Abstract
The process of metastasis formation in cancer is not completely understood and is the main reason cancer therapies fail. Previously, we showed that dual liposomes simultaneously containing the hemostatic inhibitor, dipyridamole and the anticancer drug, perifosine potently inhibited metastasis, causing a 90% reduction in the number of lung metastases in a murine experimental metastasis model. To gain deeper insight into the mechanisms leading to the inhibition of metastasis by these dual liposomes, in the present study, the development of metastases by MT3 breast cancer cells in a mouse xenograft model was analyzed in more detail with regard to tumor cell settlement and metastatic growth. We found that the development of lung metastases by MT3 tumor cells is essentially dependent on the formation of fibrin clots as a precondition for the pulmonary arrest of tumor cells and the subsequent intravascular expansion of micrometastases before their invasion into the surrounding tissue.






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Acknowledgments
This study was supported by the Federal Ministry of Education and Research of Germany (Biochance PLUS program; PTJ-BIO/0313601). We thank Prof. M. van der Giet for supporting the Ph.D. work of J.W. at the Charite Berlin; M. Becker and M. Lemm (MDC Berlin-Buch) for excellent performance of the animal experiments; and Lipoid GmbH Ludwigshafen for providing us with egg phosphatidylcholine.
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All authors confirm that they have no potential conflict of interest, including any financial, personal, or other relationships with other people or organizations within that could inappropriately influence (bias) their work.
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Wenzel, J., Zeisig, R., Haider, W. et al. Inhibition of pulmonary metastasis in a human MT3 breast cancer xenograft model by dual liposomes preventing intravasal fibrin clot formation. Breast Cancer Res Treat 121, 13–22 (2010). https://doi.org/10.1007/s10549-009-0448-4
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DOI: https://doi.org/10.1007/s10549-009-0448-4