Links Between Common Contraceptives and Circulating Inflammatory Biomarkers
Overview
This study analyzed the association between oral contraceptive (OC) use, intrauterine device (IUD) use, and tubal ligation with circulating inflammatory markers in women. Findings indicate that long-term OC use is associated with increased C-reactive protein (CRP) levels, while IUD use and tubal ligation do not show elevated systemic inflammation.
Background
Ovarian cancer risk has declined partly due to oral contraceptive use and tubal ligation, but IUD use has increased as OC use decreased. Ovarian cancer is linked to inflammation, with acute and chronic inflammatory processes contributing to carcinogenesis. While local inflammation after IUD insertion is documented, the systemic inflammatory effects of contraceptive methods remain unclear. This study investigates circulating inflammatory biomarkers to understand how contraceptive trends may influence ovarian cancer risk.
Data Highlights
Contraceptive Method
Inflammatory Marker
Association
Effect Size
Statistical Significance
Oral Contraceptives (OC)
CRP
Increase with duration
9.9% increase per 5 years of use
P-trend < .0001
Intrauterine Device (IUD)
CRP
Decrease with time since first use
30.4% decrease per 5 years since initial use
P-trend = .03
Tubal Ligation
CRP, IL-6, sTNFR2
No significant difference vs never users
Not applicable
Not significant
Key Findings
No significant differences in inflammatory markers (CRP, IL-6, sTNFR2) were observed between ever and never users of OC, IUD, or tubal ligation after adjustment for confounders.
CRP levels increased by an average of 9.9% for every 5 years of OC use, indicating a rise in systemic inflammation with longer OC duration.
CRP levels decreased by approximately 30.4% for every 5 years since initial IUD use, suggesting a reduction in systemic inflammation over time after IUD insertion.
Tubal ligation was not associated with elevated circulating inflammatory markers long term.
Body mass index and menopausal status modified the association between OC use and CRP levels, highlighting the influence of these factors on inflammation.
Clinical Implications
Clinicians should consider that prolonged OC use may increase systemic inflammation, potentially influencing ovarian cancer risk over time. In contrast, IUD use and tubal ligation do not appear to elevate systemic inflammatory markers, supporting their safety from an inflammation perspective. These findings may guide contraceptive counseling, especially in patients with elevated baseline inflammation or other risk factors.
Conclusion
Long-term OC use is associated with increased circulating inflammation, while IUD use and tubal ligation are not linked to higher systemic inflammatory markers. This differential impact on inflammation may partly explain variations in ovarian cancer risk related to contraceptive methods.
References
Nurses’ Health Study and NHSII -- Links Between Utilization of Common Contraceptives and Levels of Inflammatory Biomarkers in Circulation
