Table 2.

Clinical Data

Variable	Classification item	Total (n = 169)
Sex, n (%)	Male	104 (61.5)
	Female	65 (38.5)
Smoking, n (%)	No	103 (60.9)
	Yes	66 (39.1)
Drinking, n (%)	No	124 (73.4)
	Yes	45 (26.6)
ECOG, n (%)	0 points	141 (83.4)
	1–2 points	28 (16.6)
T stage, n (%)	Stage 1	8 (4.7)
	Stage 2	9 (5.3)
	Stage 3	5 (3.0)
	Stage 4	147 (87.0)
N stage, n (%)	Stage 0	33 (19.5)
	Stage 1	57 (33.7)
	Stage 2	37 (21.9)
	Stage 3	42 (24.9)
Differentiation, n (%)	Poorly differentiated	147 (87.0)
	Moderately differentiated	22 (13.0)
Age, median [IQR]		62 [55.0,69.0]
PD-L1 expression	Negative	75 (44.4)
	Positive	94 (55.6)