Categories of Ovarian Cancer

Three major categories of ovarian cancer have been identified: Epithelial cancers, arising from the cells lining or covering the ovaries, account for 90% of ovarian malignancies. Epithelial cancers are further classified as serous (most common), endometrioid, clear cell, mucinous, and poorly differentiated. Germ cell cancers start in cells destined to become ova. Stromal cell cancers start in the connective tissue cells that hold the ovaries together and produce female hormones.