Association of microRNA polymorphisms with the risk of head and neck squamous cell carcinoma in a Chinese population: a case–control study
- Limin Miao†1,
- Lihua Wang†2,
- Longbiao Zhu1,
- Jiangbo Du2,
- Xun Zhu2,
- Yuming Niu3,
- Ruixia Wang1,
- Zhibin Hu2, 4,
- Ning Chen1,
- Hongbing Shen2, 4Email author and
- Hongxia Ma2, 4Email author
© The Author(s) 2016
Received: 28 August 2015
Accepted: 4 March 2016
Published: 11 August 2016
MicroRNA (miRNA) polymorphisms may alter miRNA-related processes, and they likely contribute to cancer susceptibility. Various studies have investigated the associations between genetic variants in several key miRNAs and the risk of human cancers; however, few studies have focused on head and neck squamous cell carcinoma (HNSCC) risk. This study aimed to evaluate the associations between several key miRNA polymorphisms and HNSCC risk in a Chinese population.
In this study, we genotyped five common single-nucleotide polymorphisms (SNPs) in several key miRNAs (miR-149 rs2292832, miR-146a rs2910164, miR-605 rs2043556, miR-608 rs4919510, and miR-196a2 rs11614913) and evaluated the associations between these SNPs and HNSCC risk according to cancer site with a case–control study including 576 cases and 1552 controls, which were matched by age and sex in a Chinese population.
The results revealed that miR-605 rs2043556 [dominant model: adjusted odds ratio (OR) 0.71, 95% confidence interval (CI) 0.58–0.88; additive model: adjusted OR 0.74, 95% CI 0.62–0.89] and miR-196a2 rs11614913 (dominant model: adjusted OR 1.36, 95% CI 1.08–1.72; additive model: adjusted OR 1.28, 95% CI 1.10–1.48) were significantly associated with the risk of oral squamous cell carcinoma (OSCC). Furthermore, when these two loci were evaluated together based on the number of putative risk alleles (rs2043556 A and rs11614913 G), a significant locus-dosage effect was noted on the risk of OSCC (P trend < 0.001). However, no significant association was detected between the other three SNPs (miR-149 rs2292832, miR-146a rs2910164, and miR-608 rs4919510) and HNSCC risk.
Our study provided the evidence that miR-605 rs2043556 and miR-196a2 rs11614913 may have an impact on genetic susceptibility to OSCC in Chinese population.
KeywordsHead and neck cancer microRNA Polymorphism Squamous cell carcinoma Susceptibility
Head and neck cancer, predominantly head and neck squamous cell carcinoma (HNSCC), represents a common cancer worldwide and has been considered a serious and growing public health problem in many countries [1, 2]. It was estimated that 45,780 new patients would be diagnosed with cancer of the oral cavity and the pharynx, and 8650 deaths from these diseases occurred in 2015 in the United States alone . Environmental carcinogens and carcinogenic viruses have been identified as the main etiologic factors for HNSCC . Furthermore, genetic variants play a risk-modulating role in the etiology of HNSCC .
MicroRNAs (miRNAs) are 20–24 nt single-stranded RNA molecules that repress the expression of specific target genes by binding to the 3′-untranslated regions (UTRs) of messenger RNA (mRNA) . A single miRNA may regulate the expression of many genes, and it has been proposed that more than one-third of all protein-coding genes are under translational control by miRNAs . Numerous studies have demonstrated that aberrant expression of miRNAs is closely associated with the cell proliferation, invasion, metastasis, and prognosis of various cancers [8, 9]. Given that small variations in the expression of a specific miRNA may affect thousands of target mRNAs and result in diverse functional consequences , miRNAs have been considered ideal candidate genes for cancer predisposition.
