Table 2. Clinical information of TCGA-LUAD patients.

Covariates	Category	Number
Sex	Females	269
	Males	234
Stages	I	271
	II	118
	III	83
	IV	24
	NA	7
Smokers	1	72
	2	120
	3	133
	4	160
	5	4
Age	<=65	236
	>65	248