Table 1.

Characteristics of the studies

First author and reference	Region	Number of samples	Year	GEO accession	Platforms	Data Type
Yang Y et al 9	China	17 pair	2017	GSE77509	GPL16791	RNA-seq
Schulze K et al 10	France	10T,10N	2015	GSE62232	GPL570	Gene Chip
Sung WK et al 11	USA	223T,243N	2011	GSE25097	GPL10687	Gene Chip
Yuan SX et al 12	USA	26T,10N	2016	GSE54238	GPL16955	Gene Chip
Neumann O et al 13	Germany	8T,10N	2012	GSE50579	GPL14550	Gene Chip
Roessler S et al 14	USA	212 pair	2010	GSE14520	GPL571 GPL3921	Gene Chip
Melis M et al 15	USA	39T,81N	2014	GSE55092	GPL570	Gene Chip

Note: T, tumor samples; N, non-cancerous samples; pairs, tumor tissues and non-cancerous tissues from the same patient.