Analysis of intratumoral heterogeneity and amplification status in breast carcinomas with equivocal (2+) HER-2 immunostaining.

Abstract:

:Fluorescence in situ hybridization (FISH) and immunohistochemical analysis for assessment of HER-2 status in breast carcinomas are discordant in a significant proportion of cases with equivocal (2+) immunostaining. To evaluate the role of intratumoral heterogeneity and degree of amplification, we performed additional HER-2 immunostains and FISH on tumor-bearing blocks from 20 invasive breast carcinomas with immunohistochemical scores of 2+ with gene amplification and in 18 cases without amplification. Of the amplified cases, 11 (55%) had a 3+ immunohistochemical score on at least 1 additional slide, 8 (40%) remained 2+, and 1 (5%) had a slide scored 1+. All cases rescored 3+ showed high-level amplification in original and repeated FISH; cases remaining 2+ had a heterogeneous FISH profile (low-level amplification or a mosaic mixture of high-level amplified and nonamplified cells) in original and repeated FISH. Of nonamplified cases, 13 (72%) had a 1+ score on at least 1 additional slide, 4 (22%) remained 2+, and 1 (6%) had 1 slide scored 3+. In the nonamplified cases, 17 (94%) showed no amplification in repeated FISH. Significant intratumoral heterogeneity and minimal (low-level) HER-2 amplification account for many breast cancers with 2+ HER-2 protein expression.

journal_name

Am J Clin Pathol

authors

Lewis JT,Ketterling RP,Halling KC,Reynolds C,Jenkins RB,Visscher DW

doi

10.1309/J9VX-ABUG-KC4Y-07DL

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

273-81

issue

2

eissn

0002-9173

issn

1943-7722

pii

J9VXABUGKC4Y07DL

journal_volume

124

pub_type

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