ERBB2 and breast cancer: In this paper data is reported from the comparison of 365 breast cancer specimens using a new dual color HER2 CISH method (HER2 CISH pharmDxTM Kit, Dako Denmark A/S, Glostrup, Denmark) with two well established and FDA approved HER2 FISH techniques; HER2 FISH pharmDxTM Kit (Dako Denmark A/S, Glostrup, Denmark) and PathVysion HER-2 DNA Probe Kit (Abbot Laboratories, Illinois, USA).