Abstract
In this study, we investigated the therapeutic efficacy of a replication-conditional mutant HSV, G207, for the treatment of liver metastasis of colon carcinoma. Three liver metastasis models in syngeneic BALB/c mice were developed: (i) splenic injection, (ii) splenic and subcutaneous (s.c.) injection, and (iii) orthotopic implantation of CT26 colon carcinoma. In the splenic injection model, G207 was injected into the established splenic tumor on day 7. In the splenic and s.c. injection model, G207 were injected into the established s.c. tumor on days 5 and 8. In the orthotopic implantation model, a piece of CT26 tumor tissue was transplanted onto the wall of the cecum and G207 was injected in the established cecum tumor on day 7. On day 21 or 28, animals were sacrificed and liver metastases were evaluated. In all three models in immunocompetent mice, liver metastases were significantly reduced by intratumoral inoculation with G207 compared to the control. In athymic mice, however, there was no significant therapeutic effect of intratumoral inoculation with G207 on liver metastases. Tumor-specific cytotoxic T-lymphocyte responses were induced in mice treated with G207 in the orthotopic implantation model. These results suggest that intratumoral inoculation of G207, as an in situ cancer vaccine, can be an effective approach against liver metastasis of colon cancer and the efficacy involves tumor-specific T-cell responses.
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Acknowledgements
We thank Robert L Martuza and Samuel D Rabkin (Harvard Medical School) for critical comments on the manuscript and Akira Ohno for his technical assistance. This study was supported in part by grants from the Ministry of Education, Science, Sports, and Culture in Japan, the Human Science Foundation, the Mochida Memorial Foundation for Medical and Pharmaceutical Research, and the Keio Gijuku Academic Development Funds.
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Endo, T., Toda, M., Watanabe, M. et al. In situ cancer vaccination with a replication-conditional HSV for the treatment of liver metastasis of colon cancer. Cancer Gene Ther 9, 142–148 (2002). https://doi.org/10.1038/sj.cgt.7700407
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DOI: https://doi.org/10.1038/sj.cgt.7700407
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