期刊
NEOPLASIA
卷 13, 期 4, 页码 327-U167出版社
ELSEVIER SCIENCE INC
DOI: 10.1593/neo.101490
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资金
- Abraxis Bioscience, Inc, Los Angeles, CA
- National Institutes of Health, Illinois William E. McElroy Foundation [1R01-CA140732-01A1]
- Department of Defense Breast Cancer Research Program [BC086079]
INTRODUCTION: Patients with metastatic disease are considered incurable. We previously showed that nabpaclitaxel (nanoparticle albumin-embedded paclitaxel) combined with anti-vascular endothelial growth factor A (VEGF-A) antibody, bevacizumab, eradicates orthotopic small-sized breast tumors and metastasis. Here, we assessed this therapy in two models of advanced (450-600 mm(3)) breast tumors and delineated VEGF-A-dependent mechanisms of tumor resistance. METHODS: Mice with luciferase-tagged advanced MDA-MB-231 and MDA-MB-435 tumors were treated with saline, nab-paclitaxel (10 or 30 mg/kg), bevacizumab (4 mg/kg), or combined drugs. Lymphatic and lung metastases were measured by luciferase assay. Proinflammatory and survival pathways were measured by ELISA, Western blot and immunohistochemistry. RESULTS: Nab-paclitaxel transiently suppressed primary tumors by 70% to 90% but had no effect on metastasis. Coadministration of bevacizumab increased the response rate to 99%, including 71% of complete responses in MDA-MB-231-bearing mice treated concurrently with 30 mg/kg of nab-paclitaxel. This combinatory regimen significantly reduced or eliminated preexisting lymphatic and distant metastases in MDA-MB-231 and MDA-MB-435 models. The mechanism involves paclitaxel-induced NF-kappa B pathway that upregulates VEGF-A and other tumor prosurvival proteins. CONCLUSIONS: Bevacizumab prevents tumor recurrence and metastasis promoted by nab-paclitaxel activation of NF-kappa B pathway. Combination therapy with high-dosed nab-paclitaxel demonstrates the potential to eradicate advanced primary tumors and preexisting metastases. These findings strongly support translating this regimen into clinics.
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