Table 2.

Risk factors analysis of PD-L1 expression in EGFR-mutated patients.

Variables	PD-L1 expression			p-value
	Negative (<1%)	Medium (1–49%)	High (≥50%)
Gender				0.9213
Female	38 (66.67%)	27 (62.80%)	9 (64.29%)
Male	19 (33.33%)	16 (37.21%)	5 (35.71%)
Age				0.6615
Age<65	40 (70.18%)	28 (65.12%)	7 (50.00%)
65≤Age<75	13 (22.81%)	10 (23.26%)	5 (35.71%)
Age≥75	4 (7.02%)	5 (11.63%)	2 (14.29%)
Smoking history				0.6538
Ever	29 (50.88%)	19 (44.19%)	8 (57.14%)
Never	28 (49.12%)	24 (55.81%)	6 (42.86%)
Prior lines of therapy				0.5956
0	1 (1.75%)	3 (6.98%)	1 (7.14%)
1–2	34 (59.65%)	27 (62.79%)	7 (50.00%)
≥3	22 (38.60%)	13 (30.23%)	6 (42.86%)
EGFR status				0.1711
Major	41 (73.21%)	27 (62.79%)	8 (61.54%)
Rare	7 (12.50%)	10 (23.26%)	5 (38.46%)
Others	8 (14.29%)	6 (13.95%)	0 (0.00%)
T790M status				0.0825
Positive	21 (38.18%)	13 (30.95%)	1 (7.14%)
Negative	34 (61.82%)	29 (69.05%)	13 (92.86%)