Table 1.

Seven gene expression profiles for breast cancer tissues.

	Study (reference)	Number of samples	Number of gene symbols used	Platform	Main focus
1	Hawthorn et al., 2010	20	19,803	U133_Plus_2	IDC (expression analysis)
2	Chen et al., 2008	185	19,803	U133_Plus_2	Malignancy-risk gene signature
3	Pedraza et al., 2008	58	19,803	U133_Plus_2	Gene expression signatures
4	Yu et al., 2008	341	12,632	U133A	Modulation metastasis and survival
5	Alimonti et al., 2010	47	19,803	U133_Plus_2	Breast tumor expression
6	Yao et al., 2011	142	16,546	cDNA	Recovery of biological information
7	Richardson et al., 2007	62	19,803	U133_Plus_2	Expression data