The primary objective of this non interventional study is to evaluate symptom burden in adult patients with PV without symptomatic splenomegaly during treatment with ropeginterferon alfa-2b in a real-world setting. Further patient-relevant endpoints include effectiveness including complete hematologic response (CHR), event-free survival (EFS), safety and tolerability, treatment reality including dosing details as well as factors affecting treatment decision making.
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Symptom Burden
Timeframe: From Time of enrollment until month 36.