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Genetic Susceptibility to Nonalcoholic Fatty Liver Disease and Risk for Pancreatic Cancer: Mendelian Randomization
Sontoria D King1, Swathi Veliginti2, Martijn C G J Brouwers3,4
1Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Jacksonville, Florida.
Genetic predisposition to nonalcoholic fatty liver disease (NAFLD) does not increase pancreatic cancer risk. This Mendelian randomization study found no association, suggesting metabolic factors may explain prior observations.
Area of Science:
- Hepatology and Gastroenterology
- Oncology
- Genetic Epidemiology
Background:
- Conflicting data exist regarding the association between nonalcoholic fatty liver disease (NAFLD) and pancreatic cancer susceptibility.
- NAFLD is closely linked to metabolic conditions like obesity and diabetes, which are also risk factors for pancreatic cancer.
Purpose of the Study:
- To investigate the relationship between genetic predisposition to NAFLD and the risk of developing pancreatic cancer using Mendelian randomization (MR).
Main Methods:
- Utilized genome-wide association study data from large consortia (PanScan and PanC4) including thousands of cases and controls.
- Employed four MR methods (IVW, MR-Egger, simple median, penalized weighted median) with 68 genetic variants to assess NAFLD heritability.
- Analyzed the association between genetically predicted NAFLD and pancreatic cancer risk, adjusting for key risk factors like obesity and diabetes.
Main Results:
- No statistically significant association was found between genetically predicted NAFLD and pancreatic cancer risk in either the PanScan or PanC4 samples.
- All four MR methods consistently showed no link between genetic predisposition to NAFLD and pancreatic cancer.
- Specific results included IVW ORs of 1.04 (95% CI, 0.88-1.22) for PanScan and 1.07 (95% CI, 0.90-1.27) for PanC4.
Conclusions:
- Genetic predisposition to NAFLD is not causally associated with an increased risk of pancreatic cancer.
- Observed associations between NAFLD and pancreatic cancer may be confounded by shared metabolic perturbations such as obesity and diabetes.
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