- Six histotypes of ovarian carcinoma includes: 1) high-grade serous carcinoma which accounts for the highest rate of 46.3%, 2) mucinous carcinoma (15.8%), 3) endometrioid carcinoma (14.7%), 4) low-grade serous carcinoma (11.6%), 5) clear cell carcinoma (7.4%), and 6) serousmucinous carcinoma with the lowest rate of 4.2%.