Latent Association Between Diets and Glioma Risk: A Mendelian Randomization Analysis

Area of Science:

• Nutritional epidemiology
• Cancer research
• Genetic epidemiology

Background:

• Gliomas, especially glioblastoma, have poor prognoses.
• Dietary factors are suspected to influence glioma risk, but observational studies face confounding.
• Mendelian randomization is used to investigate causal links between diet and glioma.

Purpose of the Study:

• To investigate the causal relationship between various dietary factors and glioma risk.
• To differentiate risk for glioblastoma (GBM) and non-GBM gliomas.

Main Methods:

• A two-sample Mendelian randomization (MR) framework was employed.
• Genome-wide association study data for 22 dietary exposures and glioma risk were analyzed.
• Inverse-variance weighted regression, MR-Egger, and MR-PRESSO were used for causal inference and pleiotropy assessment.

Main Results:

• Cooked vegetable intake showed a positive causal association with glioblastoma risk (OR = 6.55).
• Alcohol intake was protective for non-GBM glioma risk (OR = 0.770).
• Beer consumption was linked to increased non-GBM glioma risk (OR = 4.82); other factors were not significant.

Conclusions:

• Cooked vegetable intake, beer consumption, and alcohol intake may causally influence glioma risk.
• Findings suggest specific dietary components as potential modifiable risk factors.
• Further research is needed to explore dietary determinants for glioma prevention.