Oral contraceptives and risk of endometriosis: a systematic review and meta-analysis

Paolo Vercellini, Eskenazi B, Brenda Eskenazi, Consonni D, Dario Consonni, Edgardo Somigliana, Fabio Parazzini, Abbiati A, Annalisa Abbiati, Luigi Fedele
Human Reproduction Update · 2010 · vol. 17(2) , pp. 159–170 · doi:10.1093/humupd/dmq042 · PMID:20833638 · W2098330734
Systematic review / meta-analysis OA: bronze CC0 ⤵ 141 in-corpus citations
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This meta-analysis of 18 studies found that current combined oral contraceptive use was associated with a reduced risk of endometriosis, but past or ever use showed no significant association.

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Abstract

BACKGROUND: Combined oral contraceptives (OCs) inhibit ovulation, substantially reduce the volume of menstrual flow and may hypothetically interfere with implantation of refluxed endometrial cells. The aim of this review is to establish if OC use influences the risk of endometriosis. METHODS: We performed a MEDLINE search to identify all studies published in the last four decades (January 1970 to January 2010) in the English language on the relationship between OC exposure and risk of endometriosis. Two authors abstracted data on standardized forms. RESULTS: We identified 608 potentially relevant studies and 18 studies (6 cross-sectional, 7 case-control and 5 cohort) were selected. Pooling of the results derived from all the included reports independently from study design, yielded a common relative risk of 0.63 [95% confidence interval (CI), 0.47-0.85] for current OC users, 1.21 (95% CI, 0.94-1.56) for past users and 1.19 (95% CI, 0.89-1.60) for ever users. Methodological drawbacks, such as uncertain temporal relationship between exposure and outcome in cross-sectional studies and suboptimal selection of controls in case-control studies, limit the quality of the available evidence. CONCLUSIONS: The risk of endometriosis appears reduced during OC use. However, it is not possible to exclude the possibility that the apparent protective effect of OC against endometriosis is the result of postponement of surgical evaluation due to temporary suppression of pain symptoms. Confounding by selection and indication biases may explain the trend towards an increase in risk of endometriosis observed after discontinuation, but further clarification is needed. To date, the hypothesis of recommending OCs for primary prevention of endometriosis does not seem sufficiently substantiated.

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Condition tags

endometriosis

MeSH descriptors

Contraceptives, Oral Endometriosis Risk Assessment Risk Assessment Adolescent Adolescent Adult Adult Aged Aged Aged, 80 and over Aged, 80 and over Case-Control Studies Case-Control Studies Cohort Studies Cohort Studies Contraceptives, Oral Contraceptives, Oral Cross-Sectional Studies Cross-Sectional Studies

Citation neighborhood (2-hop)

Papers in the corpus that this work cites (lower rings, blue) and that cite this one (upper rings, green). Dot size scales with the paper's in-corpus citation count — bigger dot = more influential within the endo/adeno field. Click a dot to open that paper. Outer rings show 2-hop neighbours — papers reached through the immediate citers/citees. [ collapse to 1-hop ]

References (56)

Cited by (50)

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