Unraveling the two entities of endometrioid ovarian cancer: A single center clinical experience

Giorgia Mangili, Alice Bergamini, Gianluca Taccagni, Cinzia Gentile, Paola Panina, Paola Viganò, Massimo Candiani

Research output: Contribution to journalArticlepeer-review


Objective: Due to the increasing prevalence of the benign condition, ovarian carcinoma arising from endometriosis is emerging as a relevant clinical entity with an unclear biological signature. We have investigated clinical and histologic features of endometriosis-associated endometrioid ovarian cancer using an institutional retrospective database. Methods: Patients diagnosed with endometrioid ovarian cancer at our institution were divided into two groups according to the fulfillment or not of Sampson's and Scott's criteria for the detection of endometriosis-associated ovarian cancer. Clinical and histological data were reported and compared. Survival analysis was obtained using the log-rank test in an unadjusted Kaplan-Meier method. Multivariate analysis was performed using the Cox proportional hazards regression model to establish independent factors associated with endometriosis-associated endometrioid ovarian cancer and to identify predictors of survival. The degree of concordance was evaluated by Cohen's Kappa measures. Results: Patients with endometriosis-associated endometrioid ovarian cancer were significantly younger, had a lower disease stage (62% vs 23%; p = 0.003), a less prevalent high grade tumor (38% vs 82%; p = 0.002) and a higher prevalence of squamous and mucinous metaplasia. The rate of endometrial cancer diagnosis was significantly higher in women with endometriosis-associated endometrioid ovarian cancer (33%) than in other patients (11%) (p = 0.04) with a 92% concordance between ovarian and endometrial histologic tumor grade. A significant difference in survival rate could not be demonstrated between patients with or without endometriosis. Conclusions: The analysis of a retrospective endometrioid ovarian cancer database may allow to suggest a 40 molecular, morphological and clinical parallelism between endometrial and endometrioid ovarian cancers.

Original languageEnglish
Pages (from-to)403-407
Number of pages5
JournalGynecologic Oncology
Issue number3
Publication statusPublished - Sep 2012


  • Endometrial cancer
  • Endometrioid ovarian cancer
  • Endometriosis

ASJC Scopus subject areas

  • Obstetrics and Gynaecology
  • Oncology


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