Analysis of cyclooxygenase-2 (COX-2) expression in different sites of endometriosis and correlation with clinico-pathological parameters

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This study found increased cyclooxygenase-2 expression in the ovarian endometriotic cyst wall compared to other sites, but no correlation with clinico-pathological parameters or patient symptoms.

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Abstract

BACKGROUND: Recent studies have demonstrated the overexpression of cyclooxygenase-2 (COX-2) in endometriosis. The aim of this study was to investigate the expression of COX-2 in different anatomical sites of endometriosis and its association with clinico-pathological parameters in a single institutional series of patients undergoing operative treatment. METHODS: COX-2 expression was analysed by immunohistochemistry in 136 samples of endometriotic tissue from 103 patients affected by endometriosis. RESULTS: COX-2 immunoreaction was observed in 78.5% of ovarian endometriotic cysts, in 11.1% of peritoneal implants and 13.3% of recto-vaginal nodules. COX-2 positivity was not distributed differently according to age, pre-operative serum levels of CA125 and AFS score. Moreover, COX-2 positivity did not show any significant variation according to the subjective intensity of pain, as dysmenorrhoea, chronic pelvic pain, lower urinary tract or gastrointestinal symptoms, or according to infertility. CONCLUSIONS: Increased COX-2 expression in the endometriotic ovarian cyst wall was observed with respect to other extraovarian localizations. No relevant correlations between COX-2 positivity and clinico-pathological characteristics and symptoms of patients were observed.

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Condition tags

endometriosischronic_pelvic_paindysmenorrheainfertility

MeSH descriptors

Endometriosis Endometriosis Isoenzymes Prostaglandin-Endoperoxide Synthases Adult Adult CA-125 Antigen CA-125 Antigen CA-125 Antigen Cyclooxygenase 2 Cyclooxygenase 2 Endometriosis Endometriosis Endometriosis Female Female Humans Humans Immunohistochemistry Immunohistochemistry

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References (24)

Cited by (48)

Source provenance

europepmc
last seen: 2026-10-18T09:30:06.152893+00:00
openalex
last seen: 2026-06-10T17:14:06.276822+00:00
pubmed
last seen: 2026-10-08T21:02:19.201584+00:00
License: CC0 · commercial use OK