Overall survival and relapse-free survival according to (A) classic IPI, (B) NCCN-IPI, and (C) modified IPI.

Abbreviations: H, high-risk group; H-I, high-intermediate; IPI, International Prognostic Index; L, low; L-I, low-intermediate; NCCN-IPI, National Comprehensive Cancer Network-International Prognostic Index; RFS, relapse-free survival.