Studies have demonstrated that potentially functional single nucleotide polymorphisms (SNPs) located in several key miRNAs may influence the function of mature miRNAs and then affect the process of carcinogenesis [11–13]. For example, rs2292832 in miR-149 and rs2043556 in miR-605 were associated with the modified expression level of these two miRNAs . rs2910164 in miR-146a altered the mature miR-146a expression level that was involved in the regulation of cell differentiation and cancer formation [15, 16]. rs4919510 in miR-608 has been predicted by in silico algorithms to exhibit differential capacities to bind to the potential target genes of miR-608, such as the insulin receptor (IR) and tumor protein 53 (TP53) . Furthermore, rs11614913 in miR-196a2 affects the expression of miR-196a, and aberrant regulation of miR-196a is involved in the development and progression of several cancers, including oral cancer . To date, some population studies and meta-analyses have been performed to investigate the associations between polymorphisms of the above important miRNAs and the risk of multiple types of malignant tumors [19, 20]. However, the results were inconsistent, and few studies focused on the associations of these SNPs with HNSCC risk in Chinese population.
Thus, we performed a case-control study on associations of five common SNPs in key miRNAs (rs2292832 in miR-149, rs2910164 in miR-146a, rs2043556 in miR-605, rs4919510 in miR-608, and rs11614913 in miR-196a2) with HNSCC risk in China.
This study is a hospital-based case–control study. All newly diagnosed HNSCC patients historically confirmed by two pathologists were consecutively recruited from Jiangsu Stomatological Hospital and the First Affiliated Hospital of Nanjing Medical University, Nanjing, China between January 2009 and May 2013. Exclusion criteria included secondary HNSCC or metastasized cancer from other organs. None of the patients received neoadjuvant chemotherapy or radiotherapy before surgery. Cancer-free controls matched to the cases by age (±5 years) and sex were randomly selected from a cohort of more than 30,000 participants in a community-based screening program for non-infectious diseases in the Jiangsu Province, China. All participants were genetically unrelated and of the ethnic Han Chinese population. Each participant was scheduled for a face-to-face interview to answer a structured questionnaire that elicited information on demographic characteristics and environmental exposure history, such as age, sex, smoking status, and drinking status. Written informed consent was obtained from each participant, and the study was approved by the Institutional Review Boards of all relevant institutes.
SNP selection and genotyping
Based on previous reports about miRNA polymorphisms and cancer risk [14–18], we chose five most investigated and potentially functional SNPs (rs2292832 in miR-149, rs2910164 in miR-146a, rs2043556 in miR-605, rs4919510 in miR-608, and rs11614913 in miR-196a2) for genotyping. Venous blood was collected from all subjects and centrifuged at a speed of 4000 round/min for 10 min. The centrifuged blood was stored at −40 °C for use. Genomic DNA was isolated from leukocyte pellets of venous blood by proteinase K digestion, and this process was followed by phenol chloroform extraction. All DNA samples were assessed for quality and quantity using Nanodrop (Thermo Scientific, Waltham, MA, USA) and DNA electrophoresis (agarose gel imaging system, agarose gel electronic balance, and electronic tank supplied by Oxoid company, Basingstoke, England; micropipette, microwave oven, and electrophoresis apparatus supplied by Gilson company, Madison, WI, USA) before genotyping. SNPs were genotyped by using Illumina Infinium1 Human Exome BeadChip (Illumina Inc., San Diego, CA, USA), and genotype calling was performed using the GenTrain version 1.0 clustering algorithm in GenomeStudio V2011.1 (Illumina). The overall call rate was 99.77%–99.91% for all SNPs.
The Hardy–Weinberg equilibrium was tested by a goodness-of-fit χ2 test to compare the observed genotype frequencies with the expected ones among the control subjects. Distributions of selected demographic variables, risk factors, and frequencies of variant genotypes between the cases and controls were evaluated by using the Pearson’s Chi squared test (uncorrected). The associations of variant genotypes with HNSCC risk were estimated by computing odds ratios (ORs) and 95% confidence intervals (CIs) from both univariate and multivariate logistic regression analyses according to cancer site. The heterogeneity between subgroups was assessed with the Chi square-based Q test. All statistical analyses were performed with Statistical Analysis System software (v.9.1 SAS Institute, Cary, NC, USA). P < 0.05 was considered as the level of statistical significance.
