Investigation of Causal Effect of Type 2 Diabetes Mellitus on Lung Cancer: A Mendelian Randomization Study

Frontiers in Genetics

Xiaoyu Zhao¹  Tongtong Hong¹  Cheng Wang²  Hongxia Ma²  Juncheng Dai²  Na Qin²  Yue Jiang² 

[1] Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China;Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China;

关键词: lung cancer;    type 2 diabetes mellitus;    Mendelian randomization;    genome-wide association study;    causation;   

DOI  :  10.3389/fgene.2021.673687

来源: DOAJ

【 摘 要 】

BackgroundAlthough several observational studies have attempted to investigate the association between type 2 diabetes mellitus (T2DM) and lung cancer risk, the results are controversial. Here, we intend to examine whether there is a causal association between T2DM and lung cancer risk.Materials and MethodsWe conducted a Mendelian randomization (MR) study to systematically investigate the effect of T2DM on lung cancer among 13,327 cases and 13,328 controls. A weighted genetic risk score (wGRS) was constructed as a proxy instrument by using 82 previously reported T2DM-related single nucleotide polymorphisms (SNPs). The logistic regression model was utilized to estimate associations of T2DM-related SNPs and wGRS with lung cancer risk. Sensitivity analyses were also performed to assess the robustness of the observed associations.ResultsWe found no evidence for a causal relationship between T2DM and lung cancer risk (odds ratio, OR = 0.96, 95% confidence interval: 0.91–1.01, p = 0.96), and the association did not vary among populations of different age, sex, smoking status, and histological type. Sensitivity analyses (e.g., MR-Egger test) suggest that pleiotropic effects did not bias the result.ConclusionIn this MR study with a large number of lung cancer cases, we found no evidence to support the causal role of T2DM in lung cancer risk. Further large-scale prospective studies are warranted to replicate our findings.

【 授权许可】

Unknown