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Synergistic antitumor effects of immunotherapy with recombinant interleukin-2 and recombinant tumor necrosis factor-alpha.
Cancer Research 1988 July 16
The antitumor activity of combination therapy with recombinant tumor necrosis-alpha (rhTNF-alpha) and recombinant interleukin-2 (rhIL-2) was assessed against established immunogenic (MCA-106) and nonimmunogenic (MCA-102) sarcomas at both s.c. and visceral (hepatic) sites. C57BL/6 (B6) mice were treated with a single i.v. dose of rhTNF-alpha (2, 4, 6, or 8 micrograms) followed by rhIL-2 (25,000 U) i.p. thrice daily for 5 consecutive days. Synergistic effects as measured by regression of tumor, prolongation of survival, and improved cure rates were found using the combination of rhTNF-alpha plus rhIL-2 compared to rhTNF-alpha alone or rhIL-2 alone in the treatment of the immunogenic sarcoma MCA-106. No significant antitumor effects were observed against the nonimmunogenic MCA-102 sarcoma. These findings were similar for both s.c. and large single hepatic tumor models. The effect of the timing of rhIL-2 injections in relation to rhTNF-alpha administration (concurrent, 2, 4, or 6 days post single rhTNF-alpha dose) was also evaluated. Substantial tumor regression and increased survival times were seen in mice with s.c. tumors when rhIL-2 therapy was delayed as much as 48 h after rhTNF-alpha administration. No antitumor response was noted with the combination compared to rhTNF-alpha alone when rhIL-2 was delayed for greater than 4 days. No increase in lethal toxicity during treatment course of the combination of rhTNF-alpha and rhIL-2 was noted at any schedule compared to single agent rhTNF-alpha therapy. A possible role of rhTNF-alpha in regulation of IL-2-dependent antitumor activity in vivo is discussed.
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