| Item # | Length | Source of Standard | Year Implemented | Version Implemented | Year Retired | Version Retired |
|---|---|---|---|---|---|---|
| 2,851 | 1 | AJCC | 2010 | 12 |
Identifies the presence of distant metastatic involvement of bone at time of diagnosis.
The presence of metastatic bone disease at diagnosis is an independent prognostic indicator, and it is used by Collaborative Staging to derive TNM-M codes and SEER Summary Stage codes for some sites.
Note: This includes only the bone, not the bone marrow.