Table 1. Summary of patient characteristics of three GEO datasets.

GEO accession	GSE19188	GSE33532	GSE44077
No. of patients
Health	65	0
Tumor	91	20
Mean age (years)	62.9	63	NA
Gender
Male	109	16	11
Female	47	4	9
Histological type
ADC	32	11	14
SCC	27	4	5
LCC	13	0	0
Other	19	5	1
Stage
I	57	14	14
II	29	6	4
III	5	0	2

GEO, Gene Expression Omnibus.