Analysis of liver metastasis after resection for pancreatic ductal adenocarcinoma

Table 4 Factors influencing liver metastasis after pancreatectomy for pancreatic ductal adenocarcinoma in patients without risk factors for liver metastasis

	Liver metastasis (n = 4)	Non-liver metastasis (n = 18)	P-value
Location
Head	3	15	0.49
Body and tail	1	3
Size (cm)
< 2	3	6	0.19
≥ 2	1	12
Differentiation
Clear, moderate	0	14	0.01
Poor	4	4
Perineural invasion
Yes	2	13	0.38
No	2	5
T-stage (AJCC, 6th)
1-2	0	2	0.23
3-4	4	16
N-stage
N0	4	11	0.19
N1	0	7
Resection margin
Positive	0	0	NA
Negative	4	18

NA: Not available; AJCC: American Joint Cancer Committee.