Table 4. Comparison of C-index between our modified staging system and the AJCC 8th TNM staging system at 1-, 2-, 3-year in validation cohort.
CSS | Modified | the AJCC 8th | P | |||
C-index | 95% CI | C-index | 95% CI | |||
AJCC, American Joint Committee on Cancer; CSS, cancer specific survival; 95% CI, 95% confidence interval. | ||||||
1-year | 0.576 | 0.520−0.632 | 0.554 | 0.497−0.611 | 0.698 | |
2-year | 0.615 | 0.555−0.674 | 0.601 | 0.541−0.660 | 0.886 | |
3-year | 0.815 | 0.722−0.909 | 0.742 | 0.622−0.862 | 0.005 |