Table 1.

Source, clone, and dilution of used antibodies

Antibody	Clone	Dilution	Company
Molecular subtype related
ER	SP1	1:100	Thermo Scientific, CA, USA
PR	PgR	1:50	DAKO, Denmark
HER-2	Polyclonal	1:1500	DAKO, Denmark
Ki-67	MIB-1	1:1000	Abcam, Cambridge, UK
Cell cycle related
p16	2D9A12	1:200	Abcam, Cambridge, UK
Phospho pRB (S780)	Polyclonal	1:100	Abcam, Cambridge, UK