Surgery in platinum-resistant recurrent epithelial ovarian carcinoma

Figure 4 Kaplan-Meier survival curves for subgroup analysis of chemotherapy-free interval. The absence of residual lesions after cytoreductive surgery (P = 0.013) was associated with improved chemotherapy-free interval. A: Age (P = 0.852); B: Eastern collaborative oncology group score (P = 0.200); C: Pathological type (P = 0.071); D: Tumor differentiation (P = 0.200); E: Residual lesions after cytoreductive surgery (P = 0.013); F: Number of chemotherapy lines (P = 0.909); G: The number of previous surgeries (P = 0.142); H: Targeted drugs (P = 0.508). ECOG: Eastern collaborative oncology group.