Table 2 Comparison of characteristics between PD-L1 positive and negative groups

Age > 60 years

50.8% (30)

49.2% (29)

0.25

Males

50% (30)

50% (30)

0.16

Tobacco users

40% (12)

60% (18)

0.04

T stage

 < 0.001

 1. T1 + T2

23 (44.2%)

2 (4.7%)

 2. T3 + T4

29 (55.8%)

40 (95.2%)

N stage

 < 0.001

 1. N0 + N1

17 (32.7%)

1 (2.4%)

 2. ≥ N2

35 (67.3%)

41 (97.6%)

Stage

0.21

 1. IVa

35 (67.3%)

23 (54.7%)

 2. IVb

17 (32.7%)

19 (45.2%)

Metastasis sites > 2

15 (53.6%)

13 (46.4%)

0.82

EGFR mutation positive

15 (53.6%)

13 (46.4%)

0.82