Table 2.
MTC staging system.
| Stage | T (Primary Tumor) | N (Regional Lymph Nodes) | M (Distant Metastasis) |
|---|---|---|---|
| I | T1a, T1b | N0 | M0 |
| II | T2, T3 | N0 | M0 |
| III | T1–T3 | N1a | M0 |
| IVA | T1–T3 | N1b | M0 |
| T4 | Any N | M0 | |
| IVB | T4b | Any N | M0 |
| IVC | Any T | Any N | M1 |
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