SEER collects information on radiation therapy and chemotherapy given as part of the first-course treatment and makes them available for analysis through custom databases on request.  The radiation treatment variables were removed from the public research database starting with the November 2016 data submission, and chemotherapy has never been released in the research data. These variables are now available through a custom data request process after signing an additional data use agreement that describes the completeness of these treatment variables and the potential biases associated with their use.

How to Access Treatment Data

In order to access the custom database, you must already have access to the 1975-2016 SEER Research Data (November 2018 Submission) through SEER*Stat in client-server mode.

If you have questions, please contact

After access is granted, you will be able to access the databases within SEER*Stat's Client-Server mode. You will also be able to download the ASCII text version of the data. These data are not available via SEER*Stat local mode.

Download this file if you would like to use your own programs to analyze the data in text format. You do not need to download these files if you are using SEER*Stat. SEER does not provide programming support for the analysis of these data. To use this configuration, download the file in the preferred format and uncompress it. File descriptions and documentation are included. Storing the downloaded file and its uncompressed contents will consume approximately 4.3 gigabytes of disk capacity.

Finding the Treatment Databases in SEER*Stat

In each SEER*Stat session type, you will see the current standard research databases and below those, the custom databases with additional treatment fields. They have “Custom Data (with additional treatment fields)” in the database name. Once you are in the correct database, the fields are located in the in the "Therapy" folder.

Additional Treatment Fields Available

1. Radiation Recode

This data item indicates the method of radiation therapy performed as part of the first course of treatment. It is a recode of NAACCR Item #1360.
ASCII Text File:  Position 394, Length 1

Code Description
0 None/Unknown; diagnosed at autopsy
1 Beam radiation
2 Radioactive implants
3 Radioisotopes
4 Combination of 1 with 2 or 3
5 Radiation, NOS—method or source not specified
6 Other radiation (1973-1987 cases only)
7 Patient or patient's guardian refused radiation therapy
8 Radiation recommended, unknown if administered

2. Radiation to Brain or CNS Recode (1988-1997)

This variable was only collected for years 1988-1997 for lung and leukemia cases only. It codes for radiation given to the brain or central nervous system at all facilities as part of the first course of therapy, and is a recode of NAACCR Item #1370. This field is blank for cases diagnosed prior to 1988 and after 1997.
ASCII Text File:  Position 395, Length 1

Code Description
0 None/Unknown
1 Radiation
7 Refused
8 Recommended, unknown if administered

3. Radiation Sequence with Surgery

This field records the order in which surgery and radiation therapies were administered for those patients who had both surgery and radiation.
ASCII Text File:  Position 396, Length 1

Code Description
0 No radiation and/or surgery as defined above
2 Radiation before surgery
3 Radiation after surgery
4 Radiation both before and after surgery
5 Intraoperative radiation therapy
6 Intraoperative radiation with other radiation given before or after surgery
7 Surgery both before and after radiation
9 Sequence unknown, but both surgery and radiation were given

4. Chemotherapy recode (yes, no/unk)

This field records whether chemotherapy was given.
ASCII Text File:  Position 397, Length 1

Code Description
0 None/Unknown
1 Yes