Table 2.

Multivariate Cox regression analysis of clinical characteristics.

Variable	Coefficient	HR	Lower.95	Upper.95	p value
Age ≥65 years	0.727	2.069	1.158	3.697	0.014
Grade 2	1.131	3.097	0.676	14.201	0.146
Grade 3	0.976	2.654	0.604	11.665	0.196
Stage II	0.726	2.067	0.881	4.847	0.095
Stage III	1.173	3.231	1.687	6.188	p ≤ 0.001
Stage IV	1.517	4.559	2.006	10.358	p ≤ 0.001
High-risk group	1.064	2.897	1.402	5.986	0.004