The NCIt OBO Edition project aims to increase integration of the NCIt with OBO Library ontologies. NCIt is a reference terminology that includes broad coverage of the cancer domain, including cancer related diseases, findings and abnormalities.NCI Thesaurus, a controlled vocabulary in support of NCI administrative and scientific activities. Produced by the Enterprise Vocabulary System (EVS), a project by the NCI Center for Biomedical Informatics and Information Technology. National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, U.S.A.