Table 1.

GEO data sets included in this study

GEO data sets	Year	Country	Platform	Sample	Tumor (n)	Normal (n)
GSE66229	2015	USA	GPL570	GC/Normal	300	100
GSE54129	2017	China	GPL570	GC/ Normal	111	21
GSE13911	2008	Italy	GPL570	GC/ Normal	38	31
GSE19826	2010	China	GPL570	GC/ Normal	12	15
GSE79973	2016	China	GPL570	GC/ Normal	10	10
GSE51725	2013	Japan	GPL570	GC/ Normal	8	2
GSE15459	2009	Switzerland	GPL570	GC	200	0
GSE51105	2014	Australia	GPL570	GC	94	0
GSE35809	2012	Singapore	GPL570	GC	70	0
GSE57303	2014	China	GPL570	GC	70	0
GSE34942	2014	Singapore	GPL570	GC	56	0
GSE22377	2011	Germany	GPL570	GC	43	0
GSE38749	2012	Brazil	GPL570	GC	15	0