Thrombocythemia 1, also known as thrombocytosis 1, is related to polycythemia and polycythemia vera. An important gene associated with Thrombocythemia 1 is THPO (Thrombopoietin), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Visual Cycle in Retinal Rods. The drugs Benzocaine and Anagrelide have been mentioned in the context of this disorder. Affiliated tissues include bone marrow and myeloid, and related phenotypes are thrombocytosis and impaired adp-induced platelet aggregation