Fig. 2

The Kaplan–Meier analyses of the PFS (a) and OS (b) for patients without IP (blue) vs. patients with IP (red) who were treated with chemotherapy. The OS of patients who only received BSC (b). The median OS of all patients was 9.6 (95% CI: 7.8–11.4) months. P values were determined by the log-rank test; the number of individuals in each group and median survival time (95% CI) are indicated