Abstract
Recent compelling evidence indicates that mutation, aberrant expression, and dysregulation of microRNA (miRNA) biogenesis are implicated in cancer development and progression. Based on the important role of miRNA biogenesis pathway in carcinogenesis, we hypothesized that genetic variations in this pathway genes may play a role as susceptibility factors for breast cancer. To test this hypothesis, we investigated the associations between 41 single nucleotide polymorphisms (SNPs) in 14 genes involved in miRNA biogenesis pathway and breast cancer risk in a case–control study of 559 Korean breast cancer cases and 567 controls frequency-matched by age. In all women, 3 SNPs (AGO1 rs595055, AGO2 rs3864659, and p68 rs1991401) were significantly associated with breast cancer risk. In stratified analysis by menopausal status, altered risk associations were observed for 7 SNPs in postmenopausal breast cancer. When subjects were grouped by the number of high-risk genotypes, we found a progressive increase in gene-dosage effect (P trend = 9.46E−7). The protective effects of AGO2 rs3864659 and HIWI rs11060845 were more pronounced in progesterone receptor-positive (PR+) cancer than in progesterone receptor-negative (PR−) cancer (odds ratio (OR), 0.50; 95% confidence interval (CI), 0.30–0.84 vs. OR, 0.94; 95% CI, 0.60–1.84; P heterogeneity = 0.04 and OR, 0.57; 95% CI, 0.37–0.88 vs. OR, 0.97; 95% CI, 0.65–1.44; P heterogeneity = 0.02, respectively), and the DROSHA rs644236 had stronger association with estrogen receptor-negative (ER−) cancer than for estrogen receptor-positive (ER+) cancer (OR, 1.39; 95% CI, 1.08–1.78 vs. OR, 1.05; 95% CI, 0.85–1.29; P heterogeneity = 0.04). Our results suggest that genetic variants in miRNA biogenesis pathway genes may be associated with breast cancer risk, and the modifiable effects might be different according to the menopausal status and hormone receptor status.
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Abbreviations
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- ER+:
-
Estrogen receptor-positive
- ER−:
-
Estrogen receptor-negative
- GWAS:
-
Genome-wide association study
- HWE:
-
Hardy–Weinberg equilibrium
- LD:
-
Linkage disequilibrium
- MAF:
-
Minor allele frequency
- miRNA:
-
MicroRNA
- OR:
-
Odds ratio
- PR+:
-
Progesterone receptor-positive
- PR−:
-
Progesterone receptor-negative
- SNP:
-
Single nucleotide polymorphism
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This research was supported by Basic Research Laboratory (BRL) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0001200).
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Supplementary Table 1
The distributions of selected haplotypes in miRNA biogenesis pathway genes and breast cancer risks in postmenopausal women. (DOC 54 kb)
Supplementary Table for Editor
Tagging efficiency: the proportion of common variants tagged by the tagSNPs in selected genes (DOCX 27 kb)
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Sung, H., Lee, KM., Choi, JY. et al. Common genetic polymorphisms of microRNA biogenesis pathway genes and risk of breast cancer: a case–control study in Korea. Breast Cancer Res Treat 130, 939–951 (2011). https://doi.org/10.1007/s10549-011-1656-2
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DOI: https://doi.org/10.1007/s10549-011-1656-2