Table 4.

Receptor expression profile of primary breast cancers including estrogen receptor (ER), progesterone receptor (PR) status, HER2/neu status, and Ki67 proliferation index

Patient #	ER (%)	PR (%)	HER2	KI67 (%)	Subtype
1	100	80	−	25	Luminal B HER2−
2	100	20	−	20	Luminal A
3	95	95	−	20	Luminal A
4	50	20	−	25	Luminal B HER2−
5	50	50	−	20	Luminal A
6	0	0	−	15	Basal like
7	95	50	−	15	Luminal A
8	100	30	−	30	Luminal B HER2−
9	85	85	+	20	Luminal B HER2+
10	95	95	−	10	Luminal A
11	1	0	−	50	Basal like
12	95	70	−	25	Luminal B HER2−
13	60	50	−	40	Luminal B HER2−

The molecular subtypes have been defined based on “surrogate markers”