Table 2. Staging based on the staging systems.
| Staging | AJCC 7th staging | AJCC 8th staging | Japanese 11th staging |
|---|---|---|---|
| T staging, n (%) | |||
| 0 | 3 (2.1) | 3 (2.1) | 0 |
| 1a | 32 (22.4) | 32 (22.4) | 35 (24.5) |
| 1b | 69 (48.3) | 69 (48.3) | 69 (48.3) |
| 2 | 13 (9.1) | 13 (9.1) | 13 (9.1) |
| 3 | 26 (18.2) | 26 (18.2) | 26 (18.2) |
| N staging, n (%) | |||
| 0 | 81 (56.6) | 81 (56.6) | 81 (56.6) |
| 1 | 35 (24.5) | 36 (25.2) | 37 (25.9) |
| 2 | 23 (16.1) | 22 (15.4) | 16 (11.2) |
| 3 | 4 (2.8) | 4 (2.8) | 9 (6.3) |
| M staging, n (%) | |||
| 0 | 143 (100.0) | 139 (97.2) | 143 (100.0)) |
| 1 | 0 | 4 (2.8) | 0 |
| Stage grouping, n (%) | |||
| 0 | 3 (2.1) | 3 (2.1) | 32 (22.4) |
| I | 69 (48.3) | 67 (46.8) | 37 (25.9) |
| II | 42 (29.4) | 37 (25.9) | 50 (35.0) |
| III | 29 (20.3) | 30 (21.0) | 24 (16.8) |
| IV | 0 | 6 (4.2) | 0 |
AJCC, the American Joint Committee on Cancer.