highly significantP <0.001
With a median follow-up of 20.7 months, this translated into a highly significant improvement of progression-free survival (median 13.8 vs. 3.6 months; hazard ratio=0.40 [95% confidence interval: 0.28-0.57]; P <0.001) and overall survival (median 25.5 vs. 12.9 months; hazard ratio=0.62 [95% confidence interval: 0.43-0.88]; P =0.006).