<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A cancer vaccine consisting of an immunogenic peptide derived from the cancer-testis antigen (NY-ESO-1), an antigen found in normal testis and various tumors. Vaccination with NY-ESO-1 peptide vaccine may stimulate the host immune system to mount a humoral and cytotoxic T lymphocyte (CTL) response to cells expressing NY-ESO-1 antigen, resulting in tumor cell lysis.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>