Ovarian cancer begins with the formation of a tumor in awoman’s ovary. It is classified as the epithelial cancer caused by genetic alterations that disrupts the regulation of proliferation, apoptosis, senescence, and DNA repair [1]. Ovarian cancer ranks fifth in cancer deaths among women and accounts for more deaths than any other cancer of the female reproductive system [2]. It is estimated that in United States, 2012, about 22,280 women receive new diagnoses of ovarian cancer and about 15,500 patients die from it [2]. Early detection of ovarian cancer is crucial because statistics [3] show that the five-year survival rate of ovarian cancer is greater than 75% if diagnosis occurs before the cancer cells have spread to other organs (stage I), but it drops to 20% when the cancer cells have spread to upper abdomen (stage III). However, early detection of ovarian cancer is not easy because it is rather hard to tell by the symptoms when a tumor in the ovary turning from benignancy to malignancy. Even annual routine gynecologic and pelvic examinations have only detected 3% of the early stage ovarian cancer cases [4]. Furthermore, the accurate staging of ovarian cancer is also important because the treatment options depend on the type and the stage that ovarian cancer has advanced to [5]. Therefore, early detection and accurate staging of ovarian cancer are of great interests and importance because they are the keys to improve the survival rate of a patient [6].