The cure rate for early-stage ovarian cancer is still relatively high. For stage I ovarian cancer, the five-year survival rate can reach over 90%, but 80% of ovarian cancer patients are already at stage III by the time they are seen. Therefore, the overall survival rate of ovarian cancer patients is not high. Worldwide, the 5-year survival rate is about 20-30%. Especially for patients with advanced stage, most of them have to face the recurrence and metastasis of tumor, so that the cure rate of advanced stage is very low.