Fig. 4

Kaplan-Meier curves of overall survival in the first-line gemcitabine group, S-1 group, and gemcitabine plus nab-paclitaxel group (a); and progression-free survival in the first-line gemcitabine group, S-1 group, and gemcitabine plus nab-paclitaxel group (b). OS, overall survival; PFS, progression-free survival