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Title: Real-time reverse transcription-PCR and fluorescence in-situ hybridization are complementary to understand the mechanisms involved in HER-2/neu overexpression in human breast carcinomas
Authors: Vanden Bempt, Isabelle ×
Vanhentenrijk, Vera
Drijkoningen, Maria
Wlodarska, Iwona
Vandenberghe, Peter
Peeters, Christiane #
Issue Date: Apr-2005
Series Title: Histopathology. vol:46 issue:4 pages:431-41
Abstract: AIMS: To evaluate the HER-2/neu status at the mRNA and DNA level of breast carcinomas and to compare it with HER-2/neu receptor overexpression by immunohistochemistry (IHC). METHODS AND RESULTS: In 32 invasive breast carcinomas, frozen tissue was available for real-time detection of HER-2/neu mRNA levels by reverse transcription-polymerase chain reaction (RT-PCR). Corresponding paraffin sections were examined by IHC and fluorescence in-situ hybridization (FISH). Thereby, different IHC and FISH procedures were compared. Using microwave epitope retrieval, all 32 cases scored 3+ on IHC, whereas only 28 out of 32 cases scored IHC 3+ using water bath epitope retrieval. All of these 28 cases showed increased levels of HER-2/neu mRNA. Dual-colour FISH analysis showed corresponding gene amplification in all 28 cases, with two cases showing a peculiar amplification pattern. In the remaining four cases, scoring IHC 2+ using water bath epitope retrieval, mRNA levels were not elevated. Three cases did not have gene amplification and one case showed low-level HER-2/neu gene amplification. All four carcinomas showed chromosome 17 polysomy. CONCLUSIONS: Real-time RT-PCR is accurate in selecting breast carcinoma cases scoring 3+ by IHC with high-level gene amplification. Results obtained by dual-colour FISH suggest that mechanisms leading to HER-2/neu receptor overexpression may be different between carcinomas scoring 2+ and 3+ on IHC, with polysomy 17 found in the former and gene amplification in the latter.
ISSN: 0309-0167
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Translational Cell & Tissue Research
Clinical Genetics Section (-)
Laboratory for Genetics of Malignant Disorders
Interdepartmental Platform Hospital Care
Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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