showed a trendp=0.003
Univariate analysis revealed that female gender, young age, and no smoking history showed a trend to association with better OS, and good performance status (21.6 months vs. 16.9 months, p=0.003), less advanced stage (19.1 months vs. 13.2 months, p=0.041), and receiving second-line treatment (20.5 months vs. 15.1 months, p=0.049) were significantly associated with better OS.