Is there a risk getting Ovarian Cancer?

I was wondering if there is risk getting ovarian cancer when you have endometriosis

There have been extensive studies on Endometriosis-cancer links, and a risk does exist. With regard to ovarian cancer specifically, an analysis based on pooled data from four population-based U.S. studies showed a 30% higher risk overall for women with a history of endometriosis vs. non-Endo controls. The risk declines in ratio to the number of live births (e.g., the more live births, the lower than woman's risks). Oral contraceptives, used frequently used to quell some of the symptoms in many women with Endo on a temporary basis, also seemed to confer a protective benefit as well, with the study showing a reduced risk among OC users overall, Endo and non-Endo. It is important to remember that it is still unclear whether Endometriosis is specifically a precursor to Endo-associated ovarian cancer, or whether there is an indirect link because similar factors predispose to both diseases. It is important to be aware of the research and potential risk factors, but don't immediately assume it will happen to you - there are nearly 90 million women and girls around the world living with Endo; only a small number of them will develop ovarian or other cancers as a result (or in addition to, as the case may be). Hope that helps. Source(s): 1] Perspectives on Sexual and Reproductive Health; Volume 37, Number 1, March 2005.
2] Modugno F et al., Oral contraceptive use, reproductive history, and risk of epithelial ovarian cancer in women with and without endometriosis, American Journal of Obstetrics and Gynecology, 2004, 191(3):733-740.
3] Genetic Evidence Supports Endometriosis as Ovarian Cancer Precursor; Reuters Health; 8/4/06.

First off you need to know what endometriosis is and once you know what it is you would know that the chances of getting ovarian cancer from it is probably slim and none though I would suppose that in very extreme cases the risk is there.