Kaplan-Meier survival analysis in relation to each prognostic model for OS and TTP. Red and blues lines indicate the high- and low-risk groups, respectively. The vertical bar represents the OS and the TTP probability (%), whereas the horizontal bar represents the follow-up time in months. Patients at risk at the corresponding time point are shown. Statistical significance (P) was that associated with the log-rank test. (A-B) AITL, (C-D) PTCL-NOS, and (E-F) PTCL-TFH.