Kaplan-Meier analysis illustrating overall survival, myelofibrosis-free survival, leukemia-free survival, thrombosis-free survival, and bleeding-free survival in ExT and non-ExT patients. (A) Overall survival. (B) Myelofibrosis-free survival. (C) Leukemia-free survival. (D) Thrombosis-free survival. (E) Bleeding-free survival.