<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>An antigen gene that is expressed in a cancer cell, resulting in the production of either a common tumor antigen or specific tumor antigen.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>