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CpG-ODN-based immunotherapy is effective in controlling the growth of metastasized tumor cells

CpG-ODN-based immunotherapy is effective in controlling the growth of metastasized tumor cells,10.1016/j.canlet.2008.09.014,Cancer Letters,Han-A Kim,H

CpG-ODN-based immunotherapy is effective in controlling the growth of metastasized tumor cells   (Citations: 3)
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Synthetic oligodeoxynucleotides (ODN) containing unmethylated CpG motifs (CpG-ODN) act as potent immune stimulators by activating innate immunity through toll-like receptor 9. These immunomodulatory effects of CpG-ODN have been reported to be associated with anti-tumor immunity. In this study, we used a murine B16F10 melanoma model and a CT26 colon cancer model to assess whether CpG-ODN-based immunotherapy was effective in inhibiting tumor cells that have already metastasized to distant organs. Systemic administration of CpG-ODN after melanoma cell injection resulted in a significant inhibition of pulmonary colonization. When CpG-ODN was administered after tumor cell injection, it also inhibited pulmonary metastasis of the tumor cells, albeit to a lesser degree in the latter case. Systemic administration of CpG-ODN after subcutaneous inoculation of CT26 colon cancer cells diminished pulmonary metastasis from the primary tumor sites. Additionally, CpG-ODN also inhibited the growth of pulmonary colonization of the colon tumor cells when CpG-ODN was administered after the primary tumors had been surgically removed. These data indicate that CpG-ODN was effective in inhibiting pulmonary metastasis of the B16F10 melanoma and CT26 colon cancer cells, as well as the growth of metastasized tumor cells. Our results suggest that CpG-ODN-based immunotherapy may be beneficial in controlling micrometastasis after surgery in clinical settings.
Journal: Cancer Letters - CANCER LETT , vol. 274, no. 1, pp. 160-164, 2009
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