Table 1.

Sources and dilutions of primary antibodies used in the study.

Antibody	Clone	Manufacturer	Dilution
ER	1D5	Dako	1:200
PR	PgR 636	Dako	1:50
HER2	CB11	Ventana	Prediluted
CK5/6	D5/16 B4	Dako	1:50
EGFR	H11	Dako	1:200
Ki67	MIB-1	Dako	Prediluted
P53	D0-7	Novacastra	Prediluted

ER = estrogen receptor, PR = progesterone receptor, HER2 = human epidermal growth factor receptor 2, CK5/6 = cytokeratin 5/6, EGFR = epidermal growth factor receptor, Ki67 = Ki67 nuclear antigen, P53 = human P53 protein