All positive (IHC 3+) and doubtful (IHC 2+) cases were screened by fl uorescence in situ hybridization (FISH). Patients with HER2 gene amplification, normal left ventricular ejection fraction ...
[6] Brügmann A, Lelkaitis G, Nielsen S, et al. Testing HER2 in breast cancer: a comparative study on BRISH, FISH, and IHC. Appl Immunohistochem Mol Morphol. 2011;19(3):203-211.
We were not able to perform FISH on the HER2 equivocal cases (11% of total) for which this procedure is indicated. There was a lack of ability to ensure that the pre-analytical variables were ...