Introduction: The TNM classification of breast carcinomas has substantially changed. Both the newly implemented Hungarian breast cancer screening programme and the national cancer registry require the adequate reporting of the disease with particular emphasis on its extent.
Aims: The purpose of this article is to introduce the new TNM classification.
Methods: Description of the breast cancer related definitions and of the general guidelines that have to be applied for the staging of breast carcinomas. The TNM categories are presented in a practical, partly tabulated format with examples and background information.
Conclusion: Breast cancers are advised to be reported according to the new TNM classification from January 2003.