From: Chromogenic in situ hybridisation for the assessment of HER2 status in breast cancer: an international validation ring study
IHC
Own CISH (number of signals)
0/1+
2+
3+
n
<5
44
6
104
5
2
1
4
3
9
>6
15
75
92
No signal
0
Total
50
86
211