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A synthetic derivative of estradiol. 4-nitroestrone 3-methyl ether inhibits estrogen sulfotransferase (EST), a progesterone-induced secretory endometrial enzyme which affects estrogen receptor levels. This agent has been shown to be an effective growth inhibitor of some chemically induced animal mammary tumors. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C977\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C977\' NCI Thesaurus)
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