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  • Title: Class C CpG oligodeoxynucleotides as a single agent and in combination with radiotherapy efficiently delayed growth of subcutaneous B16F1 tumors.
    Author: Cerkovnik P, Jezersek Novakovic B, Stegel V, Novakovic S.
    Journal: Innate Immun; 2009 Oct; 15(5):313-21. PubMed ID: 19723833.
    Abstract:
    Until now, the anti-tumor efficacy of synthetic oligodeoxynucleotides containing CpG motifs (CpG ODNs) has been reported in a number of preventive and therapeutic tumor models. Predominately class B CpG ODNs were used, relatively little has been reported regarding the class C CpG ODNs. The present study was, therefore, aimed at assessing the ability of CpG ODNs class C applied as a single agent and in combination with radiotherapy to induce the anti-tumor immunity in an experimental tumor model in mice (subcutaneous [s.c.] B16F1). Class C CpG ODNs applied three times as a single agent efficiently delayed the growth of s.c. B16F1 tumors. The combined therapy (CpG ODNs and tumor irradiation) remarkably enhanced the anti-tumor effect. The peritumoral (p.t.) application of CpG ODNs in combination with irradiation increased the number of dendritic cells (DCs) at the tumor site and improved the antigen loading and maturation of DCs. In conclusion, the combined therapy with CpG ODNs and irradiation creates a unique in situ DCs vaccine that could be easily applicable without prior knowledge of tumor antigens.
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