Lung cancer is the leading cause of cancerrelated mortality in China.1,2Meanwhile,the average life expectancy in the aging population has increased from46 years in 1950 to 75 years in 2010.3The incidence of lung cancer is very low in individuals aged<40 years,and increases with age up to 80–84 or>85 years.Older patients are often excluded from clinical trials because of their limited life expectancy and
