alexa Tumor specific phage particles promote tumor regression in a mouse melanoma model.
Biomedical Sciences

Biomedical Sciences

Biology and Medicine

Author(s): Eriksson F, Culp WD, Massey R, Egevad L, Garland D,

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Abstract Within cancer research, phage display libraries have been widely used for the identification of tumor targeting peptides and antibodies. Additionally, phages are known to be highly immunogenic; therefore we evaluated the immunotherapeutic potential of tumor specific phages to treat established solid tumors in a mouse model of melanoma. We developed two tumor specific phages, one derived from a peptide phage display library and one Fab expressing phage with known specificity, for the treatment of mice bearing palpable B16-F10 or B16/A2K(b) tumors. Therapy in B16-F10 tumor bearing mice with tumor specific phages was superior to treatment with non-tumor specific phages and lead to delayed tumor growth and increased survival. In B16/A2K(b )tumor bearing mice, therapy with tumor specific phages resulted in complete tumor regression and long-term survival in 50\% of the mice. Histological analysis of tumors undergoing treatment with tumor specific phages revealed that phage administration induced a massive infiltration of polymorphonuclear neutrophils. Furthermore, phages induced secretion of IL-12 (p70) and IFN-gamma as measured in mouse splenocyte culture supernatants. These results demonstrate a novel, immunotherapeutic cancer treatment showing that tumor specific phages can promote regression of established tumors by recruitment of inflammatory cells and induction of Th1 cytokines. This article was published in Cancer Immunol Immunother and referenced in Biology and Medicine

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