SEER Training Modules

 0 — In situ

 1 — Localized only

 2 — Regional by direct extension only
 3 — Regional lymph nodes involved only
 4 — Regional by BOTH direct extension AND lymph node involvement
 5 — Regional, NOS (Not Otherwise Specified)

 7 — Distant site(s)/node(s) involved

 9 — Unknown if extension or metastasis (unstaged, unknown, or unspecified) Death certificate only case