表 2. Multivariate Cox regression analysis of OS and CSS in the training cohort (n=246) .

训练集中OS和CSS的多变量Cox回归分析（n=246）

Variable	OS				CSS
	HR	95% CI	P		HR	95% CI	P
HR: Hadds ratio; CI: Confidence interval; OS: Overall survival; CSS: Cancer-specific survival.
Age at diagnosis
18-<65 yr.	1	Ref			1	Ref
≥65 yr.	1.529	1.075-2.177	0.018		1.309	0.886-1.934	0.176
WHO grade
Ⅱ	1	Ref			1	Ref
Ⅲ	5.166	2.339-11.412	<0.001		4.667	1.908-11.417	0.001
Ⅳ	12.208	5.662-26.323	<0.001		13.339	5.725-31.077	<0.001
Surgery
No	1	Ref			1	Ref
PR/STR	1.004	0.628-1.605	0.986		1.255	0.766-2.056	0.367
GTR	1.021	0.577-1.805	0.944		1.176	0.634-2.181	0.607
Radiotherapy
No	1	Ref			1	Ref
Yes	0.328	0.213-0.506	<0.001		0.295	0.189-0.461	<0.001