FROM- Fondazione per la Ricerca Ospedale di Bergamo- ETS
International multicenter retrospective observational study consisting of two parts: a nested case-control study (part A) and a comparative retrospective cohort study (part B).
The study will include ET patients (diagnosed according to "International consensus classification of myeloid neoplasms and acute leukemias - 2022" criteria) who are JAK2V617F positive and have progressed to PV (diagnosed according to "International consensus classification of myeloid neoplasms and acute leukemias - 2022" criteria) by 31/12/2020. The date of PV diagnosis will be defined as the index date and this group of patients will be defined as ET-to-PV cases. Part A - Nested case-control study Controls for ET-to-PV cases will be patients diagnosed with ET, according to the "Internationa…
Inclusion Criteria: \- ET patients (diagnosed according to "International consensus classification of myeloid neoplasms and acute leukemias - 2022" criteria) who are JAK2V617F positive and have progressed to PV (diagnosed according to "International consensus classification of myeloid neoplasms and acute leukemias - 2022" criteria) by 31/12/2020. The date of PV diagnosis will be defined as the index date and this group of patients will be defined as ET-to-PV cases. Exclusion Criteria: * None.