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IFN-alpha2b and thalidomide synergistically inhibit tumor-induced angiogenesis. | LitMetric
Angiogenesis is an absolute requirement for tumor growth and metastasis. The purpose of this study was to evaluate the antiangiogenic activity of interferon-alpha2b (IFN-alpha2b) and thalidomide, as single agents and in combination. The murine dermis model was used to assess tumor-induced angiogenesis in nude mice. Human ACHN (renal), NIH-OVCAR-3 (ovarian), LNCaP (prostate), and SK-Mel-1 (melanoma) tumor cells were inoculated intradermally into the flanks of nude mice. IFN-alpha2b and thalidomide, administered daily, were effective inhibitors of angiogenesis induced by all four tumor types. The combination of IFN-alpha2b and thalidomide caused a synergistic decrease in mean vessel count in tumors that were resistant to the antiproliferative effects of IFN-alpha2b and thalidomide in vitro. This enhanced suppression of angiogenesis translated into synergistic antitumor activity in a xenograft model. Pegylated IFN-alpha (PEG-IFN-alpha2b) (10(6) U) administered once in 10 days was as effective as daily IFN-alpha2b treatment (10(6) U x 10 days). IFN-alpha2b and thalidomide have potentiated antiangiogenic activity when used in combination. A single dose of PEG-IFN-alpha2b (10(6) U) was as effective at suppressing vessel growth as an equivalent dose of IFN-alpha2b given daily for 10 days.
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