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Synergistic Therapy of Human Ovarian Carcinoma Implanted Orthotopically in Nude Mice by Optimal Biological Dose of Pegylated Interferon Combined with Paclitaxel¹

Departments of Cancer Biology [S. T., C. H. B., S. H., J. J. K., I. J. F.] and Gynecologic Oncology [S. T., S. A., J. K. W.], The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030

The purpose of this study was to optimize the antitumor andantiangiogenic activities of pegylated IFN- (PEG-IFN-)alone or in combination with paclitaxel against SKOV3ip1 human ovarian cancer cells growing orthotopically in female nude mice. Seven days after the i.p. implantation of tumor cells, groups of mice (n = 10) were injected s.c. once per week (for 4 weeks) with different doses of PEG-IFN- (3,500, 7,000, 35,000, and 350,000 units). PEG-IFN- at 7,000 units significantly decreased tumor incidence and volume. At doses exceeding 7,000 units, PEG-IFN- was less efficacious. In another set of studies conducted 7 days after the i.p. implantation of SKOV3ip1 cells, groups of mice (n = 10) received (once per week for 4 weeks) either s.c. administrations of PEG-IFN- (7,000 units), i.p. injections of paclitaxel (100 µg/wk), or a combination of PEG-IFN- and paclitaxel. The mice were killed 7 days after the last treatment, and tumor burden was assessed. Administration of PEG-IFN- at the optimal biological dose (7,000 units) in combination with paclitaxel significantly decreased angiogenesis and progressive growth of human ovarian carcinoma cells in a synergistic fashion. The combination therapy produced the most significant inhibition in expression of the proangiogenic molecules basic fibroblast growth factor and matrix metalloproteinase-9. Decreased microvessel density, decreased proliferating cell nuclear antigen staining, and increased endothelial cell apoptosis also correlated with therapeutic success. Collectively, the data suggest that combining the optimal biological dose of PEG-IFN- with paclitaxel may provide a novel and effective approach to the treatment of human ovarian carcinoma.

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