SEER collects cancer incidence data from population-based cancer registries covering approximately 28 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.
How to Access SEER Data
SEER Research Data
SEER releases a standard set of research data every spring based on the previous November’s submission of data from the registries. The SEER Research Data includes the fields and variables SEER has made available to the public with a signed SEER Data-Use Agreement form.
For access options and datasets included in the release, see Accessing the Data.
Number of Records in the SEER Research Data
The numbers provided in the table below are for the most recent SEER research data release and the previous release. Malignant and In Situ cases are defined using the SEER Behavior Recode for Analysis.
|All Cases *||Malignant Cases||Malignant +
In Situ Cases
|1973-2015 Data (Nov 2017 Submission)**||10,050,814||9,099,524||9,776,139|
|1973-2014 Data (Nov 2016 Submission)||9,675,661||8,662,369||9,429,379|
|Increase from 2016 to 2017 Submission||375,153||437,155||346,760|
|Number of 2015 cases||494,185||426,462||470,399|
* All Cases includes benign and borderline brain and CNS tumors, cases coded as no longer reportable in ICD-O-3 and as only malignant in ICD-O-3 or 2010+. See SEER Behavior Recode for more information.
** Cervix In Situ cases have been removed from the SEER Research Data starting with the November 2017 Submission.
There are additional fields that SEER collects and makes available through databases that are not part of the standard SEER Research Data files. SEER makes these available in specialized databases that can be accessed through the SEER*Stat software with additional approvals.
For more information, refer to the list of Specialized Databases.
SEER Database Details
- Data Documentation - Variable definitions and other documentation related to reporting and using SEER and related datasets.
- PSA Values and SEER Data - explanation for the removal of prostate-specific antigen (PSA) values from SEER data.
- Number of SEER Participants by Race and Hispanic Ethnicity for the percentage of the U.S. population covered for each registry and registry combinations provided in SEER*Stat.