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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.
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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