Additionally, we used another data-mining tool, the non-parametric multifactor dimensionality reduction (MDR) software (version 2.0 beta 8.4, Norris-Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA) to identify the potential locus–locus and gene-environment interactions with trichotomies genotypes, age (dichotomized into ≥60 years and <60 years), sex, smoking status, and drinking status. The fitness of the MDR model was assessed by estimating the testing accuracy and the cross-validation consistency (CVC). Models that were true positive would have estimating the testing accuracy of >0.5. The best model with the highest CVC and the highest testing accuracy was selected .
Selected characteristics of studied subjects
Selected characteristics of head and neck squamous cell carcinoma (HNSCC) patients and cancer-free controls
Patients [cases (%)]
Controls [cases (%)]
Primary information of selected SNPs
Primary information and minor allele frequencies (MAFs) of selected single-nuclide polymorphisms (SNPs)
Call rates (%)
MAF in controls
Associations between selected SNPs and HNSCC risk
Logistic regression analysis for associations between selected SNPs and HNSCC risk
Controls [number (%)]
Oral cancer patients [number (%)]
Adjusted OR (95% CI)b
Non-oral cancer patients [number (%)]
Adjusted OR (95% CI)b
Combined effects of the two significant SNPs on OSCC risk
Combined effects of miR-605 rs2043556 and miR-196a2 rs11614913 on oral squamous cell carcinoma (OSCC) risk
Number of risk allelesa
Patients [number (%)]
Controls [number (%)]
Adjust OR (95% CI)b
Stratification analysis for association between variant genotypes and OSCC risk
Stratification analysis for association between variant genotypes and OSCC risk
miR-605 rs2043556 genotype (GG/AG/AA)a
Adjusted OR (95% CI)b
miR-196a2 rs11614913 genotype (GG/AG/AA)a
Adjusted OR (95% CI)b
Combined effect (0-2/3-4 risk alleles)c
Adjusted OR (95% CI)b
Cancer patients (number)
Cancer patients (number)
Cancer patients (number)
MDR analysis for OSCC risk predication
Multifactor dimensionality reduction (MDR) analysis for OSCC risk predication
Training bal. acc.
Testing bal. acc.
Two-factor (age and miR-605 rs2043556)
Three-factor (age, miR-146a rs2910164, and miR-196a2 rs11614913)
Four-factor (age, miR-146a rs2910164, miR-608 rs4919510, and miR-196a2 rs11614913)
In this case–control study, we examined associations between five common SNPs in miRNAs (miR-149 rs2292832, miR-146a rs2910164, miR-605 rs2043556, miR-608 rs4919510, and miR-196a2 rs11614913) and HNSCC risk. The results revealed that rs2043556 in miR-605 and rs11614913 in miR-196a2 were significantly associated with OSCC risk in a Chinese population. However, no notable association was detected between other selected SNPs and HNSCC risk.
Once activated, the tumor suppressor p53 selectively modulates the expression of target genes involved in cell cycle arrest, apoptosis, and DNA repair . A recent study indicated that miR-605 was a new component in the p53 gene network . This network is transcriptionally activated by p53 and post-transcriptionally repressed by murine double minute 2 (Mdm2), which inhibits the function of p53. Thus, a positive feedback loop is created that aids in the rapid accumulation of p53 to facilitate its function in response to stress . Id Said et al.  reported that high expression of miR-605 could result in a significant reduction in cell viability, clonogenicity, and cell migration in TP53-mutant cell types and that rs2043556-variant G allele could significantly result in a decreased expression of miR-605. Several studies have investigated the associations between miR-605 rs2043556 and cancer risk, and a recent meta-analysis concluded that miR-605 rs2043556 was associated with a significant overall risk of human cancer . In this study, we first examined the effect of miR-605 rs2043556 on the risk of HNSCC and identified a significant linkage between this SNP and the decreased risk of OSCC in a Chinese population. Thus, we hypothesize that miR-605 rs2043556 may affect the expression of miR-605 and the risk of OSCC, which may provide a visual cue regarding the role of this SNP in the development of OSCC.
