Table VII.
Distribution and differences in risk ratios between the 7th edition of the UICC/AJCC staging system and the proposed novel N staging system.
| Risk ratio (95% CI) | |||
|---|---|---|---|
| N stage | No. | Distant metastasis survival | OS |
| Proposed system | |||
| N0 | 64 (13.0) | 1 | 1 |
| N1 | 161 (32.7) | 7.557 (1.009–56.613)a | 4.596 (1.077–19.609)a |
| N2 | 223 (45.3) | 13.827 (1.903–100.486)a | 10.000 (2.431–41.132)a |
| N3 | 44 (8.9) | 30.123 (3.993–227.251)a | 18.584 (4.282–80.651)a |
| UICC/AJCC system | |||
| N0 | 64 (13.0) | 1 | 1 |
| N1 | 159 (32.3) | 6.316 (0.834–47.812) | 3.955 (0.917–17.050) |
| N2 | 226 (45.9) | 13.288 (1.827–96.612)a | 9.719 (2.361–40.006)a |
| N3a | 11 (2.2) | 51.936 (6.243–432.084)a | 36.384 (7.268–182.153)a |
| N3b | 32 (6.5) | 38.744 (5.091–294.830)a | 23.544 (5.369–103.245)a |
a
P<0.05 compared with N0. OS, overall survival; UICC/AJCC, Union for International Cancer Control/American Joint Committee on Cancer; CI, confidence interval.