Table 3.

Comparison of PD-L1 expression levels within SQCC study group

Characteristic	PD-L1 expression
	TC					IC
	Negative (n, %)		Any+ (n, %)		P value	Negative (n, %)		Any+ (n, %)		P value
Age (years)					0.579					0.011
<60	12	50%	12	50%		15	63%	9	38%
≥60	11	41%	16	59%		7	26%	20	74%
Sex					1					0.737
Male	18	45%	22	55%		18	45%	22	55%
Female	5	45%	6	55%		4	36%	7	64%
Smoking status					0.761					0.214
Never smoker	17	47%	19	53%		18	50%	18	50%
Smoker	6	40%	9	60%		4	27%	11	73%
Pathologic stage					1					0.579
IIIB	9	43%	12	57%		8	38%	13	62%
IV	14	47%	16	53%		14	47%	16	53%
Mutation status					\					\
EGFR mutant	1	50%	1	50%		1	50%	1	50%
KRAS mutant	0	0%	2	100%		1	50%	1	50%
Other	22	47%	25	53%		20	43%	27	57%