Markedly increased risk of malignancies in women with endometriosis

Kyung Jin Eoh, Minkyung Han, Eun Hwa Kim, Inkyung Jung, Young Tae Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Objective: To assess the cancer risk in a cohort of women with newly diagnosed endometriosis. Methods: This retrospective, nationwide, population-based cohort study utilized data from the 10-year claims database of the Korean National Health Insurance from January 2008 to December 2018. Patients diagnosed with endometriosis between 2010 and 2013 were included; those who underwent appendectomy but were not diagnosed with endometriosis during the study period served as controls. No participant was diagnosed with cancer before enrollment. Cancer diagnoses according to the International Classification of Diseases, 10th revision, were compared between the two groups. Cancer occurrence in both groups was identified according to the diagnostic codes for different organ sites. Results: Altogether, 179,865 patients with endometriosis and 87,408 controls were analyzed, and the incidence rates of cancer were 644.3 and 543.8 per 100,000 person-years, respectively. Patients with endometriosis had a significantly increased overall cancer risk (hazard ratio [HR], 1.34; 95% confidence interval [CI], 1.28–1.40; p < 0.001) than controls after adjusting for age, insurance type, and comorbidities. They had significantly increased uterine (HR, 4.59; 95% CI, 3.56–5.91; p < 0.001), ovarian (HR, 2.51; 95% CI, 1.99–3.16; p < 0.001), cervical (HR, 1.84; 95% CI, 1.49–2.28; p < 0.001), breast (HR, 1.44; 95% CI, 1.31–1.58; p < 0.001), and thyroid cancer (HR, 1.34; 95% CI, 1.24–1.45; p < 0.001) risk. Median age at diagnosis was <50 years for all cancer types. Conclusions: Endometriosis was associated with an increased cancer risk, specifically uterine, ovarian, cervical, breast, and thyroid cancers, suggesting that effective cancer screening for early detection of malignancies in women should be implemented in those with endometriosis.

Original languageEnglish
Pages (from-to)291-296
Number of pages6
JournalGynecologic Oncology
Issue number1
Publication statusPublished - 2021 Apr

Bibliographical note

Funding Information:
This research was supported by a faculty research grant of Yonsei University College of Medicine ( 9-2020-0088 ) and the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science, and Technology ( NRF-2018R1D1A1B07049578 ).

Publisher Copyright:
© 2021 Elsevier Inc.

All Science Journal Classification (ASJC) codes

  • Oncology
  • Obstetrics and Gynaecology


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