Table 3.

Number and region of involved lymph nodes in relation to the cancerous depth in SESC of the thoracic esophagus treated by thoracotomy

	m1	m2	m3	sm1	sm2	sm3
Total number	43	37	80	88	113	137
Number of positive LN (%)
≤2	0	1 (2.7)	4 (5)	14 (15.91)	15 (13.27)	29 (21.17)
3–6	0	0	1 (1.25)	2 (2.27)	3 (2.65)	16 (11.68)
≥7	0	0	0	0	0	2 (1.46)
Number of patients regarding regions of positive LN (%)
One region	0	1 (2.7)	4 (5)	15 (17.05)	12 (10.62)	32 (23.36)
Two regions	0	0	1 (1.25)	1 (1.14)	6 (5.31)	15 (10.95)
Three regions	0	0	0	0	0	0