Rs11614913, which is located at miR-196a2, impacts the expression of miR-196a2 and is involved in the carcinogenesis of different types of cancer [17, 26, 27]. For example, Tian et al.  reported that miR-196a2 rs11614913 was associated with the increased risk of non-small cell lung cancer and poor patient survival, and Hu et al.  reported its association with the increased risk of breast cancer. It was also reported that miR-196a2 rs11614913 influenced mature miR-196a expression (but not the pre-miR-196a2 level) and affected the binding ability of miR-196a-3p to its targets . Additionally, Hoffman et al.  demonstrated that mature miR-196a2 level was increased 9.3-fold in breast cancer cells transfected with pre-miR-196a2-C (rs11614913), but the levels were only increased 4.4-fold in cells transfected with pre-miR-196a2-T. Such associations were then further supported by studies on other types of cancers. A recent meta-analysis revealed that miR-196a2 rs11614913 was associated with cancer risk, especially risks of lung, colorectal, and breast cancers among Asian populations . Specially, a few studies have investigated the association of rs11614913 in miR-196a2 with HNSCC risk in Caucasian populations, but the results were inconclusive. Liu et al.  found no association between miR-196a2 rs11614913 and risk of HNSCC, whereas Christensen et al.  reported that the miR-196a2 rs11614913 CC genotype was related with an increased HNSCC risk. Another study identified a significant association between rs11614913 and miR-196a2 expression levels in tumor tissues from OSCC patients, but no association of miR-196a2 rs11614913 with OSCC risk was noted . In this study, we demonstrated that the miR-196a2 rs11614913 G allele was significantly associated with an increased OSCC risk, which is consistent with the study by Christensen et al. . The difference between our study and the other two studies [32, 33] may due to different ethnic backgrounds and different composition of cases. The MAF in our controls was 0.432, whereas it was either 0.420  or not obtained  in the literature. Furthermore, the proportion of oral cancer was much higher in our study (80.2%) than that in the other two studies (29.4% and 55.6%, respectively). Larger studies with different ethnic backgrounds and functional investigation are needed to validate these findings.
Studies on associations between the other three SNPs (rs2292832 in miR-149, rs2910164 in miR-146a, and rs4919510 in miR-608) and cancer risk were inconsistent [34–38]. A recent meta-analysis of 12 studies, including 5937 cases and 6081 controls, revealed that miR-149 rs2292832 was not associated with cancer risk . Additionally, only two studies investigated the effect of miR-149 rs2292832 on HNSCC risk, and neither produced significant results [32, 40]. A meta-analysis of 66 case–control studies reported that miR-146a rs2910164 was a risk factor for HNSCC, which included four studies from a Caucasian population and one study from a Chinese population . However, the results from the Chinese population indicated that miR-146a rs2910164 was not significantly associated with oral cancer risk . To date, two studies have focused on the associations of miR-608 rs4919510 and cancer risk: one on colorectal cancer  and another on breast cancer , and their results were inconsistent. In our study, the results demonstrated that none of these three SNPs (rs2292832 in miR-149, rs2910164 in miR-146a, and rs4919510 in miR-608) contributed to the risk of HNSCC in a Chinese population. Given heterogeneous genetic backgrounds in different populations, these findings must be validated in further larger studies.
Several potential limitations of the present study warrant consideration. First, a relatively small sample size may limit the statistical power of our study, especially in the stratification analysis. We made multiple testing adjustments using the FDR method, and the results indicate that the associations between SNPs and OSCC risk remained significant. However, the effect of miR-605 rs2043556 on HNSCC risk was borderline significant after the FDR correction. Thus, our results must be confirmed in further studies. Second, our study is a hospital-based, case–control study, and inherent selection bias cannot be completely excluded. Third, the functional significance of rs2043556 in miR-605 and rs11614913 in miR-196a2 for the development of HNSCC remains largely unknown.
