Incidental gallbladder cancer diagnosis confers survival advantage irrespective of tumour stage and characteristics

Table 2 Patient and tumour characteristics for the surgical group, n (%)

Variable	IGBC (n = 58)	NIGBC (n = 32)	P value
Median age (range)	63 yr (55.8-71.3)	66 yr (66.0-71.5)	0.302
Gender			0.08
Male	9 (16)	10 (32)
Female	49 (84)	22 (68)
Ethnicity			0.507
Caucasian	39 (67)	23 (72)
Asian	15 (26)	5 (16)
Black	3 (5)	2 (6)
Missing	1 (2)	2 (6)
Median BMI (range)	28.2 (24.3-32.1)	28.2 (24.2-30.7)	0.563
ASA score			0.829
1	4 (7)	2 (6)
2	43 (74)	23 (72)
3	10 (17)	6 (19)
Missing	1 (2)	1 (3)
Median CCI (range)	4 (3-5)	4 (4-6)	0.635
Extent of surgery			< 0.001
Minor resection	57 (98)	24 (75)
Major resection	1 (2)	8 (25)
T stage			< 0.001
CIS	1 (2)	1 (3)
T1a	3 (5)	0
T1b	4 (7)	1 (3)
T2	42 (72)	12 (38)
T3	7 (12)	15 (47)
T4	1 (2)	3 (9)
N status			0.051
N0	41 (71)	16 (50)
N1/2	17 (29)	16 (50)
Histologic type			0.746
CIS	1 (2)	1 (3)
Adenocarcinoma	55 (94)	30 (94)
Adeno-squamous	1 (2)	1 (3)
Mixed	1 (2)	0
Degree of differentiation (CIS excluded)			0.614
Well	7 (12)	4 (13)
Moderate	30 (52)	20 (63)
Poor	12 (21)	5 (16)
Undifferentiated/unclassified	8 (14)	2 (6)
Resection margin			0.169
Negative	53 (91)	26 (81)
Positive	5 (9)	6 (19)
Cystic duct margin on index cholecystectomy	6 (10)	N/A	N/A
Post-operative complications	15 (26)	11 (34)	0.394
Pattern of recurrence			0.628
Local/regional	5 (9)	5 (16)
Distant	6 (10)	5 (16)
Local and distant	2 (3)	1 (3)
Adjuvant chemotherapy	12 (21)	8 (25)	0.502

ASA: American Society of Anesthesiology; CCI: Charlson Comorbidity Index; BMI: Body mass index.