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Updated: Jul 16, 2026
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Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
Quantitative real-time PCR analysis and microarray-based RNA expression of HER2 in relation to outcome
J Bergqvist1, J F Ohd, J Smeds
1Department of Oncology and Pathology, Karolinska Institute and University Hospital, Stockholm, Sweden. jenny.bergqvist@ki.se
Summary
Quantitative real-time PCR (Q-PCR) and RNA expression profiles (RNA-EPs) can effectively determine HER2 status in breast cancer, offering an alternative to immunohistochemistry (IHC) with FISH/CISH for predicting patient outcomes.
Area of Science:
- Oncology
- Molecular Biology
- Biomarker Discovery
Background:
- HER2 (Human Epidermal growth factor Receptor 2) is a key biomarker in breast cancer.
- Accurate HER2 status determination is crucial for treatment selection and prognosis.
- Current standard methods include immunohistochemistry (IHC) and in situ hybridization (FISH/CISH).
Purpose of the Study:
- To evaluate quantitative real-time PCR (Q-PCR) and RNA expression profiles (RNA-EPs) for HER2 status assessment.
- To compare the diagnostic accuracy and prognostic value of Q-PCR and RNA-EPs with conventional IHC/FISH/CISH methods.
- To explore alternative methods for HER2 analysis in breast cancer tissues.
Main Methods:
- Established cut-off levels for Q-PCR and RNA-EPs using IHC validated by FISH in 40 primary breast cancer samples.
- Validated Q-PCR and RNA-EPs in a separate set of 306 breast cancer tumors, comparing results with IHC validated by CISH.
- Analyzed relapse-free survival (RFS) and overall survival using 5 and 10-year follow-up data.
Main Results:
- Q-PCR and RNA-EPs demonstrated comparable sensitivity and specificity to IHC/FISH/CISH for HER2 determination.
- Both Q-PCR and RNA-EPs showed similar predictive values to IHC/FISH/CISH.
- Q-PCR and RNA-EPs provided statistically significant prognostic information for RFS and overall survival, outperforming IHC/CISH in long-term follow-up.
Conclusions:
- RNA-EPs and Q-PCR are viable alternative methods for analyzing HER2 status in breast cancer.
- These molecular techniques can be applied to both frozen and formalin-fixed samples.
- Q-PCR and RNA-EPs offer a potentially valuable alternative to IHC combined with FISH/CISH for HER2 assessment and outcome prediction.
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