Table 2: Survival outcome according to different prognostic factors.

Variables 5-Y OS 5-Y PFS
Age < 60 57.2% 43.7%
≥ 60 63.2% 37.6%
P = 0.3 P = 0.3
Sex M 60.8% 43.0%
F 54.4% 35.9%
P = 0.71 P = 0.36
ECOG PS < 2 68.8% 49.7%
≥ 2 41.6% 23.4%
P = 0.007 P = 0.028
Tobacco Yes 60.7% 33.7%
NO 53.1% 40.8%
N/A 60.5% 53.2%
P = 0.75 P = 0.96
LN status Negative 77.8% 65.5%
Positive 35.6% 17.7%
P = 0.0009 P = 0.0005
T-stage T1-T2 66.6% 51%
T3-T4 48.2% 30.6%
P = 0.09 P = 0.22
Stage Group Early (I/II) 77.1% 65.6%
Advanced (III/IV) 45.9% 28.1%
P = 0.028 P = 0.02

Ecog: Eastern Cooperative Oncology Group; Ps: Performance Status; Ln: Lymph Nodes.