Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the treatments for Primary Myelofibrosis ?
    ### Response:
    Treatment of primary myelofibrosis in patients without signs or symptoms is usually watchful waiting.    Patients with primary myelofibrosis may have signs or symptoms of anemia. Anemia is usually treated with transfusion of red blood cells to relieve symptoms and improve quality of life.
    