Table 3.

Comparison of disease-free survival (DFS) between individual stages in the AJCC7 and AJCC8.

Stage	AJCC 7th edition			AJCC 8th edition
	HR	95%CI	P-value	HR	95%CI	P-value
I	Reference	-	-	Reference	-	-
II	1.26	0.55–2.89	0.581	3.93	2.09–7.41	<0.001
III	2.89	1.49–5.63	0.002	7.55	1.81–31.46	0.005
IV	4.74	2.39–9.38	<0.001	5.64	1.73–18.39	0.004

AJCC: American Joint Committee on Cancer, CI: confidence interval, HR: hazard ratio.