Table IV.

Multivariate analysis using 66 GBC patients of overall survival.

Variable	HR (95% CI)	P-value
UICC T category
Tis/T1a and T1b/T2a and T2b/T3a and T3b	1.4441 (0.5954–3.4837)	0.4106
UICC N category
N0/N1	2.1063 (0.8352–5.6633)	0.1236
Lymphatic permeation
Ly(−)/ly(+)	1.9603 (0.817–5.1008)	0.1463
Venous invasion
v(−)/v(+)	1.5576 (0.6083–4.1683)	0.3631
PD-L1 expression
Negative/Positive	1.5179 (0.6617–3.4817)	0.3245

GBC, gallbladder cancer; HR, hazard ratio; CI, confidence interval; UICC, Union for International Cancer Control; PD-L1, programmed cell death ligand 1.