Table 1 Patient and treatment characteristics for all patients [with ILAs (ILA+) and without ILAs (ILA−)]

Age (year)

.948

 Mean (range)

61 (42–80)

67 (55–80)

60 (42–80)

Gender

1.000

 Male

85

13

72

 Female

10

2

8

Smoking history (pack-year)

.390

 < 40

60

8

52

 ≥40

35

7

28

Tumor stage

.885

 IIa

1

0

1

 IIIa

18

3

15

 IIIb

52

9

43

 IV

24

3

21

Tumor location

.580

 Upper or middle lobe

74

13

61

 Lower lobe

21

2

19

Chemotherapy

.650

 Sequential

75

13

62

 Concurrent

20

2

18

Chemotherapy regimen

.223

 Etoposide+cisplatin

61

7

54

 Etoposide+carboplatin

32

7

25

 Other drugs

2

1

1