Causal Relationship Between Endometriosis and Pelvic Inflammatory Diseases: Mendelian Randomization Study

Area of Science:

• Reproductive Health
• Genetics
• Epidemiology

Background:

• Endometriosis is a chronic condition affecting women of reproductive age.
• Pelvic inflammatory disease (PID) is a serious infection that can lead to long-term health issues.
• The relationship between endometriosis and PID requires further investigation.

Purpose of the Study:

• To investigate the potential causal relationship between endometriosis and pelvic inflammatory disease (PID).
• To assess whether endometriosis increases the risk of developing PID using genetic data.

Main Methods:

• Utilized genome-wide association study (GWAS) datasets for endometriosis and PID.
• Conducted two-sample Mendelian randomization (MR) analyses employing inverse variance weighting (IVW), MR-Egger, and weighted median (WM) methods.
• Assessed heterogeneity using Cochran's Q test and removed outliers for robust causality assessment.

Main Results:

• Identified 33 single nucleotide polymorphisms (SNPs) from endometriosis GWAS data as instrumental variables.
• All MR methods (IVW, MR-Egger, WM) demonstrated a significant causal relationship between endometriosis and PID (e.g., IVW OR = 1.39, P < 1×10⁻⁸).
• Results remained consistent after excluding individual SNPs, and heterogeneity analyses showed no significant SNP asymmetry.

Conclusions:

• Mendelian randomization analysis provides evidence supporting a causal link between endometriosis and an increased risk of PID.
• This finding suggests that endometriosis may be a risk factor for developing pelvic inflammatory disease.