Table 1. Clinical information of the enrolled patient cohort.

	All patients (n=250)	SCC patients (n=100)	ADC patients (n=150)	P value
Age (year)	62.86±9.46	64.52±8.02	61.76±10.15	<0.001a
Gender				<0.001a
Female	92	3	89
Male	158	97	61
Smoking history				<0.001a
Yes	127	84	43
No	123	16	107
Tumor diameter (mm)	50.48±34.78	66.37±35.03	39.90±30.28	<0.001a
TNM staging	263	103	160	<0.001a
I	49	8	41
II	116	34	82
>II	98	61	37

^aStatistically significant. SCC, squamous cell carcinoma; ADC, adenocarcinoma; TNM, tumor-node-metastasis.