Details of each database available in SEER*Stat are provided below. We provide a database dictionary and a data description document to describe all the variables in the Research and Research Plus databases. We also provide a summary by SEER*Stat session type of the available databases and main characteristics of each database.

Documentation of SEER*Stat Variables

  • Dictionary of  SEER Variables: Excel (XLSX, 39 KB) or PDF (PDF, 300 KB) - Updated October 2024
    Lists all the variables in the SEER*Stat databases with the following information: NAACCR item number, description and definitions, category name, and availability in the Research, Research Plus, and SEER 22 Limited-Field databases (see SEER Data Change History for more information).
  • Data Description for SEER Research and Research Plus (PDF, 889 KB) - Updated October 2024
    Provides documentation for each of the variables in the Research and Research Plus databases.

County attribute data from the U.S. Census are also linked to the SEER*Stat databases. Variables available are dependent on the type of database:

  • Research databases have two time-dependent fields available: Median Household Income and Rural-Urban Continuum Codes.
  • Research Plus databases have many fields available from the two types of county attributes: Static and Time-Dependent.

Number of Records in the SEER Data

Registries (Years) All Cases ** Malignant Cases Malignant +
In Situ Cases
SEER 22 (2000-2021) 17,666,410 15,832,361 17,147,062
SEER 22 (2021) 941,552 825,654 906,446
SEER 17 (2000-2021) 9,750,718 8,687,472 9,466,337
SEER 17 (2021) 526,066 458,206 507,326
SEER 12 (1992-2021) 5,483,707 4,922,907 5,349,589
SEER 12 (2021) 234,883 203,036 225,917
SEER 8 (1975-2021) 5,094,903 4,633,916 4,996,613
SEER 8 (2021) 171,992 147,279 165,268

* Registries included in the data are defined in Registry Groupings in SEER Data and Statistics.
** All Cases includes cases coded as benign and borderline malignancy tumors in ICD-O-3.

Databases by SEER*Stat Session Type

Rate Sessions

Case Listing and Frequency Sessions

Prevalence Sessions

Survival and Left-Truncated Life Table Sessions

MP-SIR/SMR Sessions