Table 1 Results of immunohistochemistry and fluorescence in‐situ hybridisation in invasive breast cancer.

Referral IHC FISH	0	1+	2+	3+	N/S	Total
Amplified	0	3*	29	15	6	53
Not amplified	5	10	123	1†	12	151
Unsatisfactory			1		1	2
Total	5	13	153	16	19	206

FISH, fluorescence in‐situ hybridisation; IHC, immunohistochemistry; N/S, not specified.

*IHC repeated: in two cases, heterogenous staining was predominantly 1+, but with foci of 3+, one case was 1+ on repeat IHC.

†IHC repeated: 2+ on repeat.