Table 3.

Positive Predictive Values of Imaging Predictor Variables and Staging Systems

	n	Intraoperative finding						C-index
		Resected		Distant metastasis		Locally advanced
		n	%	n	%	n	%
Suspicious LN on imaging								0.63
None	290	192	66	48	17	50	17
N1	199	89	45	68	34	42	21
N2	55	21	38	24	44	10	18
PV involvement on imaging								0.64
None	268	180	67	51	19	37	14
Unilateral	215	109	51	63	29	43	20
Bilateral or main stem	62	14	23	26	42	22	35
HA involvement on imaging								0.65
None	330	220	67	66	20	44	13
Unilateral	169	73	43	52	31	44	26
Bilateral or main stem	31	2	6	17	55	12	39
Bismuth classification on imaging*								0.62
Left or right hepatic duct only	35	29	83	5	14	1	3
B1	69	48	70	14	20	7	10
B2	55	31	56	14	26	7	10
B3A (right)	172	92	53	51	30	29	17
B3B (left)	109	61	56	28	26	20	18
B4	126	48	38	39	31	39	31
cTNM staging								0.68
1	31	24	77	3	10	4	13
2	113	86	76	17	15	10	9
3	208	122	59	56	27	30	14
4	214	77	36	75	35	62	29
Blumgart T-staging†								0.67
T1	207	148	71	37	18	22	11
T2	168	97	58	48	28	23	14
T3	188	64	34	65	35	59	31
Preoperative risk score								0.75
Low risk, 0–3 points	87	78	90	6	7	3	3
Intermediate risk, 4 points	129	90	70	23	18	16	12
High risk, 5–6 points	231	119	52	65	28	47	20
Very high risk, ≥7 points	119	22	18	57	48	47	20

Numbers present the number of patients with resected, distant metastatic, and locally advanced disease. The percentages represent the positive predictive values of the subgroups of predictor variables and staging systems. The C-index describes the discriminative performance of the respective variables.

^*Bismuth classification describes the extent of bile duct involvement.

^†Numbers do not sum to group totals because three patients could not be classified for the Blumgart T-staging.

LN, lymph nodes; PV, portal vein; HA, hepatic artery.