Table 1 The clinical characteristics of LUAD patients from the TCGA database

Age (years)

 Mean (SD)

65.4 (10.0)

–

 Median (Min, Max)

66 (33, 88)

–

 < 60

134

27.23

 ≥ 60

358

72.76

Gender

 Female

264

53.66

 Male

228

46.34

Race

 White

385

78.25

 Non-White

59

12.00

 Unknown

48

9.75

Smoking history

 Non-smoker

71

14.43

 Smoker

407

82.72

 Unknown

14

2.85

Clinical stage

 I

266

54.07

 II

120

24.39

 III

80

16.26

 IV

26

5.28

Tumor size (cm)

 T1 (≤ 3)

169

34.35

 T2 (3–5)

258

52.44

 T3 (5–7)

44

8.94

 T4 (> 7)

18

3.66

 Unknown

3

6.10

Lymph node metastasis

 Negative

317

64.43

 Positive

165

33.54

 Unknown

10

2.03

Distant metastasis

 Negative

328

66.67

 Positive

25

5.08

 Unknown

139

28.25