Table 2. A comparison of 5-year overall survival rates of sN2 and nsN2 groups.

5-Year overall survival (%)	sN2 (n = 55)	nsN2 (n = 147)	p*
Overall	46%	36%	0.06
Gender
Male	48%	38%	0.14
Female	44%	40%	0.62
N2 disease (LN)
4R	44%	20%	0.004
5	50%	37%	0.43
6	64%	49%	0.38
7	33%	38%	0.92
8	31%	23%	0.9
9	59%	53%	0.88
Tumor histology
Adenocarcinoma	37%	37%	0.7
Squamous cell carcinoma	61%	32%	0.01
Large-cell carcinoma	22%	39%	0.87
Pulmonary resection type
RUL	45%	28%	0.03
RLL	50%	32%	0.07
RP	34%	28%	0.7
LUL	51%	47%	0.46
LLL	45%	48%	0.37
LP	42%	38%	0.31
T status
T1	38%	36%	0.89
T2	50%	33%	0.15
T3	33%	29%	0.66
T4	37%	38%	0.11
Stages
Stage IIIA	40%	33%	0.27
Stage IIIB	52%	31%	0.14

^*Kaplan–Meier Method. LLL: left lower lobectomy; LN: lymph node; LP: left pneumonectomy; LUL: left upper lobectomy; RLL: right lower lobectomy; RP: right pneumonectomy; RUL: right upper lobectomy