Describes surgical procedures used to treat the primary site of the reportable tumor. This item records that portion of the first course of treatment given at the reporting facility. See Chapter V, Unresolved Issues, for a discussion of differences in treatment coding among groups and over time.

This data item can be used to compare the efficacy of treatment options.

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 reporting 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.

Codes in addition to the site-specific codes (Refer to the most recent version of STORE for additional instructions.)

00	None. No surgical procedure of primary site. Diagnosed at autopsy.
10-19	Site-specific codes. Tumor destruction; no pathologic specimen produced.
20-80	Site-specific codes. Resection. Path specimen produced.
90	Surgery, NOS; surgical treatment of the primary site was done, but no information on the type of procedure is provided.
98	Site specific codes; special.
99	Unknown. Patient record does not state whether surgical treatment of the primary site was performed, and no information is available. Death certificate-only.