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TNM and Stage Groupings > Gastrointestinal Stromal Tumor
Gastrointestinal Stromal Tumor
Primary Tumor (T)
| T Category |
Stage Category Definitions |
| TX |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| T1 |
Tumor 2 cm or less |
| T2 |
Tumor more than 2 cm but not more than 5 cm |
| T3 |
Tumor more than 5 cm but not more than 10 cm |
| T4 |
Tumor more than 10 cm in greatest dimension |
Regional Lymph Nodes (N)
| N Category |
Stage Category Definitions |
| NX |
Regional lymph nodes cannot be assessed |
| N0 |
No regional lymph node metastasis |
| N1 |
Regional lymph node metastasis |
Distant Metastasis (M)
| M Category |
Stage Category Definitions |
| M1 |
Distant metastasis |
| M1a |
Lung |
| M1b |
Other distant sites |
No distant metastasis (no pathologic M0; use clinical M to complete stage group)
Anatomic Stage/Prognostic Groups - Gastric GIST
| Stage |
T |
N |
M |
Mitotic Rate |
| IA |
T1 or T2 |
N0 |
M0 |
Low |
| IB |
T3 |
N0 |
M0 |
Low |
| II |
T1 |
N0 |
M0 |
High |
| II |
T2 |
N0 |
M0 |
High |
| II |
T4 |
N0 |
M0 |
Low |
| IIIA |
T3 |
N0 |
M0 |
High |
| IIIB |
T4 |
N0 |
M0 |
High |
| IV |
Any T |
N1 |
M0 |
Any rate |
| IV |
Any T |
Any N |
M1 |
Any rate |
Anatomic Stage/Prognostic Groups - Small Intestinal GIST
| Stage |
T |
N |
M |
Mitotic Rate |
| IA |
T1 or T2 |
N0 |
M0 |
Low |
| II |
T3 |
N0 |
M0 |
Low |
| IIIA |
T1 |
N0 |
M0 |
High |
| IIIA |
T4 |
N0 |
M0 |
Low |
| IIIB |
T2 |
N0 |
M0 |
High |
| IIIB |
T3 |
N0 |
M0 |
High |
| IIIB |
T4 |
N0 |
M0 |
High |
| IV |
Any T |
N1 |
M0 |
Any rate |
| IV |
Any T |
Any N |
M1 |
Any rate |
Also to be used for esophagus, colorectal, and peritoneum
