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Updated: May 10, 2026
11:12
Optimization of a Multiplex RNA-based Expression Assay Using Breast Cancer Archival Material
Published on: August 1, 2018
Change in HER2 status during breast tumor progression
1Department of Breast and Endocrine Surgery, Tokai University School of Medicine, Kanagawa, Japan.
Cancer Biomarkers : Section a of Disease Markers
|June 6, 2013
Summary
HER2 status in breast cancer can change between primary and metastatic tumors, impacting treatment. Accurate HER2 testing requires careful pathology analysis to ensure reliable results for effective breast cancer management.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- HER2 status is crucial for breast cancer diagnosis and treatment selection.
- Standardized testing involves immunohistochemistry and FISH analysis.
- Potential HER2 status discordance between primary and metastatic sites is a growing concern.
Purpose of the Study:
- To review the clinical significance of HER2 discordance in breast cancer.
- To highlight the impact of pathological analysis on HER2 assessment.
- To emphasize the importance of tumor sample handling in determining HER2 positivity.
Main Methods:
- Review of existing literature on HER2 testing in breast cancer.
- Discussion of factors influencing HER2 assessment, including tumor sampling and fixation.
- Analysis of immunohistochemical and FISH methodologies.
Main Results:
- HER2 status can differ between primary and metastatic breast cancer lesions.
- Trastuzumab treatment may be associated with HER2 status conversion.
- Pathological factors significantly affect the accuracy of HER2 testing.
Conclusions:
- HER2 discordance has significant clinical implications for breast cancer patients.
- Standardized and meticulous pathological analysis is essential for accurate HER2 assessment.
- Proper tumor sample handling is critical for reliable HER2 positivity determination.
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