Table 1. Baseline clinicopathologic characteristics distribution by lung immune prognostic index (LIPI) groups.

Characteristics	Good LIPI	Intermediate LIPI	Poor LIPI	P value
Size, No.	77	63	13
Mean age (years)	63.8	62.5	61	0.50
Sex, No. [%]				0.31
Female	15 [19]	14 [22]	5 [38]
Male	62 [81]	49 [78]	8 [62]
ECOG-PS, No. [%]				0.49
0	17 [22]	8 [13]	1 [8]
1	58 [75]	52 [83]	12 [92]
2	2 [3]	2 [3]	0 [0]
NA	0 [0]	1 [2]	0 [0]
Smoking status, No. [%]				0.29
Current	38 [49]	25 [40]	7 [54]
Former	32 [42]	35 [56]	4 [31]
Never	7 [9]	3 [5]	2 [15]
Histology, No. [%]				0.33
Squamous	28 [36]	21 [33]	2 [15]
Nonsquamous	49 [64]	42 [67]	11 [85]
TNM stage at diagnosis, No. [%]				0.64
IIIB	27 [35]	19 [30]	3 [23]
IV	50 [65]	44 [70]	10 [77]
Brain metastases, No. [%]				0.30
Yes	16 [21]	12 [19]	5 [38]
No	61 [79]	51 [81]	8 [62]
Prior regimens, No. [%]				0.85
1	49 [64]	39 [62]	7 [54]
2	15 [19]	15 [24]	5 [38]
3	8 [10]	4 [6]	1 [8]
4	3 [4]	2 [3]	0 [0]
5	2 [3]	3 [5]	0 [0]

ECOG-PS, Eastern Cooperative Oncology Group Performance Status; NA, not available.