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The Capital Region of Denmark - a part of Copenhagen University Hospital
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Lack of association between modifiable exposures and glioma risk: a Mendelian randomization analysis

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  • Charlie N Saunders
  • Alex J Cornish
  • Ben Kinnersley
  • Philip J Law
  • Elizabeth B Claus
  • Dora Il'yasova
  • Joellen Schildkraut
  • Jill S Barnholtz-Sloan
  • Sara H Olson
  • Jonine L Bernstein
  • Rose K Lai
  • Stephen Chanock
  • Preetha Rajaraman
  • Christoffer Johansen
  • Robert B Jenkins
  • Beatrice S Melin
  • Margaret R Wrensch
  • Marc Sanson
  • Melissa L Bondy
  • Richard S Houlston
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BACKGROUND: The etiological basis of glioma is poorly understood. We have used genetic markers in a Mendelian randomization (MR) framework to examine if lifestyle, cardiometabolic, and inflammatory factors influence the risk of glioma. This methodology reduces bias from confounding and is not affected by reverse causation.

METHODS: We identified genetic instruments for 37 potentially modifiable risk factors and evaluated their association with glioma risk using data from a genome-wide association study of 12 488 glioma patients and 18 169 controls. We used the estimated odds ratio of glioma associated with each of the genetically defined traits to infer evidence for a causal relationship with the following exposures:Lifestyle and dietary factors-height, plasma insulin-like growth factor 1, blood carnitine, blood methionine, blood selenium, blood zinc, circulating adiponectin, circulating carotenoids, iron status, serum calcium, vitamins (A1, B12, B6, E, and 25-hydroxyvitamin D), fatty acid levels (monounsaturated, omega-3, and omega-6) and circulating fetuin-A;Cardiometabolic factors-birth weight, high density lipoprotein cholesterol, low density lipoprotein cholesterol, total cholesterol, total triglycerides, basal metabolic rate, body fat percentage, body mass index, fasting glucose, fasting proinsulin, glycated hemoglobin levels, diastolic and systolic blood pressure, waist circumference, waist-to-hip ratio; andInflammatory factors- C-reactive protein, plasma interleukin-6 receptor subunit alpha and serum immunoglobulin E.

RESULTS: After correction for the testing of multiple potential risk factors and excluding associations driven by one single nucleotide polymorphism, no significant association with glioma risk was observed (ie, PCorrected > 0.05).

CONCLUSIONS: This study did not provide evidence supporting any of the 37 factors examined as having a significant influence on glioma risk.

Original languageEnglish
JournalNeuro-Oncology
Volume22
Issue number2
Pages (from-to)207-215
Number of pages9
ISSN1522-8517
DOIs
Publication statusPublished - 20 Feb 2020

    Research areas

  • Brain Neoplasms, Diet/adverse effects, Glioma, Humans, Inflammation/complications, Life Style, Mendelian Randomization Analysis, Metabolism/genetics, Risk Factors

ID: 64232325