Abstract
The in vivo anti-tumor effects of a recombinant human hybrid interferon alpha, rHuIFN-alpha A/D, and recombinant murine interferon gamma (rMuIFN-gamma) were evaluated against experimental hepatic metastases and s.c. tumor growth of the murine reticulum cell sarcoma M5076. The 2 interferons were equally active in preventing experimental hepatic metastases. However, the interferons differed in their relative ability to influence the growth of the same tumor when treatment was initiated following injection of tumor cells. Greater efficacy was obtained in the treatment of metastatic foci in the liver with rHuIFN-alpha A/D, while rMuIFN-gamma was more active in the therapy of an s.c. growing M5076 tumor. These results demonstrate that the same tumor growing at different sites can have different relative sensitivities to IFN-alpha and IFN-gamma.
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