Table 1 Baseline characteristics of patients

Sex

Male

114

71.3

Female

46

28.7

Age

<65

87

54.4

≥ 65

73

45.6

Smoking history

Current/former

40

25.0

Never

120

75.0

ECOG PS

0

15

9.4

1

135

84.4

2

10

6.2

Histology

Adenocarcinoma

125

78.1

Squamous cell carcinoma

31

19.4

Other

4

2.5

Degree of differentiation

Low

98

61.3

Low-medium

29

18.1

Medium-high

28

17.5

High

5

3.1

Clinical stage at diagnosis

IIIB-C

21

13.1

IV

139

86.9

Metastatic sites

Intrapulmonary

82

51.3

Extrapulmonary

78

48.7

Tumor size

<5 cm

99

61.9

≥ 5 cm

46

28.8

Unable to measure

15

9.3

Treatment strategies

Mono chemotherapy

57

35.6

Chemotherapy and Bevacizumab

63

39.4

Immunotherapy

33

20.6

Targeted therapy

7

4.4