Kaplan-Meier survival curves of 91 patients with myelofibrosis with myeloid metaplasia. The survival curves show data from (A) the diagnosis of myelofibrosis with myeloid metaplasia (whole cohort); (B) the time of leukemic transformation (whole cohort); (C) the time of leukemic transformation (stratified by having received treatment versus supportive care alone); and (D) the time of leukemic transformation (stratified by having received induction chemotherapy).