Evidence of a genetic link between endometriosis and ovarian cancer.

Objective: To evaluate whether endometriosis-associated genetic variation affects risk of ovarian cancer.

Design: Pooled genetic analysis.

Setting: University hospital.

Patient(s): Genetic data from 46,176 participants (15,361 ovarian cancer cases and 30,815 controls) from 41 ovarian cancer studies.

Intervention(s): None.

Main Outcome Measure(s): Endometriosis-associated genetic variation and ovarian cancer.

Result(s): There was significant evidence of an association between endometriosis-related genetic variation and ovarian cancer risk, especially for the high-grade serous and clear cell histotypes. Overall we observed 15 significant burden statistics, which was three times more than expected.

Conclusion(s): By focusing on candidate regions from a phenotype associated with ovarian cancer, we have shown a clear genetic link between endometriosis and ovarian cancer that warrants further follow-up. The functional significance of the identified regions and SNPs is presently uncertain, though future fine mapping and histotype-specific functional analyses may shed light on the etiologies of both gynecologic conditions.