Table 2. PD-L1 expression stratified by sex, ECOG performance status, and smoking history.

	PD-L1 ≤ 50%	PD-L1 > 50%	Overall (n = 48)	p-value
Sex				0.624
Male	23 (61)	15 (39)	38 (100)
Female	6 (60)	4 (40)	10 (100)
Smoking history				0.429
Current	8 (53)	7 (47)	15 (100)
Former	17 (61)	9 (39)	28 (100)
Never	2 (40)	3 (60)	5 (100)
Not specified	2 (100)	0 (0)	2 (4)
ECOG performance status				0.597
0–1	21 (60)	14 (40)	25 (100)
2–3	8 (62)	5 (38)	13 (100)

ECOG: Eastern Cooperative Oncology Group. Figures represent absolute numbers (and %).