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TNM and Stage Groupings > Bone
Bone
Primary Tumor (T)
| T Category |
Stage Category Definitions |
| TX |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| T1 |
Tumor 8 cm or less in greatest dimension |
| T2 |
Tumor more than 8 cm in greatest dimension |
| T3 |
Discontinuous tumors in the primary bone site |
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
| Stage |
T |
N |
M |
Grade |
| IA |
T1 |
N0 |
M0 |
G1, 2, Low grade, GX |
| IB |
T2 |
N0 |
M0 |
G1, 2, Low grade, GX |
| IB |
T3 |
N0 |
M0 |
G1, 2, Low grade, GX |
| IIA |
T1 |
N0 |
M0 |
G3, 4, High grade |
| IIB |
T2 |
N0 |
M0 |
G3, 4, High grade |
| III |
T3 |
N0 |
M0 |
G3, 4* |
| IVA |
Any T |
N0 |
M1a |
Any G |
| IVB |
Any T |
N1 |
Any M |
Any G |
| IVB |
Any T |
Any N |
M1b |
Any G |
* Ewing’s sarcoma is classified as G4.
