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Intralesional lipid-complexed cytokine/superantigen immunogene therapy for spontaneous canine tumors

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Abstract

These studies sought to determine the gene expression and short-term effects of intralesional lipid-complexed immunogene therapy with constructs encoding Staphylococcus aureus enterotoxin A and canine interleukin-2 (L-SEA/cIL-2) in dogs with tumors of various histotypes, and then to assess the safety and efficacy of repeated L-SEA/cIL-2 injections in dogs with spontaneous soft tissue sarcomas (STS). In the first study, pet dogs with a variety of tumors received a single intralesional injection of L-SEA/cIL-2, and surgical excision was performed 48 h later. In the second study, dogs with histologically confirmed STS were treated weekly for a maximum of 12 weeks with escalating doses of L-SEA/cIL-2. Tumors were then surgically excised and assessed histologically and immunohistochemically. Overall, treatments were well tolerated, with no dose-limiting toxicities encountered. At 48 h, in the single injection study, plasmid DNA was detected in 14 of 16 tumor samples, and plasmid-specific mRNA was detected in 3 of 14. In the multiple injection study, the overall response rate in dogs with STS was 25%, consisting of 3 complete responses (CR) and 1 partial response (PR). Diffuse lymphoplasmacytic inflammation was observed in all tumors from patients experiencing CR or PR, whereas these changes were not evident in tumors from nonresponders. The infiltrate was composed primarily of CD3+ cells at 48 h from the single-injection study, and was composed of both CD3+ and CD79a+ cells at 12 weeks in responding dogs from the multiple-injection study. In conclusion, these studies suggests that intralesional L-SEA/cIL-2 immunotherapy is well tolerated, results in detectable transgene expression in canine tumors, and has antitumor activity in dogs with spontaneous STS.

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Acnowledgements

The authors would like to dedicate this manuscript to their esteemed colleague and coauthor, the late Dr. E. Gregory MacEwen. They would also like to acknowledge the expert technical assistance of Lynda Beaver, Jean Tullis, and Robin Serino.

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Correspondence to Douglas H. Thamm.

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Thamm, D.H., Kurzman, I.D., Macewen, E.G. et al. Intralesional lipid-complexed cytokine/superantigen immunogene therapy for spontaneous canine tumors. Cancer Immunol Immunother 52, 473–480 (2003). https://doi.org/10.1007/s00262-003-0387-6

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  • DOI: https://doi.org/10.1007/s00262-003-0387-6

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