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Inovio Pharmaceuticals' Potent hTERT DNA Cancer Vaccine Shows Potential to Reduce Tumors and Prevent Tumor Recurrence
Date:7/24/2013

vade recognition by T-cells.

In the study, Inovio researchers confirmed that vaccination with Inovio's DNA vaccine delivered by adaptive electroporation induced hTERT-specific cellular immune responses with significantly greater T-cell magnitude compared to prior non-Inovio studies. Over four vaccinations there was a significant dose response, showing the value of multiple vaccinations to increase the immune response and highlighting the limitation of alternative technologies that are not amenable to multiple vaccinations such as viral vectors. Vaccination elicited multiple epitopes not only in mice, but also in monkeys, indicating a broad vaccine-induced immune response.

Study results showed that mice vaccinated with Inovio's DNA cancer vaccine and then challenged with a cancerous tumor experienced delayed tumor growth and longer overall survival compared with non-vaccinated mice. Mice first challenged with a tumor and then treated with the hTERT DNA vaccine displayed killing activity of the targeted cancer cells expressing the hTERT antigen, with no killing of normal cells that did not express the hTERT antigen. The treated mice experienced significantly smaller tumors and also longer overall survival. Vaccinated animal results were compared to a control group of animals that did not receive Inovio's DNA cancer vaccine. 

In monkeys, whose TERT is 96% similar to human TERT and therefore a highly relevant model for immunotherapeutic vaccine development, the hTERT DNA vaccine elicited strong and broad TERT-specific immune responses and demonstrated the potential to eliminate tumor cells.

Overall, in these studies researchers observed that administration of a synthetic highly optimized hTERT DNA vaccine delivered with electroporation was capable of breaking immune tolerance, and eliciting robust and diverse antigen-specific CTLs, which are responsible for clearing cancerous cells, as well as a potent antitumor response. A favorable
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SOURCE Inovio Pharmaceuticals, Inc.
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