Abstract
Background
A growing body of evidence indicates that oxidative stress, high levels of reactive oxygen species (ROS), is implicated in the pathogenesis of breast cancer (BC). Superoxide dismutase (SOD2), a mitochondria-resident antioxidant enzyme, protects cells from ROS by catalytically converting the superoxide radicals into less reactive species.
Objective
We aimed to investigate whether SOD2 rs2758339, rs5746136 and rs2842980 polymorphisms are associated with increased risk of BC.
Methods
A total of 100 patients with BC and 100 healthy controls were enrolled in the study. We used polymerase chain reaction-restriction fragment length polymorphism (PCR–RFLP) assay for genotyping the SOD2 single-nucleotide polymorphisms (SNPs). Under co-dominant, dominant and recessive inheritance models, the genotypic and allelic associations of SOD2 SNPs with susceptibility to BC were evaluated using logistic regression analysis. The haplotype analysis was performed on the SOD2 SNPs to determine their combined effect on the BC risk.
Results
We found that SOD2 rs5746136 was significantly associated with decreased risk of developing BC in co-dominant and dominant inheritance models (P < 0.05). The SOD2 rs5746136 T allele confers an apparent protective effect against breast carcinogenesis (OR: 1.956; 95% CI 1.312–2.916; P < 0.0001). The SOD2 rs5746136/rs2842980 combined genotypes (CT/AA, CT/AT and TT/AA) were significantly more frequent in healthy subjects compared to BC patients (P < 0.05). The CTA and ACA haplotypes (rs2758339, rs5746136, rs2842980) were found to be a protective and a risk factor for BC, respectively.
Conclusion
These data strongly suggest that SOD2 rs5746136 was significantly associated with reduced risk of BC, indicating its protective role in BC development.
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Data availability
The author confirm that the data supporting the findings of this study are available within the article.
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Authors would like to express their sincerest appreciation to all subjects for participating in this study.
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Sara Asadi, Morteza Abkar, Zahra Zamanzadeh, Setareh Taghipour Kamalabad, Maryam Sedghi, and Saghar Yousefnia declare that they have no conflict of interest.
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The study protocol was approved the Institutional Review Board /Independent Ethics Committee (IRB/IEC) of the Shahid Ashrafi Esfahani University, Isfahan, Iran.
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Asadi, S., Abkar, M., Zamanzadeh, Z. et al. Association of SOD2 rs2758339, rs5746136 and rs2842980 polymorphisms with increased risk of breast cancer: a haplotype-based case–control study. Genes Genom 45, 1165–1178 (2023). https://doi.org/10.1007/s13258-023-01399-1
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DOI: https://doi.org/10.1007/s13258-023-01399-1