Epithelial ovarian cancer is cancer which originates from a surface cell of the ovary. It is the most common form of ovarian cancer, and most cases occur in post-menopausal women, usually in their 60s or 70s. Unfortunately, the vast majority (65%) of women with ovarian epithelial cancer are diagnosed with advanced stage (stage III) disease. In almost all cases, early ovarian cancer is picked up as incidental findings in someone who is having treatment for an unrelated problem.