Table 18.

Fields of lymph node dissection according to the location of tumor

Field of lymphadenectomy	Cervical	Upper thoracic	Middle thoracic	Lower thoracic	Abdominal	E = G	GE	Unknown	Total
None	10 (6.3%)	9 (1.5%)	34 (1.5%)	36 (2.3%)	6 (1.6%)	0 (0.0%)	4 (5.2%)	1 (12.5%)	100 (1.9%)
C	31 (19.5%)	14 (2.4%)	31 (1.3%)	17 (1.1%)	1 (0.3%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	94 (1.8%)
C + UM	19 (11.9%)	3 (0.5%)	5 (0.2%)	1 (0.1%)	2 (0.5%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	30 (0.6%)
C + UM + MLM	8 (5.0%)	19 (3.2%)	48 (2.1%)	24 (1.5%)	1 (0.3%)	0 (0.0%)	1 (1.3%)	0 (0.0%)	101 (2.0%)
C + UM + MLM + A	73 (45.9%)	382 (65.3%)	1227 (53.2%)	626 (40.0%)	60 (16.0%)	11 (11.5%)	3 (3.9%)	4 (50.0%)	2386 (46.1%)
C + UM + A	1 (0.6%)	7 (1.2%)	15 (0.7%)	3 (0.2%)	1 (0.3%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	27 (0.5%)
C + MLM	1 (0.6%)	1 (0.2%)	0 (0.0%)	2 (0.1%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	4 (0.1%)
C + MLM + A	1 (0.6%)	2 (0.3%)	13 (0.6%)	9 (0.6%)	2 (0.5%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	27 (0.5%)
C + A	1 (0.6%)	0 (0.0%)	6 (0.3%)	4 (0.3%)	1 (0.3%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	12 (0.2%)
UM	1 (0.6%)	2 (0.3%)	13 (0.6%)	7 (0.4%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	23 (0.4%)
UM + MLM	3 (1.9%)	12 (2.1%)	45 (2.0%)	22 (1.4%)	2 (0.5%)	0 (0.0%)	1 (1.3%)	0 (0.0%)	85 (1.6%)
UM + MLM + A	8 (5.0%)	116 (19.8%)	785 (34.0%)	667 (42.6%)	150 (39.9%)	39 (40.6%)	16 (20.8%)	2 (25.0%)	1783 (34.5%)
UM + A	1 (0.6%)	1 (0.2%)	4 (0.2%)	4 (0.3%)	1 (0.3%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	11 (0.2%)
MLM	1 (0.6%)	4 (0.7%)	4 (0.2%)	11 (0.7%)	2 (0.5%)	2 (2.1%)	2 (2.6%)	0 (0.0%)	26 (0.5%)
MLM + A	0 (0.0%)	6 (1.0%)	62 (2.7%)	114 (7.3%)	109 (29.0%)	37 (38.5%)	29 (37.7%)	0 (0.0%)	357 (6.9%)
A	0 (0.0%)	7 (1.2%)	15 (0.7%)	17 (1.1%)	38 (10.1%)	7 (7.3%)	21 (27.3%)	1 (12.5%)	106 (2.0%)
Total	159	585	2,307	1,564	376	96	77	8	5172

C bilateral cervical nodes, UM upper mediastinal nodes, MLM middle-lower mediastinal nodes, A abdominal nodes