Fig. 4

Kaplan-Meier analyses of disease-free survival (DFS) and overall survival (OS) time by clinicopathological features. a, b Significant differences in DFS (P = 0.006) and OS (P = 0.015) time were observed between large and small tumor sizes. c, d Significant differences in DFS (P = 0.001) and OS (P = 0.010) time were observed between Enneking stages I-IIA and IIB. e, f Significant differences in DFS (P = 0.002) and OS (P = 0.001) time were demonstrated between good and poor responses to chemotherapy. *Good: tumor necrosis ≥90%; poor: tumor necrosis < 90%