From: Comparison of immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH) assessment for Her-2 status in breast cancer
IHC scoring
Her-2 FISH amplified
Her-2 FISH non-amplified
Concordance by IHC
Discordance by IHC
0 and 1+ (n = 26)
5
21
(21/26)80.8%
(5/26)19.2%
2+ (n = 10)
7
3
(7/10)70.0%
(3/10)30.0%
3+ (n = 14)
13
1
(13/14)92.9%
(1/14)7.1%