Table 1 Patient and tumour characteristics

Age (years, median, range)

64 (30–80)

0 (0)

Gender

0 (0)

 Male

52 (59)

 Female

36 (40)

BMI (kg/m², median, range)

24.54 (17.6–35.4)

8 (9)

ASA

0 (0)

 1

6 (7)

 2

53 (60)

 3

29 (33)

Cholangitis

12 (14)

0 (0)

Biliary drainage

56 (64)

0 (0)

 Endoscopic

44 (50)

 Percutaneous transhepatic

2 (2)

 Both

10 (11)

CEA serum level (μg/L)

2.55 (0.7–18.8)

50 (57)

CA19-9 serum level (kU/L)

151 (1–3215)

36 (41)

Bismuth-Corlette classification

0 (0)

 Type I

12 (14)

 Type II

19 (22)

 Type IIIa

20 (23)

 Type IIIb

25 (28)

 Type IV

12 (14)

Pathological T-stage

0 (0)

 Tis

1 (1)

 T1

12 (14)

 T2

65 (74)

 T3

6 (7)

 T4

4 (5)

Pathological N-stage

4 (5)

 pN0

46 (52)

 pN1

33 (38)

 pN2

5 (6)

Differentiation grade

24 (27)

 Well (G1)

20 (23)

 Moderate (G2)

30 (34)

 Poor (G3)

14 (16)

Tumour diameter (mm, median, range)

26 (10–80)

19 (22)

Total number of lymph nodes (median, range)

8 (1–22)

7 (8)

Positive lymph nodes (median, range)

2 (1–13)

1 (1)

ECLNI

14 (16)

1 (1)

Perineural invasion

69 (78)

2 (2)

Resection margin

0 (0)

 R0

74 (84)

 R1

14 (16)

pRM

38 (43)

 ≤ 1 mm

36

 > 1 mm

14