From: Her2 assessment using quantitative reverse transcriptase polymerase chain reaction reliably identifies Her2 overexpression without amplification in breast cancer cases
IHC testing
FISH testing, N (%)
FISH positive
FISH negative
0
0 (0)
44 (100)
1+
13 (100)
2+
6 (12.2)
43 (87.8)
3+
45 (95.7)
2 (4.3)