunogenicity in mice and humans. Using a live-attenuated Listeria monocytogenes- based vaccine expressing a 21-AA neo-peptide from EGFRvIII (LmEGFRvIII), we demonstrated that prophylactic vaccination protects against subsequent challenge with an EGFRvIII-expressing squamous cell carcinoma (SCCVII-EGFRvIII). Similarly, therapeutic vaccination three days post-implantation prevented outgrowth of EGFRvIII-expressing tumors but not parental EGFRvIII-negative tumors. Conversely, we found that LmEGFRvIII vaccination was insufficient to clear large established SCCVII-EGFRvIII tumors despite eliciting large numbers of polyfunctional EGFRvIII-specific CD8+ T cells. We hypothesized that localized inflammation elicited by radiation therapy could recruit EGFRvIII-specific CD8+ T cells into the tumor. We demonstrated that while neither LmEGFRvIII vaccination nor radiation therapy alone were able to control the EGFRvIII-expressing tumors, the combination of LmEGFRvIII and radiation therapy led to tumor regression and durable cures. We are currently exploring the potential mechanisms for their synergy including the role of T cell recruitment, survival and epitope spreading.
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Uhde, L., Bambina, S., Alice, A. et al. Radiation therapy and vaccination against tumor-specific EGFRvIII effectively clears tumors in a murine model of head and neck squamous cell carcinoma. j. immunotherapy cancer 3 (Suppl 2), P78 (2015). https://doi.org/10.1186/2051-1426-3-S2-P78