PFS according to the PRIMA-PI, FLIPI, and FLIPI-2 by age. Kaplan-Meier curves showing PFS of risk cohorts defined by the 3 scores for patients ≤60 years (left) and >60 years (right). Log-rank P values are shown in the graph. Sizes and relations of high-risk cohorts identified by the 3 scores are shown by a scaled Venn diagram (only patients evaluable for all scores).