a clear trendP = 0.64
As for overall survival, a clear trend for longer OS was observed in patients with age < 65 years (HR = 0.93, 95% CI = 0.69-1.26, P = 0.64), ECOG score = 0 (HR = 0.89, 95% CI = 0.69-1.14, P = 0.36), or never smoked (HR = 0.72, 95% CI = 0.45-1.17, P = 0.18).