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Ovary cancer is a kind of malignant tumor of ovary. It refers to malignant tumors growing on the ovary. 90% to 95% of these tumors are primary cancers of the ovary, and 5% to 10% are metastases of primary cancers from other parts of the ovary. Early diagnosis is difficult because of the lack of early symptoms of ovary cancer, the lack of specificity of symptoms, and the limited effectiveness of screening. Sixty to seventy percent of ovary cancer is late at diagnosis, and the outcome of late cases is poor. Thus, although the incidence of ovary cancer is lower than that of cervical cancer and endometrial cancer, which rank third among gynecological malignancies, the mortality rate is higher than that of cervical cancer and endometrial cancer combined.