Early bile duct cancer

Table 7 Microscopic classifications and locoregional extensions in early bile duct cancer

	Microscopic classification			Locoregional extensions
	Adenoca	Papillary ca	Others	LV (+)	PN (+)	LN (+)
Cha et al[4] (n = 61)	41(67%)	19 (31%)	1 (2%)	4 (7%)	5 (8%)	1 (2%)
Yamaguchi[6] (n = 7)	3 (43%)	4 (57%)	0	0	0	0
Mizumoto et al[7] (n = 14)	6 (43%)	8 (57%)	0	1 (7%)	0	0
Kurosaki et al[9] (n = 7)		NM		2 (29%)	0	0
Tamada et al[10] (n = 10)	1 (10%)	9 (90%)	0		NM
Lim et al[11] (n = 21)	6 (29%)	13 (62%)	2 (10%)	0	0	1 (5%)
Kozuka et al[36] (n = 13)	3 (23%)	10 (77%)	0		NM

Ca: carcinoma; LV (+): lymphovascular invasion; PN (+): perineural infiltration; LN (+): lymph node metastasis; NM: not mentioned.