How is ovarian cancer caused?

No one cause: There is no specific cause for ovarian cancer, but several risk factors have been identified. Women who have a family history of either ovarian, breast, or colon cancer all are at increased risk for ovarian cancer. Most ovarian cancers are diagnosed in the six or seventh decades of life, and typically arise from the ovarian epithelium. There is no effective screening test for ovarian cancer.

Also: If familial, breast cancer, prostate cancer and colon cancer all lie on the braca gene.