{"id":157,"date":"2026-10-28T10:49:55","date_gmt":"2026-10-28T00:49:55","guid":{"rendered":"https:\/\/escope.ages.com.au\/november-2026\/?p=157"},"modified":"2026-10-28T14:34:05","modified_gmt":"2026-10-28T04:34:05","slug":"journal-club-01-endometriosis-and-ovarian-cancer-does-phenotype-matter","status":"publish","type":"post","link":"https:\/\/escope.ages.com.au\/november-2026\/journal-club-01-endometriosis-and-ovarian-cancer-does-phenotype-matter\/","title":{"rendered":"Journal Club 01: Endometriosis and ovarian cancer: does phenotype matter?"},"content":{"rendered":"\n<h1>\n\t\t\tEndometriosis and ovarian cancer: does phenotype matter?\t<\/h1>\n\t\t\t\t<p>Endometriosis is associated with increased epithelial ovarian cancer risk, but how should this influence counselling and surgical decision-making? Barnard and colleagues&#8217; population-based retrospective cohort study examined whether risk differs by endometriosis phenotype and cancer histotype.<\/p>\n<p>Using linked Utah health and cancer registry data from 1992-2019, investigators compared 78,476 women with endometriosis with 372,430 women without it. During approximately 12 years of mean follow-up, 597 ovarian cancers were identified. Endometriosis was associated with higher ovarian cancer incidence (adjusted hazard ratio [aHR] 4.20; 95% CI 3.59-4.91). However, the absolute risk difference was approximately 9.9 additional cases per 10,000 women. This distinction is central to counselling: a substantial relative association does not mean ovarian cancer is common in an individual patient.<\/p>\n<p>The association varied by histotype. Strongest associations were seen with cancers conventionally considered endometriosis-associated. Reported aHRs were 11.15 for clear-cell, 7.96 for endometrioid, 8.12 for low-grade serous, 4.56 for mucinous and 2.70 for high-grade serous carcinoma. Chronic inflammation, oxidative stress and iron exposure within endometriotic lesions may contribute to DNA damage and malignant transformation, particularly in clear-cell and endometrioid cancers. These mechanisms are plausible hypotheses, not proof of causation.<\/p>\n<p>Phenotype also mattered. Women with an ovarian endometrioma and\/or deep infiltrating endometriosis (DIE) had the strongest association with ovarian cancer overall (aHR 9.66; absolute risk difference approximately 26.7 per 10,000). For type I cancers, the aHR was 18.96. These estimates warrant caution: DIE was uncommon in the cohort, confidence intervals were wide, and endometriosis subtypes were identified from diagnostic codes rather than surgical confirmation.<\/p>\n<p>Strengths include the large, population-based cohort, long follow-up, cancer-registry outcomes and phenotype- and histotype-specific analyses. Limitations include retrospective design, potential detection bias, residual confounding (including incompletely captured genetic and hormonal risks), and limited generalisability from a predominantly White population. Bilateral oophorectomy was also more common among women with endometriosis, potentially affecting the population remaining at risk over time.<\/p>\n<p>For minimally invasive gynaecology surgeons, these findings support individualised counselling-not automatic excision of an asymptomatic endometrioma or prophylactic oophorectomy solely to reduce cancer risk. Decisions should consider symptoms, imaging, lesion behaviour, age, fertility goals, family and genetic history, planned surgery and the consequences of premature menopause. Given the low absolute risk and lack of evidence that ovarian cancer screening improves mortality, routine ultrasound or CA-125 screening solely because a patient has endometriosis is not supported. New or changing suspicious imaging features require appropriate reassessment.<\/p>\n<p>The key message is that ovarian cancer risk associated with endometriosis is heterogeneous. Endometrioma and DIE are associated with greater risk, particularly for clear-cell and endometrioid cancers, but this study establishes association rather than causation. Prospective studies with accurate phenotyping and long-term outcomes are needed before these findings can guide preventive surgery.<\/p>\n<p>Reference: Barnard ME, Farland LV, Yan B, et al. Endometriosis Typology and Ovarian Cancer Risk. JAMA. 2024;332(6):482-489. doi:10.1001\/jama.2024.9210.<\/p>\n<figure itemscope itemtype=\"https:\/\/schema.org\/ImageObject\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/escope.ages.com.au\/november-2026\/wp-content\/uploads\/sites\/14\/2026\/10\/Dr-James-T.jpg\" alt=\"Dr James T\" height=\"400\" width=\"300\" title=\"Dr James T\" onerror=\"this.style.display='none'\" loading=\"lazy\" \/>\n\t<\/figure>\n\t\t\t\t<p><strong>Dr James Trotta<\/strong><br \/>FRANZCOG Advanced Trainee (Level 5) BBiomed, MD <br \/>Monash Women&#8217;s I Monash Health<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>The key message is that ovarian cancer risk associated with endometriosis is heterogeneous.<\/p>\n","protected":false},"author":1,"featured_media":72,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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