Combination therapy using the cyclooxygenase-2 inhibitor Parecoxib and radioimmunotherapy in nude mice with small peritoneal metastases of colonic origin.
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SourceCancer Immunology Immunotherapy, 55, 1, (2006), pp. 47-55
Article / Letter to editor
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Cancer Immunology Immunotherapy
SubjectCTR 3: Translational research; N4i 1: Pathogenesis and modulation of inflammation; NCEBP 2: Evaluation of complex medical interventions; NCMLS 2: Immune Regulation; ONCOL 3: Translational research; ONCOL 5: Aetiology, screening and detection; UMCN 1.4: Immunotherapy, gene therapy and transplantation; UMCN 1.5: Interventional oncology
BACKGROUND: Inhibition of the COX-2 enzyme has been shown to have a radiosensitizing effect in epithelial cancers. The aim of this study was to investigate whether the efficacy of radioimmunotherapy (RIT) using 131I-labeled anti-CEA monoclonal antibody MN-14 could be enhanced by co-administration of the selective COX-2 inhibitor Parecoxib in mice with small volume (1-3 mm) peritoneal carcinomatosis of colonic origin. METHODS: First, the efficacy of 14 daily injections of Parecoxib monotherapy (0-0.2-1.0-5.0-25.0 mg/kg) was determined in mice with intraperitoneal LS174T xenografts. Second, the influence of Parecoxib (1.0 or 5.0 mg/kg) on the biodistribution of 125I-MN-14 was assessed. Finally, the efficacy of RIT alone [125 microCi 131I-MN-14/mouse approximately 1/4 of the maximal tolerated dose (MTD)] was compared with that of Parecoxib monotherapy and RIT combined with daily injections of Parecoxib (1.0 or 5.0 mg/kg). RESULTS: Parecoxib had no measurable antitumor effect up to the highest dose level (25 mg/kg). Parecoxib had no effect on the uptake of 125I-MN-14 in the intraperitoneal tumor xenografts or on normal tissue distribution. Median survival of the control mice and the mice treated with Parecoxib monotherapy (1.0 or 5.0 mg/kg) was 48.5 days, 52 days and 52 days (P=0.47). RIT alone significantly delayed the growth of the intraperitoneal xenografts resulting in a median survival of 87 days (P<0.0001). Mice treated with RIT + Parecoxib at 1.0 or 5.0 mg/kg had a median survival of 73.5 days and 76 days, respectively, which was not statistically different from survival after RIT alone (P=0.15). CONCLUSION: The COX-2 inhibitor Parecoxib does not enhance the therapeutic efficacy of RIT of experimental small volume peritoneal carcinomatosis of colonic origin.
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