The cumulative survival rate at 1 year, 2 year and 3 year was 94.6%, 72.3% and 26.9%, respectively with the mean overall survival time being 48.5 months (95% CI: 44.7 - 52.4 months), the mean progression free survival time being 30.9 months (95% CI: 28.7 - 33.0 months).