Table 1. Specifications of the reagents and antibodies used in this study.

Antibody	Clone/code	Company	Dilution	Antigen retrieval
EGFR	D3881	Cell Signaling Technology Danvers, MA	1:100	Trilogy; water bath (95 °C 25 min)
HER2	E2-4001/Cat#AH01011	Invitrogen Camarillo, CA	1:400	Citra; steamer 30 min
HER3	2F12/Cat#05-390	EMD Millipore Billerica, MA	1:100	CC1 30 min
HER4	Cat#PA5-16789	Thermo Fisher Scientific Rockford, IL	1:100	Citra; steamer 30 min
cMet (Ventana)	SP44/Cat#790-4430	Ventana Medical Systems Tucson, AZ	Prediluted	CC1 30 min
cMet (Leica)	8F11/NCL-cMet	Leica Biosystems Newcastle, United Kingdom	1:80	Citra; steamer 30 min
Ki67	M1B-1/Cat#M7240	DAKO Carpinteria, CA	1:250	Trilogy; water bath (95 °C 25 min)

EGFR, epidermal growth factor receptor; HER, human epidermal growth factor receptor; cMet, hepatocyte growth factor receptor.