2. Common meta‐analysis stage scale (current analysis ‐ based on TNM 6th edition).
| T stage | N stage | M stage | Meta‐analysis stage |
| 1, 2 | 0 | 0 | I |
| 1, 2 | 1 | 0 | II |
| 3 | 0 | 0 | II |
| 1, 2 | 2 | 0 | III |
| 3 | 1, 2 | 0 | III |
| Any | Any | 1 | IV |
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