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KMID : 0381120230450020203
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Genes and Genomics
2023 Volume.45 No. 2 p.203 ~ p.213
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Causal relationship between smoking status, smoking frequency and bladder cancer: a Mendelian randomization study
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Lei Pang
Zijun Ding
Hongqiang Chai
Fei Li
Ming Wu
Weibing Shuang
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Abstract
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Background : Smoking is a well-established risk factor for bladder cancer. However, it remained unclear that whether smoke status and smoke frequency increase bladder cancer.
Objective : We aim to explore the causal relationship between smoking status, smoking frequency and the risk of bladder cancer by Mendelian randomization.
Methods : Large sample size of the genome-wide association(GWAS) database of smoking status, smoking frequency and bladder cancer were obtained. Smoking status included never, previous and current whereas smoking frequency included cigarettes smoked per day, number of cigarettes currently smoked daily and pack years of smoking. Six sets of instrumental variables and 78 related single nucleotide polymorphic(SNP) loci were identified (P?
Results : There is no causal effect from smoke status on bladder cancer risk while significantly positive relationship between smoking frequency on bladder cancer risk were found. IVW results showed that cigarettes smoked per day, number of cigarettes currently smoked daily and pack years of smoking increase bladder cancer (OR 1.001, 95% CI 1.000?1.002, P?=?0.047; OR 1.003, 95% CI 1.000?1.005, P?=?0.028; OR 1.004, 95% CI 1.001?1.006, P?=?0.003). Sensitivity analysis showed that genetic pleiotropy did not bias the results.
Conclusion
The results of two sample Mendelian randomization analysis show that there is a positive causal relationship between smoking frequency and the risk of bladder cancer.
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KEYWORD
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Smoking status, Smoking frequency, bladder cancer, Mendelian randomization, Causal relationship
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