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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Inhibition of prostate cancer growth by estramustine and etoposide: evidence for interaction at the nuclear matrix.

Metastatic prostate cancer which is refractory to hormone therapy remains an incurable disease for which there is no effective therapy. We have begun to investigate the nuclear matrix, the RNA-protein network of the nucleus that plays an important role in DNA replication and gene expression, as a target for cancer chemotherapy. It was postulated that estramustine phosphate (EMP), an estradiol-nitrogen mustard conjugate that binds to the nuclear matrix, might enhance the cytotoxicity of etoposide (VP-16), a topoisomerase II inhibitor that acts at the level of the nuclear matrix. In a nascent DNA synthesis assay, EMP and etoposide interact to selectively inhibit new DNA synthesis on the nuclear matrix. In vitro, EMP and etoposide appeared to act synergistically to inhibit the growth of the metastatic Dunning rat prostate adenocarcinoma cell line Mat-LyLu as well as the metastatic human prostate adenocarcinoma cell line PC-3. In vivo, EMP and etoposide inhibited prostate adenocarcinoma growth in the Dunning Copenhagen rat model. These data have formed the basis of a Phase I/II clinical trial to examine the effect of EMP and etoposide in patients with stage D hormone-refractory prostate cancer.[1]

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