Table 1. Characteristics of included studies.

	Country	Platform	Normal	Mean0	SD0	Tumor	Mean1	SD1
TCGA	USA	NR	99	1.27	0.265	1072	1.84	0.61
GSE42568	Ireland	GPL570	17	3.11	0.859	104	3.61	0.674
GSE162228	China	GPL570	24	6.18	0.328	109	6.86	0.658
GSE7904	USA	GPL570	7	5.54	0.291	43	6.28	0.725
GSE161533	China	GPL570	28	4.49	0.184	28	4.74	0.379