Objective:

To establish the causal relationship between gastroesophageal reflux disease (GERD) and pancreatic cancer (PC) and to explore the mediating role of omega-6 to omega-3 fatty acid ratios.

Key Findings:

• GERD may be associated with an increased risk of pancreatic cancer, potentially mediated by bile acids and proton pump inhibitors, highlighting the need for further research.
• Omega-3 polyunsaturated fatty acids (PUFAs) may protect against pancreatic cancer, while omega-6 PUFAs may increase risk.
• Conflicting evidence exists regarding the relationship between GERD and pancreatic cancer, necessitating further research.

Interpretation:

The study suggests a complex interplay between GERD, omega-6/omega-3 PUFA ratios, and pancreatic cancer risk, indicating that dietary factors may significantly influence cancer development.

Limitations:

• Observational studies have inherent biases and confounding factors, such as selection bias and measurement error.
• The reliance on genetic variants as instrumental variables may not capture all aspects of the exposures.

Conclusion:

Further research is needed to clarify the role of GERD and dietary fatty acids in pancreatic cancer risk, particularly focusing on the underlying mechanisms.