Intraoperative frozen section diagnosis of bile duct margin for extrahepatic cholangiocarcinoma

Table 7 Local recurrence-free survival rates of patients according to the status of the bile duct margin evaluated by frozen section diagnosis

	Duration (yr)	Negative	Borderline	Positive
Total layer
Number of cases		26	31	17
	1	0.916	0.918	0.518
	3	0.769	0.725	0.194
	5	0.769	0.725	0.194
1Epithelial layer
Number of cases		26	30	6
	1	0.916	0.915	0.333
	3	0.769	0.722	0.000
	5	0.769	0.722	0.000

¹Patients with borderline or positive subepithelial layer were excluded.