Starting with the November 2018 submission of the data, SEER provides several stage variables based on TNM. Beginning with cancer cases diagnosed January 1, 2016, cancer registries in the United States transitioned from collecting cancer stage information using Collaborative Stage (CS) to collecting stage using the TNM classification. TNM categories, stage groups, and definitions used by SEER are based on the TNM Classification of Malignant Tumours, 7th Edition. SEER developed a staging database referred to as the SEER*RSA that provides information about each cancer (primary site/histology/other factors defined).

This page provides resources including Section V of the 2016 SEER Program Manual, comparison and mapping between staging systems, and more information about UICC TNM staging.

Available Resources