Frequently asked questions regarding the application of the TNM classification

he TNM Project of the International Union Against Cancer (UICC)maintains a “TNM Helpdesk” on the Internet to provide answersto problems arising in the staging of tumors. This service can beaccessed through the UICC TNM homepage (http://www.uicc.org/tnm). Examples of frequently asked questions concerning the appli-cation of TNM are as follows: