Serial analysis of GATA1 expression, the allele burden of JAK2 V617F, and clinical events in patients with prefibrotic primary myelofibrosis or primary myelofibrosis.

^*CALR type 1 mutated; ^†CALR type 2 mutated; ^‡Triple negative; ^§Mutations not tested; ^∥JAK2 V617F mutated. Allele burden quantification was not performed.

Abbreviations: AML, transformation to acute myeloid leukemia; F/U, follow-up; mo, month; MF, myelofibrosis; NT, not tested; PMF, primary myelofibrosis; prePMF, prefibrotic primary myelofibrosis.