Table 5. The proposed stage groups.
| Stage group | T classification | N classification | M classification | |
|---|---|---|---|---|
| I | IA | T1 | N0 | M0 |
| IB | T2 | N0 | M0 | |
| II | T3 | N0 | M0 | |
| T1-2 | N1 | M0 | ||
| III | T3 | N1 | M0 | |
| T1-3 | N2 | M0 | ||
| T4 | N0-2 | M0 | ||
| IV | T any | N any | M1 | |
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