Cancer endometriosis evidence — Dr. Nishtha Tripathi Patel is an ESGO-certified gynaecological oncosurgeon offering specialist consultations and surgical care at Sterling Hospitals, KD Hospital and Welcare Speciality Hospital in Ahmedabad. This page covers cancer endometriosis evidence for patients, families and referring doctors looking for evidence-based, India-context information.
On this page
- Does Endometriosis Cause Cancer?
- The Evidence
- Endometriosis-Associated Ovarian Cancer (EAOC)
- What Should Women With Endometriosis Do?
Cancer endometriosis evidence — Does Endometriosis Cause Cancer?
Endometriosis — a condition where tissue similar to the endometrium grows outside the uterus — affects approximately 10% of women of reproductive age. The relationship between endometriosis and cancer is nuanced: endometriosis is not itself a cancer, but it is associated with an increased risk of certain ovarian cancer subtypes.
The Evidence
Large epidemiological studies have established the following associations:
- Clear-cell ovarian cancer — approximately 3-fold increased risk in women with endometriosis
- Endometrioid ovarian cancer — approximately 2-fold increased risk
- Overall ovarian cancer risk — modestly elevated (relative risk approximately 1.3–1.5)
To put this in perspective: the lifetime risk of ovarian cancer in the general population is approximately 1.3%. A 2–3 fold increase brings this to roughly 2.5–4% — still a low absolute risk. The vast majority of women with endometriosis will never develop ovarian cancer.
Endometriosis-Associated Ovarian Cancer (EAOC)
The biological mechanism is not fully understood, but the prevailing theory is that chronic inflammation and oxidative stress within endometriotic cysts (endometriomas) create a micro-environment that promotes cellular transformation. The presence of an endometrioma — particularly one that is large, long-standing, or has changed in character — warrants specialist assessment.
What Should Women With Endometriosis Do?
- Do not panic — the absolute risk increase is small
- Monitor endometriomas — any change in size, new solid components, or new symptoms should prompt ultrasound reassessment
- Report new symptoms — persistent bloating, pelvic pain that changes character, or new bowel/bladder symptoms after menopause
- Consider specialist review — if you have long-standing endometriosis and are approaching or past menopause, a consultation with a gynaecological oncologist can provide personalised risk assessment
Dr. Nishtha Tripathi Patel manages complex endometriosis and endometriosis-associated ovarian masses in Ahmedabad. Contact: +91 76988 00333.
Related and References
- Internal: About Dr. Nishtha Tripathi Patel
- Internal: About Dr. Nishtha Tripathi Patel
- External: NCCN Guidelines for Gynaecological Cancers