In summary, we identified that miR-605 rs2043556 and miR-196a2 rs11614913 were associated with OSCC risk in a Chinese population. Further replication studies with diverse ethnic groups and functional characterization are warranted to validate our findings.
This work was supported in part by Grants from the National Natural Science Foundation of China (Nos. 81473048 and 81302361), Priority Academic Program Development of Jiangsu Higher Education Institutions (Public Health and Preventive Medicine), Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20133234120013), China Postdoctoral Science Foundation (No. 2013M540457), and Jiangsu Planned Projects for Postdoctoral Research Funds (No. 1301018A).
The authors declare that they have no competing interests.
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- Marcu LG, Yeoh E. A review of risk factors and genetic alterations in head and neck carcinogenesis and implications for current and future approaches to treatment. J Cancer Res Clin Oncol. 2009;135:1303–14.View ArticlePubMedGoogle Scholar
- Torre LA, Bray F, Siegel RL, Ferlay J, Lortet-Tieulent J, Jemal A. Global cancer statistics, 2012. CA Cancer J Clin. 2015;65:87–108.View ArticlePubMedGoogle Scholar
- Siegel RL, Miller KD, Jemal A. Cancer statistics, 2015. CA Cancer J Clin. 2015;65:5–29.View ArticlePubMedGoogle Scholar
- Jemal A, Siegel R, Xu J, Ward E. Cancer statistics, 2010. CA Cancer J Clin. 2010;60:277–300.View ArticlePubMedGoogle Scholar
- da Silva SD, Ferlito A, Takes RP, Brakenhoff RH, Valentin MD, Woolgar JA, et al. Advances and applications of oral cancer basic research. Oral Oncol. 2011;47:783–91.View ArticlePubMedGoogle Scholar
- Chen PY, Meister G. microRNA-guided posttranscriptional gene regulation. Biol Chem. 2005;386:1205–18.View ArticlePubMedGoogle Scholar
- Carthew RW. Gene regulation by microRNAs. Curr Opin Genet Dev. 2006;16:203–8.View ArticlePubMedGoogle Scholar
- Wu C, Li M, Hu C, Duan H. Prognostic role of microRNA polymorphisms in patients with advanced esophageal squamous cell carcinoma receiving platinum-based chemotherapy. Cancer Chemother Pharmacol. 2014;73:335–41.View ArticlePubMedGoogle Scholar
- Yu H, Jiang L, Sun C, Guo L, Lin M, Huang J, et al. Decreased circulating miR-375: a potential biomarker for patients with non-small-cell lung cancer. Gene. 2013;24:01419–24.Google Scholar
- Paranjape T, Slack FJ, Weidhaas JB. microRNAs: tools for cancer diagnostics. Gut. 2009;58:1546–54.View ArticlePubMedPubMed CentralGoogle Scholar
- Loktionov A. Common gene polymorphisms, cancer progression and prognosis. Cancer Lett. 2004;208:1–33.View ArticlePubMedGoogle Scholar
- Duan R, Pak C, Jin P. Single nucleotide polymorphism associated with mature miR-125a alters the processing of pri-miRNA. Hum Mol Genet. 2007;16:1124–31.View ArticlePubMedGoogle Scholar
- Zeng Y, Cullen BR. Sequence requirements for micro RNA processing and function in human cells. RNA. 2003;9:112–23.View ArticlePubMedPubMed CentralGoogle Scholar
- Zhang MW, Jin MJ, Yu YX, Zhang SC, Liu B, Jiang X, et al. Associations of lifestyle-related factors, hsa-miR-149 and hsa-miR-605 gene polymorphisms with gastrointestinal cancer risk. Mol Carcinog. 2012;51(Suppl 1):E21–31.PubMedGoogle Scholar
