RT Book, Section A1 Ching, C. Denise A1 Edge, Stephen B. A1 Krishnamurthy, Savitri A1 Singletary, S. Eva A2 Kuerer, Henry M. SR Print(0) ID 6407925 T1 Chapter 13. Initial AJCC Staging T2 Kuerer's Breast Surgical Oncology YR 2010 FD 2010 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-160178-8 LK accesssurgery.mhmedical.com/content.aspx?aid=6407925 RD 2024/03/29 AB Staging is the classification used to define the risk of cancer recurrence and mortality. Cancer staging is useful for assessing prognosis and defining care for individuals and for defining the changes in cancer incidence and outcome for populations. A number of classifications systems for defining the extent or "stage" of cancer are used worldwide, each with its own historical basis and purpose. Three systems are used widely in the United States: the Extent of Disease (EOD) system used by the National Cancer Institute Surveillance, Epidemiology, and End Results Program (SEER); the Summary Stage system used primarily by state cancer registries; and the Tumor, Node, Metastases (TNM) system. The EOD and Summary Stage systems are used by population registries primarily for the purpose of population cancer surveillance. These systems generally do not change over time, allowing evaluation of temporal changes in cancer incidence and presentation.