Below is an instruction from Human. Write a response.
    ### Instruction:
    What is the outlook for Primary Myelofibrosis ?
    ### Response:
    Certain factors affect prognosis (chance of recovery) and treatment options for primary myelofibrosis. Prognosis (chance of recovery) depends on the following:         - The age of the patient.    - The number of abnormal red blood cells and white blood cells.
    