<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A substance that is being studied as a treatment for cancer. It belongs to a family of drugs called antiestrogens.</n0:def-definition><n0:def-source>NCI-GLOSS</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A nonsteroidal 2-phenyl indole and a selective estrogen receptor modulator (SERM) with potential antineoplastic activity. Pipendoxifene antagonizes binding of estradiol to estrogen receptor alpha (ER alpha), thereby inhibiting ER alpha-mediated gene expression, interfering with estrogen activity and inhibiting estrogen-stimulated growth in estrogen-dependent breast cancer. In addition, this agent also exerts intrinsic estrogenic activity depending on the tissue types.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>