| Item # | Length | Source of Standard | Year Implemented | Version Implemented | Year Retired | Version Retired |
|---|---|---|---|---|---|---|
| 2,800 | 3 | AJCC | 2003 | 10 |
Records the largest dimension or diameter of the primary tumor in millimeters.
Tumor size at diagnosis is an independent prognostic indicator for many tumors and it is used by Collaborative Staging to derive some TNM-T codes.