Table 5.

Impact of number of resected LNs on recurrence rate n (%)

Depth of invasion	No. of resected LNs	n	Recurrence rate2	r	P
pT1-2	0-14	8	5 (62.5)	-0.253	0.0011
	15-19	33	11 (33.3)
	20-24	40	8 (20.0)
	25-29	28	5 (17.8)
	≥ 30	18	1 (5.6)
pT3-4	0-14	10	8 (80.0)	-0.405	0.0001
	15-19	16	9 (56.2)
	20-24	23	8 (34.8)
	25-29	16	4 (25.0)
	≥ 30	19	3 (15.8)

¹Significance of differences was assumed at P < 0.01;

²Recurrence within 5 years after surgery.