nearly significantP value <0.15
Age, sex, smoking status, stage, grade, mutation status, surgical type, and adjuvant therapy were included in the multivariable model if the P value of unadjusted effect was less than 0.3 in the univariable analysis and the P value of the adjusted effect kept significant or nearly significant (P value <0.15) in the multivariable model after adjustment of multiple covariates.