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The causality between Type 2 diabetes and breast cancer: a bidirectional two-sample Mendelian randomization study
Lihan Zhang1, Shuochuan Liu1, Guangxing Yue1
1The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, 450008, China.
Future Oncology (London, England)
|April 19, 2024
Summary
This study found no causal link between Type 2 diabetes and breast cancer. Genetic analysis confirmed that neither condition directly causes the other, ruling out a direct biological relationship.
Area of Science:
- Endocrinology
- Oncology
- Genetic Epidemiology
Background:
- Observational studies suggest a link between Type 2 diabetes and breast cancer risk.
- The causal nature of this association remains unclear, with potential confounding factors influencing findings.
Purpose of the Study:
- To investigate the bidirectional causal relationship between Type 2 diabetes and breast cancer.
- Utilizing a genetic approach to overcome limitations of observational studies.
Main Methods:
- Bidirectional Mendelian randomization analysis was employed.
- Summary-level data from large genome-wide association studies for Type 2 diabetes and breast cancer were used.
Main Results:
- Genetically predicted Type 2 diabetes showed no significant association with breast cancer risk or its subtypes.
- Genetically predicted breast cancer (overall and subtypes) did not demonstrate a causal effect on Type 2 diabetes.
- Sensitivity analyses supported the primary findings.
Conclusions:
- The study provides no evidence for a causal relationship between Type 2 diabetes and breast cancer.
- Genetic data suggest that the observed associations in observational studies may be due to confounding factors rather than direct causation.
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