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    Chronic Myeloproliferative Neoplasms Treatment (PDQ®): Treatment - Patient Information [NCI] - Primary Myelofibrosis

    Primary myelofibrosis is a disease in which abnormal blood cells and fibers build up inside the bone marrow.

    The bone marrow is made of tissues that make blood cells (red blood cells, white blood cells, and platelets) and a web of fibers that support the blood-forming tissues. In primary myelofibrosis (also called chronic idiopathic myelofibrosis), large numbers of blood stem cells become blood cells that do not mature properly (blasts). The web of fibers inside the bone marrow also becomes very thick (like scar tissue) and slows the blood-forming tissue's ability to make blood cells. This causes the blood-forming tissues to make fewer and fewer blood cells. In order to make up for the low number of blood cells made in the bone marrow, the liver and spleen begin to make the blood cells.

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    Symptoms of primary myelofibrosis include pain below the ribs on the left side and feeling very tired.

    Primary myelofibrosis often does not cause early signs or symptoms. It may be found during a routine blood test. Signs and symptoms may be caused by primary myelofibrosis or by other conditions. Check with your doctor if you have any of the following:

    • Feeling pain or fullness below the ribs on the left side.
    • Feeling full sooner than normal when eating.
    • Feeling very tired.
    • Shortness of breath.
    • Easy bruising or bleeding.
    • Petechiae (flat, red, pinpoint spots under the skin that are caused by bleeding).
    • Fever.
    • Night sweats.
    • Weight loss.

    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.
    • The number of blasts in the blood.
    • Whether there are certain changes in the chromosomes.
    • Whether the patient has signs such as fever, night sweats, or weight loss.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Public Information from the National Cancer Institute

    Last Updated: May 28, 2015
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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