Figure 3 Forest plots of overall outcomes for progression-free survival (PFS). Hazard ratios (HRs) for each trial are represented by the squares, and the horizontal lines crossing the square show the 95% confidence intervals (CIs). The diamonds represent the estimated pooled effect of the overall outcome for PFS in NSCLC. All P values are two-sided. STATA (version 13.1; Stata Corporation, College Station, TX, USA) was used.