Table 2.

Detailed information of specific AS events involved in final prognostic model by multivariate analysis

	OS				PFS
	HR	95% CI		P	HR	95% CI		P
Risk	32.503	2.105	501.818	0.013	0.040	0.005	0.301	0.002
AJCC
I-II				0.000				0.000
III-IV	16.561	4.728	58.007	0.000	6.939	2.786	17.282	0.000
NA	0.273	0.026	2.876	0.280	11.715	0.674	203.462	0.091
Radiotherapy
No				0.000				0.002
Yes	0.318	0.102	0.995	0.049	0.543	0.198	1.490	0.236
NA	0.023	0.005	0.113	0.000	0.164	0.053	0.504	0.002

HR hazard ratio, AJCC American Joint Committee on Cancer, NA not applicable