Study to Identify and Describe Predictive Factors for Thromboembolic Events in Patients With High-risk Polycythemia Vera

Prospective Observational Study to Identify and Describe Predictive Factors for Thromboembolic Events in Patients With High-risk Polycythemia Vera

This is a prospective observational study that will enroll patients with high-risk Polycythemia Vera (PV) with at least one Thromboembolic Event (TE) after diagnosis or up to 2 years prior to diagnosis.

This is a non-randomized study, and to ensure a sufficient number of patients in both cohorts, enrollment in each cohort will be terminated once the target of 150 patients has been reached.

All patients are already on treatment with hydroxyurea or ruxolitinib at enrollment as per clinical practice and independently of their participation in this study. In addition, the follow-up visits and the evaluation procedures required in the study protocol correspond to current clinical practice. According to local regulations related to observational studies, assessments such as blood tests are justified by the purpose and rationale of the study (i.e., the identification of possible predictive factors of TEs) and are considered current clinical practice. Data related to other procedures will be collected only if such procedures are performed as per clinical practice but are not required otherwise.

Patients in both cohorts will be followed for 3 years after enrollment and will have visits at Months 6, 12, 18, 24, 30 and 36. A time window of ± 1 month is permitted for all visits.

Inclusion Criteria:

1. Signed informed consent must be obtained prior to participation in the study.
2. Age ≥18 years.
3. Diagnosis of PV according to WHO 2008 or WHO 2016 and high-risk stratification according to European LeukemiaNet (ELN) classification.
4. At least one TE after diagnosis or up to 2 years prior to diagnosis.
5. Patients on treatment with hydroxyurea at enrollment and for at least 18 months prior to enrollment or those on treatment with ruxolitinib who started treatment up to 18 months before enrollment.