Table 1.

Clinical features of lung adenocarcinoma (LUAD) patients in TCGA database

Feature	N (477)	%
Age (years)
≦ 65	247	51.8
> 65	230	48.2
Vital status
Alive	320	67.1
Dead	157	32.9
Gender
Female	257	53.9
Male	220	46.1
TNM stage
Stage I	253	53.0
Stage II	113	23.7
Stage III	78	16.4
Stage IV	25	5.2
Unknown	8	1.7
T stage
T1	159	33.3
T2	254	53.2
T3	43	9.0
T4	18	3.8
Unknown	3	0.6
N stage
N0	307	64.4
N1	90	18.9
N2	67	14.0
N3	2	0.4
Unknown	11	2.3
M stage
M0	313	65.6
M1	24	5.0
Unknown	140	29.4