<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A drug that prevents the formation of estradiol, a female hormone, by interfering with an aromatase enzyme. Aromatase inhibitors are used as a type of hormone therapy for postmenopausal women who have hormone-dependent breast cancer.</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>Any substance that inhibits aromatase, an enzyme responsible for the conversion of cholesterol to pregnenolone and the peripheral aromatization of androgenic precursors into estrogens. Inhibition of aromatase results in the suppression of estrogen-regulated processes.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>