- Jazdzewski K, Murray EL, Franssila K, Jarzab B, Schoenberg DR, de la Chapelle A. Common SNP in pre-miR-146a decreases mature miR expression and predisposes to papillary thyroid carcinoma. Proc Natl Acad Sci USA. 2008;105:7269–74.View ArticlePubMedPubMed CentralGoogle Scholar
- He H, Jazdzewski K, Li W, Liyanarachchi S, Nagy R, Volinia S, et al. The role of microRNA genes in papillary thyroid carcinoma. Proc Natl Acad Sci USA. 2005;102:19075–80.View ArticlePubMedPubMed CentralGoogle Scholar
- Dahiya N, Sherman-Baust CA, Wang TL, Davidson B, Shih Ie M, Zhang Y, et al. MicroRNA expression and identification of putative miRNA targets in ovarian cancer. PLoS One. 2008;3:e2436.View ArticlePubMedPubMed CentralGoogle Scholar
- Liu CJ, Tsai MM, Tu HF, Lui MT, Cheng HW, Lin SC. miR-196a overexpression and miR-196a2 gene polymorphism are prognostic predictors of oral carcinomas. Ann Surg Oncol. 2013;20(Suppl 3):S406–14.View ArticlePubMedGoogle Scholar
- Xu W, Xu J, Liu S, Chen B, Wang X, Li Y, et al. Effects of common polymorphisms rs11614913 in miR-196a2 and rs2910164 in miR-146a on cancer susceptibility: a meta-analysis. PLoS One. 2011;6:e20471.View ArticlePubMedPubMed CentralGoogle Scholar
- He B, Pan Y, Cho WC, Xu Y, Gu L, Nie Z, et al. The association between four genetic variants in microRNAs (rs11614913, rs2910164, rs3746444, rs2292832) and cancer risk: evidence from published studies. PLoS One. 2012;7:e49032.View ArticlePubMedPubMed CentralGoogle Scholar
- Ritchie MD, Hahn LW, Roodi N, Bailey LR, Dupont WD, Parl FF, et al. Multifactor-dimensionality reduction reveals high-order interactions among estrogen-metabolism genes in sporadic breast cancer. Am J Hum Genet. 2001;69:138–47.View ArticlePubMedPubMed CentralGoogle Scholar
- Vousden KH. Outcomes of p53 activation–spoilt for choice. J Cell Sci. 2006;119:5015–20.View ArticlePubMedGoogle Scholar
- Xiao J, Lin H, Luo X, Luo X, Wang Z. miR-605 joins p53 network to form a p53:miR-605:Mdm2 positive feedback loop in response to stress. EMBO J. 2011;30:5021.View ArticlePubMedPubMed CentralGoogle Scholar
- Id Said B, Malkin D. A functional variant in miR-605 modifies the age of onset in Li-Fraumeni syndrome. Cancer Genet. 2015;208:47–51.View ArticlePubMedGoogle Scholar
- Hu Y, Yu CY, Wang JL, Guan J, Chen HY, Fang JY. MicroRNA sequence polymorphisms and the risk of different types of cancer. Sci Rep. 2014;4:3648.PubMedGoogle Scholar
- Chen C, Zhang Y, Zhang L, Weakley SM, Yao Q. MicroRNA-196: critical roles and clinical applications in development and cancer. J Cell Mol Med. 2011;15:14–23.View ArticlePubMedPubMed CentralGoogle Scholar
- Hu Z, Chen J, Tian T, Zhou X, Gu H, Xu L, et al. Genetic variants of miRNA sequences and non-small cell lung cancer survival. J Clin Invest. 2008;118:2600–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Tian T, Shu Y, Chen J, Hu Z, Xu L, Jin G, et al. A functional genetic variant in microRNA-196a2 is associated with increased susceptibility of lung cancer in Chinese. Cancer Epidemiol Biomarkers Prev. 2009;18:1183–7.View ArticlePubMedGoogle Scholar
