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Antitumor effects of combined transfer of P16 and cytokine genes were investigated in this study. The adenovirus harboring the P16 gene (AdP16) and murine granulocyte-macrophage colony-stimulating factor gene (AdGM-CSF) were utilized for the treatment of established tumors. The mice were inoculated subcutaneously with Renca cells and, 6 days later, received an intratumoral injection of AdP16 in the presence or absence of AdGM-CSF. The results demonstrated that tumor-bearing mice treated with AdP16 in combination with AdGM-CSF showed more potent inhibition of tumor growth and survived much longer than did mice treated with AdP16, AdGM-CSF, adenovirus expressing beta-galactosidase, or phosphate-buffered saline alone (P&lt;.01). The tumor mass showed obvious necrosis and inflammatory cell infiltration, and more CD(4)(+) and CD(8)(+) T cells infiltrating the tumor after combined therapy. After combined therapy, the expression of MHC-1 (H-2K(d)) and Fas molecules on freshly isolated tumor cells increased greatly. The activity of specific cytotoxic T lymphocytes was also found to be induced more significantly after the combined therapy (P&lt;.01). Our results demonstrated that combined therapy with P16 and GM-CSF genes can inhibit the growth of established tumors in mice significantly and induce antitumor immunity of the host efficiently.

Adenovirus-mediated combined P16 gene and GM-CSF gene therapy for the treatment of established tumor and induction of antitumor immunity