Table 1.

Description of datasets.

Data	Disease	Platform	Gene	Sample
D1: Huang et al. (2003) [15]	Breast cancer	Affymetrix	12625	71
D2: Sotiriou et al. (2003) [16]	Breast cancer	cDNA	7650	98
D3: van't Veer et al. (2002) [17]	Breast cancer	Oligonucleotide	24481	78
D4: Sorlie et al. (2001) [18]	Breast cancer	cDNA	8102	58
D5: Rosenwald et al. (2003) [19]	MCL	cDNA	8810	92
D6: Rosenwald et al. (2002) [20]	DLBCL	cDNA	7399	240

Platform: platforms used for profiling; Gene: number of gene expressions measured; Sample: sample size.