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An orally bioavailable organoselenium inhibitor of thioredoxin reductase 1 (TrxR1), with potential antineoplastic activity. Upon oral administration, ethaselen specifically binds to the selenocysteine-cysteine redox pair in the C-terminal active site of TrxR1 and inhibits its activity, which may result in growth inhibition and the induction of apoptosis in TrxR1-overexpressing tumor cells. TrxR1, upregulated in many cancer cell types, plays a key role in various redox-dependent cellular pathways, regulates transcription factor activity, inhibits apoptosis, and promotes cell growth and survival. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C116713\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C116713\' NCI Thesaurus)
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