This clinical trial is focused on studying the long-term effects of a treatment called pelabresib in patients with certain blood disorders known as myeloproliferative neoplasms, specifically myelofibrosis and essential thrombocythemia. These conditions involve the abnormal growth of blood cells in the bone marrow, which can lead to various health issues. The treatment being studied, pelabresib, is a type of medication known as a small molecule bromodomain inhibitor, which works by targeting specific proteins involved in the growth of these abnormal cells.
The purpose of this study is to evaluate the long-term safety and potential benefits of pelabresib for patients who have already been receiving this treatment in previous studies. Participants will continue to take pelabresib in the form of a tablet, and their health will be monitored over time to assess any side effects and overall survival. The study will also look at how long patients continue to benefit from the treatment and how it affects their quality of life.
Throughout the study, patients will have regular check-ups to monitor their condition and any changes in their health. The study aims to provide valuable information about the safety and effectiveness of pelabresib for managing myeloproliferative neoplasms, helping to improve treatment options for these conditions in the future.



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