Table 2. Distribution of PAM50 intrinsic subtypes of 24 normal breast tissues (with normal breast-like subtype) and matched cancerous samples with oligonucleotide microarray.

Matched cancerous samples	Normal breast tissues
	Basal-like	HER2-enriched	Luminal A	Luminal B	Normal breast-like	Total
Basal-like	0	1	1	0	2	4
HER2-enriched	0	0	0	1	3	4
Luminal A	1	0	1	1	6	9
Luminal B	1	0	1	0	5	7
Total	2	1	3	2	16	24

Abbreviation: SSP2, SSP without normal breast-like subtype.