Table 1. Gene signature predictive of ER status.

Gene Symbol	Correlation Coefficient	Gene Title
ADCY9	0.44	adenylatecyclase 9
AMFR	0.44	autocrine motility factor receptor
ANXA9	0.43	annexin A9
	0.45
C6orf97	0.45	chromosome 6 open reading frame 97
CA12	0.48	carbonic anhydrase XII
	0.48
	0.47
	0.47
	0.47
CELSR1	0.43	cadherin, EGF LAG seven-pass G-type receptor 1 (flamingo homolog, Drosophila)
CYP2B6 ///	0.45	cytochrome P450, family 2, subfamily B, polypeptides 6, 7
CYP2B7P1
ESR1	0.50	estrogen receptor 1
FAM176B	0.46	family with sequence similarity 176, member B
	0.43
GAMT	0.45	guanidinoacetate N-methyltransferase
GATA3	0.45	GATA binding protein 3
	0.48
	0.47
GFRA1	0.45	GDNF family receptor alpha 1
GREB1	0.46	growth regulation by estrogen in breast cancer 1
IL6ST	0.44	interleukin 6 signal transducer (gp130, oncostatin M receptor)
	0.44
KCNK15	0.44	potassium channel, subfamily K, member 15
KDM4B	0.45	lysine (K)-specific demethylase 4B
	0.46
	0.43
SCCPDH	0.43	saccharopine dehydrogenase (putative)
SCUBE2	0.46	signal peptide, CUB domain, EGF-like 2
LIV1 (SLC39A6)	0.46	solute carrier family 39 (zinc transporter), member 6
SSH3	0.44	slingshot homolog 3 (Drosophila)
STC2	0.44	stanniocalcin 2
TBC1D9	0.43	TBC1 domain family, member 9 (with GRAM domain)
TFF1	0.44	trefoil factor 1
Unknown	0.45	Not annotated

Each row in the coefficient column represents a probe set. Genes, whose levels of expression were previously reported to correlate with ER status are marked in bold. The rows were sorted alphabetically according to the Gene Symbol. For detailed information on the probe sets see Table S1.