Five histological subtypes clear cell carcinoma a. A rare subtype b Is high grade and aggressive C. Prognosis is similar to or worse than that of papillary serous carcinoma d survival rate is lower 33%-64%Five histological subtypes --Clear cell carcinoma a. A rare subtype b. Is high grade and aggressive c. Prognosis is similar to or worse than that of papillary serous carcinoma d. Survival rate is lower 33%~64%