World Endometriosis Society consensus on the classification of endometriosis

  • 2017-12-21
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World Endometriosis Society consensus on the classification of endometriosis.

Johnson NP1,2,3,4, Hummelshoj L5,6, Adamson GD6,7, Keckstein J8, Taylor HS9, Abrao MS5,10, Bush D11, Kiesel L5,12, Tamimi R13, Sharpe-Timms KL5,14, Rombauts L5,15, Giudice LC; for the World Endometriosis Society Sao Paulo Consortium.


STUDY QUESTION: What is the global consensus on the classification of endometriosis that considers the views of women with endometriosis?

SUMMARY ANSWER: We have produced an international consensus statement on the classification of endometriosis through systematic appraisal of evidence and a consensus process that included representatives of national and international, medical and non-medical societies, patient organizations, and companies with an interest in endometriosis.

WHAT IS KNOWN ALREADY: Classification systems of endometriosis, developed by several professional organizations, traditionally have been based on lesion appearance, pelvic adhesions, and anatomic location of disease. One system predicts fertility outcome and none predicts pelvic pain, response to medications, disease recurrence, risks for associated disorders, quality of life measures, and other endpoints important to women and health care providers for guiding appropriate therapeutic options and prognosis.

STUDY DESIGN, SIZE, DURATION: A consensus meeting, in conjunction with pre- and post-meeting processes, was undertaken.

PARTICIPANTS/MATERIALS, SETTING, METHODS: A consensus meeting was held on 30 April 2014 in conjunction with the World Endometriosis Society's 12th World Congress on Endometriosis. Rigorous pre- and post-meeting processes, involving 55 representatives of 29 national and international, medical and non-medical organizations from a range of disciplines, led to this consensus statement.

MAIN RESULTS AND THE ROLE OF CHANCE: A total of 28 consensus statements were made. Of all, 10 statements had unanimous consensus, however none of the statements was made without expression of a caveat about the strength of the statement or the statement itself. Two statements did not achieve majority consensus. The statements covered women's priorities, aspects of classification, impact of low resources, as well as all the major classification systems for endometriosis. Until better classification systems are developed, we propose a classification toolbox (that includes the revised American Society for Reproductive Medicine and, where appropriate, the Enzian and Endometriosis Fertility Index staging systems), that may be used by all surgeons in each case of surgery undertaken for women with endometriosis. We also propose wider use of the World Endometriosis Research Foundation Endometriosis Phenome and Biobanking Harmonisation Project surgical and clinical data collection tools for research to improve classification of endometriosis in the future, of particular relevance when surgery is not undertaken. ............ (Full text is attached.)