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We previously showed that sodium phenylacetate (NaPa) and carboxymethyl benzylamide dextran (CMDB) are both able to block the tumor growth of the breast cancer cell line MCF-7ras in athymic mice. In this study, we studied the effect of a new molecule: a CMDB esterified by phenylacetic acid (NaPaC). In vitro, NaPaC can inhibit threefold to fourfold more MCF-7ras proliferation than NaPa alone. Furthermore, we showed that the antiproliferative activity of NaPaC was dependent on phenylacetate substitution. In vivo studies showed that a very low dose of NaPaC (15 mg/kg) inhibited the MCF-7ras tumor growth of 60% without animal toxicity. The inhibition of tumor growth was concomitant with a reduction in angiogenesis and an increase in necrosis. Moreover, we demonstrated that NaPaC inhibited the paracrine mitogenic effect of MCF-7ras conditioned medium (CM) on fibroblasts and endothelial cells proliferation.

A novel sodium phenylacetate-dextran derivative ester inhibits the growth and angiogenesis of MCF-7ras breast cancer xenografts