NAACCR Item #1149: Toronto Stage Group
| Item # | Length | Source of Standard | Year Implemented | Version Implemented | Year Retired | Version Retired |
|---|---|---|---|---|---|---|
| 1149 | 3 | NAACCR/SEER | 2025 | 25 |
NAACCR XML:
Tumor.torontoStageGroup
Description
Toronto Stage Group is derived using the Toronto Stage Data Items (Toronto T **\[9628\]**, Toronto N **\[9629\]** and Toronto M **\[9630\]**) algorithm. Other data items may be included in the derivation process. Effective for cases diagnosed 1/1/2025 and forward.
Rationale
Toronto Stage Group can be used to evaluate disease spread at diagnosis, treatment patterns and outcomes over time.