Table 3. Prognostic factors affecting disease-free survival in R0 and R1 resection by multivariate analysis.

Variable	HR (95% CI)	P
T stage	1.77 (0.75 to 4.20)	.19
N stage	1.14 (0.74 to 1.76)	.57
Initial CA 19-9>124 U/mL	0.96 (0.61 to 1.51)	.86
Post-operative CA 19-9>37 U/mL	1.93 (1.20 to 3.08)	.006
R1 resection	1.53 (0.96 to 2.46)	.08
Angiolymphatic invasion	1.46 (0.95 to 2.24)	.09
Venous invasion	2.20 (1.40 to 3.46)	.001
Perineural invasion	0.95 (0.55 to 1.62)	.84