Summary
Eight spontaneously occurring solid canine tumors were transplanted subcutaneously into six normal adult dogs immunosuppressed by Cyclosporin A (CyA). Five of six osteogenic sarcomas (OS) and the single thyroid adenocarcinoma proliferated into macroscopic tumors; one OS and the single mastocytoma failed to grow. When CyA treatment was stopped, all but one of the tumors were rejected. Biopsies obtained during CyA administration showed minimal necrosis and inflammation in the tumor. After CyA was stopped, dense lymphocytic infiltrates and marked tumor necrosis were observed. Tissue slices of two lymphomas, single-cell suspension of four lymphomas, and three OS and cells from the OS-derived cell lines D22 and 113 given subcutaneously and intradermally failed to proliferate. Reactivity of lymphocytes from transplante recipients in mixed leukocyte cultures was normal when carried out in normal serum but was suppressed profoundly when serum from the CyA-treated dog was added. These data suggest that CyA allows for engraftment of allogeneic tumors in normal dogs by interfering with host T-lymphocyte function. This model may allow the study of the efficacy of various antitumor treatment regimens in a large animal.
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Deeg, H.J., Hackman, R.C., Weiden, P.L. et al. Growth of canine tumors transplanted into normal adult dogs immunosuppressed by Cyclosporin A. Cancer Immunol Immunother 12, 147–152 (1982). https://doi.org/10.1007/BF00205373
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DOI: https://doi.org/10.1007/BF00205373