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Updated: Feb 19, 2026
Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
Published on: February 17, 2011
BRCA1 and BRCA2 expression patterns and prognostic significance in digestive system cancers
Gui-Hua Wang1, Chun-Mei Zhao1, Ying Huang1
1Department of Laboratory Medicine, Department of Tissue Bank, Affiliated Hospital of Nantong University, School of Public Health, Nantong University, Nantong, Jiangsu, PR China, 226001.
Abstract:
The role of BRCA1 and BRCA2 genes is mainly to maintain genome integrity in response to DNA damage through different mechanisms. Deregulation of BRCA1 and BRCA2 is associated with the development of tumor and altered sensitivity to chemotherapeutic agents. In this study, we determined protein expression of BRCA1 and BRCA2 in 4 digestive system cancers (gastric cancer, colorectal cancer, hepatocellular carcinoma, and pancreatic cancer) by immunohistochemistry on tissue microarrays. A total of 1546 samples of 4 types of cancer tissues, their matched adjacent nontumor tissues, and corresponding benign tissues were studied, respectively. Immunohistochemistry expression patterns of the 2 proteins and their correlation with patients' clinical parameters and overall survival were analyzed. The results showed that low expression of cytoplasmic BRCA1 and BRCA2 was commonly associated with advanced tumor-lymph node-metastasis stage, whereas high expression of nuclear BRCA1 was generally correlated with advanced tumor stages in these cancers. High expression of cytoplasmic BRCA1 and BRCA2 had significantly favorable overall survival in digestive system cancers; in contrast, BRCA1 nuclear expression usually predicted poor outcomes. We conclude that BRCA1 and BRCA2 could be used as clinicopathological biomarkers to evaluate the prognosis of digestive system cancers.
Insights
BRCA1 and BRCA2 protein expression in digestive cancers impacts patient survival. High cytoplasmic expression of these genes indicates a favorable prognosis, while high nuclear BRCA1 expression suggests a poor outcome.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- BRCA1 and BRCA2 genes are crucial for maintaining genome integrity.
- Their deregulation is linked to tumor development and chemotherapy resistance.
Purpose of the Study:
- To investigate BRCA1 and BRCA2 protein expression in four digestive system cancers.
- To correlate expression patterns with clinical parameters and patient survival.
Main Methods:
- Immunohistochemistry on tissue microarrays.
- Analysis of 1546 samples from gastric, colorectal, hepatocellular, and pancreatic cancers.
- Correlation analysis with clinical data and overall survival.
Main Results:
- Low cytoplasmic BRCA1/BRCA2 expression correlated with advanced tumor-lymph node-metastasis stage.
- High nuclear BRCA1 expression correlated with advanced tumor stages.
- High cytoplasmic BRCA1/BRCA2 expression predicted favorable overall survival; nuclear BRCA1 predicted poor outcomes.
Conclusions:
- BRCA1 and BRCA2 protein expression levels are associated with patient prognosis in digestive cancers.
- Cytoplasmic and nuclear expression patterns offer distinct prognostic information.
- BRCA1 and BRCA2 can serve as potential clinicopathological biomarkers for digestive system cancer prognosis.
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