Fig. 3: Kaplan–Meier estimated the overall survival of traditional IPI classification and IPI + RS in different cohorts.

A–C Kaplan–Meier estimated the overall survival of traditional IPI classification in the internal validation cohort (n = 100), the external validation cohort (n = 160), and the whole cohort (internal + external validation cohort, n = 260). D–F Kaplan–Meier estimated the overall survival of IPI + RS classification in the internal validation cohort (n = 100), the external validation cohort (n = 160), and the whole cohort (the internal + external validation cohort, n = 260). G–I ROC curve of IPI, IPI + RS in the internal validation cohort (n = 100), the external validation cohort (n = 160) and the whole cohort (internal + external validation cohort, n = 260).