Table 3.

Resection margins for subtypes of malignant tumours

Pancreatic head and distal bile duct tumours	High-volume (N = 500)	Low-volume (N = 653)	P-value
R0, number (%)	299 (59.8)	350 (53.6)	0.035
R1/R2, number (%)	183 (36.6)	268 (41.0)	0.126
Unknown R margin, number (%)	18 (3.6)	35 (5.4)	0.157

Peri-ampullary	High-volume (N = 229)	Low-volume (N = 317)	P-value
R0, number (%)	200 (87.3)	277 (87.4)	0.987
R1/R2, number (%)	20 (8.7)	26 (8.2)	0.825
Unknown R margin, number (%)	9 (3.9)	14 (4.4)	0.780