Survival curves of patients at high and low risk as identified with MTV/ECOG, IMPI, and clinical PET models using 2-year progression-free survival as outcome. (A) Risk groups of the MTV/ECOG as defined in the original publication³² and high-risk groups of the IMPI and clinical PET models are of equal size as the high-risk IPI group. (B) Risk groups for all models are of equal size as the MTV/ECOG groups.