Table 1.

PD-L1 expression of two independent study cohorts by Immunohistochemistry

	Tianjin cohort	Qingdao cohort	p-values
Gender
Male	58	59	0.318
Female	52	40
Agea	58 (12)	63 (12)	0.438
T stage			0.679
1/2	53	51
3	57	48
PD-L1			0.709
Low	32	27
Medium	45	37
High	33	35
Differentiation			0.663
Well	20	13
Moderate	57	66
Poor	33	20
pTNM stage			0.152
IA/Ib	23	30
IIA/IIb	87	69

p-values were calculated by Chi-Square test

^ap-values were calculated by Mann–Whitney U-test