Causality between ischemic stroke and glioblastoma: Bidirectional Mendelian randomization analysis.

Area of Science:

• Neuroscience
• Oncology
• Genetics

Background:

• Glioblastoma (GBM) and ischemic stroke (IS) are significant global health concerns.
• The potential association between IS and GBM risk is a subject of ongoing scientific debate.
• Understanding any causal relationship is crucial for public health strategies and patient care.

Purpose of the Study:

• To investigate the potential causal relationship between genetically predicted ischemic stroke (IS) and glioblastoma (GBM).
• To utilize Mendelian randomization to assess if IS influences GBM risk.
• To provide robust evidence regarding the IS-GBM association in European populations.

Main Methods:

• Mendelian randomization analysis using genome-wide association study data for IS and GBM.
• Inverse variance weighted method for primary analysis.
• Cochran's Q-test, Mendelian randomization-Egger regression, and leave-one-out analysis to assess heterogeneity and pleiotropy.

Main Results:

• No statistically significant causal link was found between genetically predicted IS and GBM risk (OR 0.311 [0.068-1.422], P=0.132).
• Further analysis also showed no significant inverse relationship (OR 1.005 [0.997-1.012], P=0.249).
• Tests for pleiotropy indicated no confounding effects from single nucleotide polymorphisms.

Conclusions:

• This study provides strong evidence against a causal relationship between ischemic stroke and glioblastoma risk.
• The findings suggest that IS does not modify the risk of developing GBM.
• Further research may explore other potential risk factors or biological pathways involved in GBM development.