Increased EGFR and Decreased BRCA1 in Japanese Triple-Negative Breast Cancers
Author Information
Author(s): Toyama Tatsuya, Yamashita Hiroko, Kondo Naoto, Okuda Katsuhiro, Takahashi Satoru, Sasaki Hidefumi, Sugiura Hiroshi, Iwase Hirotaka, Fujii Yoshitaka
Primary Institution: Nagoya City University Graduate School of Medical Sciences
Hypothesis
Are EGFR copy numbers increased and BRCA1 mRNA expression decreased in Japanese triple-negative breast cancers?
Conclusion
Triple-negative breast cancers have an aggressive clinical course, and EGFR and BRCA1 might be candidate therapeutic targets in this disease.
Supporting Evidence
- 11.3% of patients had triple-negative breast cancers.
- 21% of triple-negative breast cancers showed increased EGFR gene copy numbers.
- BRCA1 mRNA expression was significantly lower in triple-negative breast cancers compared to controls.
- Triple-negative status was associated with grade 3 tumors and high Ki67 expression.
Takeaway
This study looked at breast cancer in Japanese patients and found that a type called triple-negative breast cancer often has more copies of a gene called EGFR and less of another gene called BRCA1, which could help doctors find new treatments.
Methodology
The study analyzed 969 patients diagnosed with invasive breast cancer, focusing on immunohistochemical data and gene expression using TaqMan PCR assays.
Potential Biases
Potential biases may arise from the retrospective nature of the study and the selection of patients from a single institution.
Limitations
The study did not analyze BRCA1 gene mutations and relied on historical data from patients treated over a long period.
Participant Demographics
The study involved 969 Japanese patients diagnosed with invasive breast cancer.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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