- Hu Z, Liang J, Wang Z, Tian T, Zhou X, Chen J, et al. Common genetic variants in pre-microRNAs were associated with increased risk of breast cancer in Chinese women. Hum Mutat. 2009;30:79–84.View ArticlePubMedGoogle Scholar
- Hoffman AE, Zheng T, Yi C, Leaderer D, Weidhaas J, Slack F, et al. MicroRNA miR-196a-2 and breast cancer: a genetic and epigenetic association study and functional analysis. Cancer Res. 2009;69:5970–7.View ArticlePubMedPubMed CentralGoogle Scholar
- Zhang H, Su YL, Yu H, Qian BY. Meta-analysis of the association between Mir-196a-2 polymorphism and cancer susceptibility. Cancer Biol Med. 2012;9:63–72.PubMedPubMed CentralGoogle Scholar
- Liu Z, Li G, Wei S, Niu J, El-Naggar AK, Sturgis EM, et al. Genetic variants in selected pre-microRNA genes and the risk of squamous cell carcinoma of the head and neck. Cancer. 2010;116:4753–60.View ArticlePubMedPubMed CentralGoogle Scholar
- Christensen BC, Avissar-Whiting M, Ouellet LG, Butler RA, Nelson HH, McClean MD, et al. Mature microRNA sequence polymorphism in MIR196A2 is associated with risk and prognosis of head and neck cancer. Clin Cancer Res. 2010;16:3713–20.View ArticlePubMedPubMed CentralGoogle Scholar
- Greenland S, O’Rourke K. On the bias produced by quality scores in meta-analysis, and a hierarchical view of proposed solutions. Biostatistics. 2001;2:463–71.View ArticlePubMedGoogle Scholar
- Linhares JJ, Azevedo M Jr, Siufi AA, de Carvalho CV, Wolgien Mdel C, Noronha EC, et al. Evaluation of single nucleotide polymorphisms in microRNAs (hsa-miR-196a2 rs11614913 C/T) from Brazilian women with breast cancer. BMC Med Genet. 2012;13:119.View ArticlePubMedPubMed CentralGoogle Scholar
- Lian H, Wang L, Zhang J. Increased risk of breast cancer associated with CC genotype of Has-miR-146a Rs2910164 polymorphism in Europeans. PLoS One. 2012;7:e31615.View ArticlePubMedPubMed CentralGoogle Scholar
- Huang AJ, Yu KD, Li J, Fan L, Shao ZM. Polymorphism rs4919510:C > G in mature sequence of human microRNA-608 contributes to the risk of HER2-positive breast cancer but not other subtypes. PLoS One. 2012;7:e35252.View ArticlePubMedPubMed CentralGoogle Scholar
- Ryan BM, McClary AC, Valeri N, Robinson D, Paone A, Bowman ED, et al. rs4919510 in hsa-mir-608 is associated with outcome but not risk of colorectal cancer. PLoS One. 2012;7:e36306.View ArticlePubMedPubMed CentralGoogle Scholar
- Xu L, Zhou X, Qiu MT, Yin R, Wu YQ, Xu L. Lack of association between hsa-miR-149 rs2292832 polymorphism and cancer risk: a meta-analysis of 12 studies. PLoS One. 2013;8:e73762.View ArticlePubMedPubMed CentralGoogle Scholar
- Chu YH, Tzeng SL, Lin CW, Chien MH, Chen MK, Yang SF. Impacts of microRNA gene polymorphisms on the susceptibility of environmental factors leading to carcinogenesis in oral cancer. PLoS One. 2012;7:e39777.View ArticlePubMedPubMed CentralGoogle Scholar
- Ma XP, Zhang T, Peng B, Yu L, de Jiang K. Association between microRNA polymorphisms and cancer risk based on the findings of 66 case–control studies. PLoS One. 2013;8:e79584.View ArticlePubMedPubMed CentralGoogle Scholar