Educational attainment and endometrial cancer: A Mendelian randomization study

Qixia Wang; Runchen Wang; Chao Chen; Yi Feng; Zhiming Ye; Miaorong Zhan; Hao Wen; Kaimin Guo

doi:10.3389/fgene.2022.993731

Educational attainment and endometrial cancer: A Mendelian randomization study

Front Genet. 2022 Nov 29:13:993731. doi: 10.3389/fgene.2022.993731. eCollection 2022.

Authors

Qixia Wang^{1

2}, Runchen Wang^{1

2}, Chao Chen^{1

2}, Yi Feng^{1

2}, Zhiming Ye^{1

2}, Miaorong Zhan^{1

3}, Hao Wen^{1

4}, Kaimin Guo¹

Affiliations

¹ Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.
² Nanshan School, Guangzhou Medical University, Guangzhou, China.
³ Third Clinical School, Guangzhou Medical University, Guangzhou, China.
⁴ First Clinical School, Guangzhou Medical University, Guangzhou, China.

Abstract

Background: Low educational attainment has been reported as a risk factor for many diseases. However, conclusion on the association between educational attainment and endometrial cancer (EC) are inconsistent in previous observational studies. This study aims to explore the potential causal association between educational attainment and EC. Methods: A Mendelian Randomization analysis was performed using publicly summary-level data sets of genome-wide association studies (GWAS). A total of 306 single-nucleotide polymorphisms (SNPs) were extracted as instrumental variables for the exposure of educational attainment from the Social Science Genetic Association Consortium GWAS summary data of 1,131,881 participants of European ancestry. SNPs of EC were obtained from the Endometrial Cancer Association Consortium, the Epidemiology of Endometrial Cancer Consortium and the UK Biobank involving 121,885 people. We conducted inverse variance weighted (IVW) to estimate the causal effect as our primary outcome. And we perform several sensitivity analyses, including MR-Egger regression, weighted median method, MR-PRESSO (Mendelian Randomization Pleiotropy Residual Sum and Outlier) global test, and leave-one-out sensitivity analysis, to evaluate the effect of pleiotropism on the causal estimates. Results: Genetic predisposition towards 4.2 years of additional educational attainment was associated with 38% lower risk of EC. (odds ratio 0.72, 95% confidence interval 0.62 to 0.83; p = 1.65*10^-5). The consistent results of sensitivity analyses indicated our causal estimates were reliable. Genetic predisposition towards longer educational attainment was associated with lower risk of obesity, high waist-to-hip ratio (WHR), and diabetes. Conclusion: This study indicated that low educational attainment was a causal risk factor for EC, especially for EC with endometrioid histology. Low educational attainment might lead to EC through the mediator of obesity, high WHR, and diabetes.

Keywords: Mendelian randomization (MR); causal inference; educational attainment; endometrial cancer (EC); risk factor.

Abstract

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