Introduction: Although normal epithelial cells do not show human epidermal growth factor receptor-2 (HER2) gene amplification and should lack membrane staining by HER2 immunohistochemistry (IHC), HER2 staining in benign breast epithelium is occasionally encountered. The significance of this occurrence has not yet been adequately studied, and its associated American Society of Clinical Oncology/College of American Pathologists recommendations are vague. Our objective is to assess the correlation between HER2 IHC 3+ breast cancer cases with normal epithelium staining (NES) and their corresponding fluorescence in situ hybridization (FISH) results, and to suggest recommendations for interpretation.
Materials And Methods: A total of 154 breast cancer cases with HER2 IHC 3+ were reviewed. NES, along with other clinicopathologic characteristics, were recorded. NES was scored as present or absent. All study cases were sent for FISH testing. All cases, and particularly those that showed false positivity for IHC (positive IHC, negative FISH) were examined for NES.
Results: Of the 154 cases, 146 cases were FISH-positive (94.8%) and 2 failed FISH testing (1.3%). Conversely, 22% (34/154) of the cases showed NES for HER2. Of these 34 cases, 23 (67%) were FISH-amplified, 9 (26%) were FISH not amplified, and 2 failed FISH testing. Notably, all of the false-positive (FISH-negative) breast cancer cases showed some degree of positivity in normal breast epithelium.
Conclusions: Our findings, though descriptive, show a very strong association between NES and false-positive HER2 IHC. This confirms the need to carefully evaluate IHC-positive breast cancers for NES, and to have a low threshold for confirmatory testing by FISH.
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http://dx.doi.org/10.1016/j.clbc.2019.04.017 | DOI Listing |
Prog Biophys Mol Biol
December 2024
Zhangjiagang Hospital of Traditional Chinese Medicine Affiliated to Nanjing University of Chinese Medicine, Suzhou City, Jiangsu, 215600, China. Electronic address:
N-methyladenosine (mA) modification is the most common epitranscriptomic modification in eukaryotic RNA and has garnered extensive attention in the context of breast cancer research. The mA modification significantly impacts tumorigenesis and tumor progression by regulating RNA stability, splicing, translation, and degradation. In this review we summarize recent advances in understanding the roles of mA modification in the mechanisms underlying angiogenesis and vasculogenic mimicry in breast cancer.
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December 2024
Division of Breast Surgery, Department of Surgery, Linkou Chang Gung Memorial Hospital, Taoyüan, Taiwan, R.O.C..
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Biol Res
December 2024
Unidad de Innovación en Prevención y Oncología de Precisión Centro Oncológico, Facultad de Medicina, Unidad de Innovación en Prevención y Oncología de Precisión Universidad Católica del Maule, Talca, 3480094, Chile.
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View Article and Find Full Text PDFMed Mol Morphol
December 2024
Department of Pathology, Kurume University School of Medicine, Kurume, Japan.
We report a case of solid papillary carcinoma (SPC) that developed at the site of a previous intraductal papilloma (IDP) with atypical ductal hyperplasia. This case supports IDP as a potential precursor lesion to SPC.
View Article and Find Full Text PDFEur J Med Res
December 2024
Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Shandong University, Jinan, 250021, Shandong, China.
The gut microbiota is a complex and dynamic ecosystem that plays a crucial role in human health and disease, including obesity, diabetes, cardiovascular diseases, neurodegenerative diseases, inflammatory bowel disease, and cancer. Chronic inflammation is a common feature of these diseases and is closely related to angiogenesis (the process of forming new blood vessels), which is often dysregulated in pathological conditions. Inflammation potentially acts as a central mediator.
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