Table 4. Prognostic factors affecting overall survival by multivariate analysis.

Variable	HR (95% CI)	P
Age >65 years	1.14 (0.96 to 1.36)	.14
Male	1.18 (0.98 to 1.41)	.08
Performance status (ECOG)	1.42 (1.14 to 1.78)	.002
AJCC stage	1.81 (1.60 to 2.05)	<.001
Initial CA 19-9≥670 U/mL	0.95 (0.76 to 1.18)	.65
Post-treatment CA 19-9≥147 U/mL	2.50 (1.98 to 3.17)	<.001