Fig. 3

Survival curves of patients with ENKTL according to the Korean Prognostic Index (KPI) score. a OS curves of patients with KPI score = 0–1 according to the KPI model. b OS curves of patients with KPI score = 1–2 according to the KPI model. c OS curves of patients with KPI score = 2–4 according to the KPI model. d OS curves of patients with KPI score = 0–1 according to blood types O and non-O. e OS curves of patients with KPI score = 1–2 according to blood types O and non-O. f OS curves of patients with KPI score = 2–4 according to blood types O and non-O