Impact of resection margins on long-term survival after pancreaticoduodenectomy for pancreatic head carcinoma

Table 2 Factors associated with microscopically positive resection margin (R2 resection was excluded)

	No. patients		P value
	R0	R1
Total patients	85	38
Age in yr			0.192
≥ 60	47	22
< 60	39	15
Sex			0.719
M	53	23
F	33	14
Tumor size in cm			1.000
< 2	6	3
≥ 2	80	34
Bile duct invasion			0.486
Negative	28	15
Positive	58	23
Duodenal invasion			0.480
Negative	40	12
Positive	46	25
Nerve plexus invasion			0.848
Negative	36	13
Positive	50	24
Lymph node metastasis			0.562
Negative	54	21
Positive	32	16
Venous invasion			0.435
Negative	79	32
Positive	7	5
Postoperative chemotherapy			0.180
No	45	25
Yes	41	12
Postoperative radiotherapy			0.354
No	67	44
Yes	18	4
Operation blood loss in mL	251.61 ± 173.94	299.23 ± 216.67	0.195
Hospital stay in d	16.70 ± 7.98	16.31 ± 5.65	0.786