Replication study for reported SNP associations with breast cancer survival
Alicia Beeghly-Fadiel1, Wei Zheng, Wei Lu
1Division of Epidemiology, Department of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN 37203, USA.
Journal of Cancer Research and Clinical Oncology
|February 28, 2012
Summary
Genetic variations in matrix metalloproteinase genes (MMP7 and MMP8) are linked to improved breast cancer survival. This study confirms that specific single nucleotide polymorphisms (SNPs) can predict overall survival and disease-free survival outcomes.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Single nucleotide polymorphisms (SNPs) are common genetic variations.
- Matrix metalloproteinases (MMPs) play roles in tumor progression and metastasis.
- Understanding genetic factors influencing breast cancer survival is crucial for personalized medicine.
Purpose of the Study:
- To validate previously identified SNP-breast cancer outcome associations.
- To evaluate the impact of specific SNPs on disease-free survival (DFS) and overall survival (OS) in a large cohort.
- To investigate the prognostic value of genetic variants in matrix metalloproteinase genes.
Main Methods:
- A two-stage survival study involving 5,192 breast cancer patients.
- Proportional hazards regression analysis to calculate hazard ratios (HR) and 95% confidence intervals (CI).
- Adjusted models included age, disease stage, hormone receptor status, and treatment regimens.
Main Results:
- Two SNPs, one in MMP7 (rs11225297) and one in MMP8 (rs11225395), showed significant associations with OS.
- TT genotypes for MMP7 rs11225297 were associated with a 60% reduced risk of mortality (HR: 0.4).
- TT genotypes for MMP8 rs11225395 were associated with a 40% reduced risk of mortality (HR: 0.6).
- Joint analysis revealed significant dose-response relationships for both OS and DFS with increasing rare alleles.
Conclusions:
- Specific SNPs in MMP7 and MMP8 are significantly associated with breast cancer survival in Chinese women.
- These findings support the hypothesis that genetic variants in MMP genes influence breast cancer prognosis.
- Further research into SNPs in genes involved in metastasis, angiogenesis, and tumor microenvironment regulation is warranted.
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