There are three main types of ovarian cancer, according to the type of cells in the ovary where the cancer originates.
Ovarian epithelial cancer – also known as surface epithelial-stromal tumor, ovarian epithelial carcinoma begin in the cells located on the outer surface of the ovary; it is the most common type of ovarian cancer, representing nearly 80% of ovarian malignancies.
Ovarian germ cell tumors– these forms of ovarian cancer are more common among young women and girls; they are account for less 12% of ovarian cancers. Ovarian germ cell tumors develops in the cells that produce eggs; they are less common than epithelial ovarian cancer but usually more aggressive.
Stromal Tumors of the Ovary – these cancers develop in the connective tissue cells that hold various elements of the ovary together; it accounts for nearly 8% of ovarian cancers. Stromal tumors are less common than epithelial.