Glossary Term:


TNM staging system



The most commonly used system to stage cancers. The TNM staging system uses 3 key pieces of information.

Letters or numbers after the T, N, and M give more details about each of these factors. To make this information clearer, the TNM descriptions can be grouped together into a simpler set of stages, labeled with Roman numerals (usually from I to IV). In general, the lower the number, the less the cancer has spread. A higher number means a more serious cancer. Also called AJCC staging system.