The effect of delay in fixation on HER2 expression in invasive carcinoma of the breast assessed with immunohistochemistry and in situ hybridisation.

Abstract:

AIMS:Accurate assessment of HER2 status is essential for selection of patients for HER2-targeted treatment such as trastuzumab. This study investigated the hypothesis that delayed fixation impairs HER2 assessment. METHODS:9 carcinomas were received fresh, and samples were fixed immediately or put in fixative at time intervals up to 24 h. All carcinomas were scored as 3+ with immunohistochemistry in properly fixed tissue. RESULTS:2 of 9 carcinomas (95% CIs 6% to 56%) showed reduced immunohistochemical staining with delays in fixation of 1 and 8 h. One carcinoma showed low-level amplification with fluorescence in situ hybridisation (FISH) when properly fixed and was not amplified after delayed fixation. The other carcinomas were amplified at all time points. CONCLUSIONS:Delayed fixation impaired HER2 protein expression assessed using immunohistochemistry in 22% of 3+ carcinomas. HER2 amplification assessed using FISH may be less affected.

journal_name

J Clin Pathol

authors

Lee AH,Key HP,Bell JA,Kumah P,Hodi Z,Ellis IO

doi

10.1136/jclinpath-2013-201978

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

573-5

issue

7

eissn

0021-9746

issn

1472-4146

pii

jclinpath-2013-201978

journal_volume

67

pub_type

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