Searching for causal relationships of glioma: a phenome-wide Mendelian randomisation study.

Journal Article (Journal Article)

BACKGROUND: The aetiology of glioma is poorly understood. Summary data from genome-wide association studies (GWAS) can be used in a Mendelian randomisation (MR) phenome-wide association study (PheWAS) to search for glioma risk factors. METHODS: We performed an MR-PheWAS analysing 316 phenotypes, proxied by 8387 genetic variants, and summary genetic data from a GWAS of 12,488 glioma cases and 18,169 controls. Causal effects were estimated under a random-effects inverse-variance-weighted (IVW-RE) model, with robust adjusted profile score (MR-RAPS), weighted median and mode-based estimates computed to assess the robustness of findings. Odds ratios per one standard deviation increase in each phenotype were calculated for all glioma, glioblastoma (GBM) and non-GBM tumours. RESULTS: No significant associations (P < 1.58 × 10-4) were observed between phenotypes and glioma under the IVW-RE model. Suggestive associations (1.58 × 10-4 < P < 0.05) were observed between leukocyte telomere length (LTL) with all glioma (ORSD = 3.91, P = 9.24 × 10-3) and GBM (ORSD = 4.86, P = 3.23 × 10-2), but the association was primarily driven by the TERT variant rs2736100. Serum low-density lipoprotein cholesterol and plasma HbA1C showed suggestive associations with glioma (ORSD = 1.11, P = 1.39 × 10-2 and ORSD = 1.28, P = 1.73 × 10-2, respectively), both associations being reliant on single genetic variants. CONCLUSIONS: Our study provides further insight into the aetiological basis of glioma for which published data have been mixed.

Full Text

Duke Authors

Cited Authors

  • Saunders, CN; Cornish, AJ; Kinnersley, B; Law, PJ; Houlston, RS; Collaborators,

Published Date

  • January 2021

Published In

Volume / Issue

  • 124 / 2

Start / End Page

  • 447 - 454

PubMed ID

  • 33020596

Pubmed Central ID

  • PMC7852872

Electronic International Standard Serial Number (EISSN)

  • 1532-1827

Digital Object Identifier (DOI)

  • 10.1038/s41416-020-01083-1


  • eng

Conference Location

  • England