TNM Interactive provides the international standard for the description of the anatomical extent of cancer to assist physicians in treatment planning and evaluation of results; prognosis; information exchange; and measuring changes in screening and patient care efforts. In addition to including the 5th edition of TNM Classification of Malignant Tumors by Sobin , the CD will also draw on the contents of the two UICC-sponsored books that complement the Sobin volume-the fourth edition of the TNM Atlas, and the third edition of the TNM Supplement.