Figure 2. Kaplan-Meier curves for progression-free survival (PFS, left) and overall survival (OS, right) of patients in the four treatment groups. GC-f: Full-dose gemcitabine plus cisplatin; GC-r: reduced-dose gemcitabine plus cisplatin; G-Car-f: full-dose gemcitabine plus carboplatin; GCar-r: reduced-dose gemcitabine plus carboplatin; Ctx: chemotherapy.