Characteristics of patients grouped according to their genotype. (A) Frequency of different mutations among 34 patients with ET, median age, and median follow-up of each group. (B) Hematologic and clinical findings at diagnosis in each group of patients. Data on clonality of hematopoiesis are relative to the time of molecular testing. Only significant results are shown. CALR, CALR mutated; JAK2, JAK2^V617F mutated; WT, wild type for JAK2, CALR, and MPL.