Table 2.

Correlations of HER2 Determinations by IHC and FISH

IHC	HER2/CEP17 Ratio
	< 2.0		≥ 2.0		Total
	No.	%	No.	%	No.	%
0	394	97.6	14	3.4	408	100
1	416	95.2	21	4.8	437	100
2	236	79.7	60	20.3	296	100
3	42	19.8	170	80.2	212	100
Total	1,088	80.4	265	19.6	1,353	100

Abbreviations: IHC, immunohistochemistry; FISH, fluorescent in situ hybridization.