A Study of Anagrelide Controlled Release (GALE-401) in Patients With High Platelet Counts Due to Bone Marrow Disorders

Anagrelide is a drug that has been shown to slow down how fast platelets are made in the bone marrow, and has been approved by the FDA for treating high platelets counts in patients with bone marrow disorders. Anagrelide Controlled Release ("CR") is a new preparation of anagrelide that is made to dissolve more slowly than currently marketed versions of this drug. Because of this, the anagrelide is taken up into the blood more slowly. Researchers think that this slower release of the drug could help to lower side effects that might be caused by high blood levels when the drug dissolves as quickly as it does with the currently marketed product. The main purposes of this study are to see how well Anagrelide CR can control platelet counts in patients with high platelet levels, to see what kind of side effects it causes, and to measure blood levels of the drug.