Fig. 9

Kaplan–Meier CSS curves for all elderly EOC patients based on the new risk stratification system. Kaplan–Meier CSS curves of patients with various surgery types in the low- (A), medium- (C), and high-risk group (E); Kaplan–Meier curves of patients with or without chemotherapy in the low- (B), medium- (D), and high-risk group (F) for predicting CSS