Defines the type of radiation therapy the patient received at the reporting facility as a part of the first course of treatment.

If central registries wish to study the treatment given at particular facilities, the facility-level treatment fields must be used. The summary treatment fields, conversely, combine information for all facilities that provide first course of treatment for the tumor. Facility-specific fields allow studies of detailed referral patterns and treatment by type of healthcare setting. Knowing what part of the treatment was given at a particular facility also helps resolve consolidation issues.

0	None
1	Beam radiation
2	Radioactive implants
3	Radioisotopes
4	Combination of 1 with 2 or 3
5	Radiation, NOS-method or source not specified
9	Unknown if radiation therapy administered

Note: CoC no longer requires this item effective January 1, 2002. SEER continues to support it as a historically collected and currently transmitted data item.