Any significant changes included in the annual data release or the request process are detailed in the SEER Data Change History.
SEER collects cancer incidence data from population-based cancer registries covering approximately 47.9 percent of the U.S. population. The SEER registries collect data on patient demographics, primary tumor site, tumor morphology, stage at diagnosis, and first course of treatment, and they follow up with patients for vital status.
There are now two data products available: SEER Research and SEER Research Plus. This was motivated because of concerns about the increasing risk of re-identifiability of individuals. The Research Plus databases require a more rigorous process for access that includes user authentication through an Institutional Account or a multiple-step request process for Non-Institutional users. View the FAQ about the account types for more information.
Access to 1975-2019 data with exclusions:
Excludes geography, month in dates, and other demographic fields
Who Can Access?
Institutional users automatically get access with Research Plus
For non-institutional users, upgrade current access
For new users, receive SEER*Stat username
Log into SEER*Stat
These include additional fields that SEER collects and makes available through databases that are not part of the standard research data files. For more information, refer to the list of Specialized Databases.
To access these databases, users must already have access to the latest Research Plus data with a valid institutional account and submit a proposal with description of research objectives and analysis plans that will be reviewed for each database requested.
Some specialized databases are only available to researchers inside the U.S.