Table 2. Four breast cancer data sets used for independent validation.

Data set	TNBC definition	Sample size	Cancer type	Microarray platform	Reference
GSE25066	EsR-, Her2-, PgR-	159	stage I–III breast cancers	Affymetrix Hu133A	[54]
GSE16446	EsR-, Her2-	80	Primary breast cancer	Affymetrix HU133 Plus 2.0	[55]
GSE31448	EsR-, Her2-, PgR-	84	invasive adenocarcinoma	Affymetrix HU133 Plus 2.0	[56]
GSE1456	Basal-like	25	Primary breast cancer	Affymetrix Hu133A	[57]