The risk of developing ovarian cancer appears to jump about fourfold among women with endometriosis, compared with women who haven’t been diagnosed with the condition, a new study finds.

Scientists have known that endometriosis may be linked with an increased ovarian cancer risk, but the study details how that risk can vary by subtypes of endometriosis.

Endometriosis is a common and often painful condition that happens when tissue similar to the lining of the uterus grows outside the uterus itself. It’s estimated to affect more than 11% of women between the ages of 15 and 44 across the United States.