Table 4.

Multivariable analysis OS.

	OR	95%CI	P
chemotherapy	0.06	0.03-0.12	<0.01
surgery	0.29	0.17-0.50	<0.01
location	1.10	1.02-1.20	0.02
grade	0.81	0.67-0.98	0.03

OS, overall survival; OR, odds ratio; CI, confidence interval.