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Multiple myeloma

  • Definition
    • Multiple myeloma is a blood cancer that starts in the plasma cells in the bone marrow. Bone marrow is the soft, spongy tissue found inside most bones. It helps make blood cells.

      Plasma cells help your body fight infection by producing proteins called antibodies. With multiple myeloma, plasma cells grow out of control in the bone marrow and form tumors in the areas of solid bone. The growth of these bone tumors weakens the solid bones. It also makes it harder for the bone marrow to make healthy blood cells and platelets.

  • Alternative Names
    • Plasma cell dyscrasia; Plasma cell myeloma; Malignant plasmacytoma; Plasmacytoma of bone; Myeloma - multiple

  • Causes
    • The cause of multiple myeloma is unknown. Past treatment with radiation therapy increases the risk for this type of cancer. Multiple myeloma mainly affects older adults.

  • Symptoms
    • Multiple myeloma most commonly causes:

      • Low red blood cell count (anemia), which can lead to fatigue and shortness of breath
      • Low white blood cell count, which makes you more likely to get infections
      • Low platelet count, which can lead to abnormal bleeding

      As the cancer cells grow in the bone marrow, you may have bone pain, most often in the ribs or back.

      The cancer cells can weaken bones. As a result:

      • You may develop broken bones (bone fractures) just from doing normal activities.
      • If cancer grows in the spine bones, it can press on the nerves. This can lead to numbness or weakness of the arms or legs.
  • Exams and Tests
  • Treatment
    • People who have mild disease or in whom the diagnosis is not certain are usually closely monitored. Some people have a form of multiple myeloma that grows slowly (smoldering myeloma), which takes years to cause symptoms.

      Various types of medicines are used to treat multiple myeloma. They are most often given to prevent complications such as bone fractures and kidney damage.

      Radiation therapy may be used to relieve bone pain or to shrink a tumor that is pushing on the spinal cord.

      Two types of bone marrow transplants may be used:

      • Autologous bone marrow or stem cell transplantation is performed using a person's own stem cells.
      • Allogeneic transplant uses someone else's stem cells. This treatment has serious risks, but may offer the chance of a cure.

      You and your healthcare provider may need to manage other concerns during your treatment, including:

  • Support Groups
    • You can ease the stress of illness by joining a cancer support group. Sharing with others who have common experiences and problems can help you not feel alone.

  • Outlook (Prognosis)
    • Outlook depends on the person's age and the stage of disease. In some cases, the disease progresses very rapidly. In other cases, it takes years for symptoms to appear.

      In general, multiple myeloma is treatable, but only in rare cases can it be cured.

  • Possible Complications
    • Kidney failure is a frequent complication. Others may include:

      • Bone fractures
      • High level of calcium in the blood, which can be very dangerous
      • Increased chances for infection, especially in the lungs
      • Weakness or loss of movement due to tumor pressing on spinal cord
  • When to Contact a Medical Professional
    • Call your doctor if you have multiple myeloma and you develop an infection, or numbness, loss of movement, or loss of sensation.

  • References
    • National Cancer Institute: PDQ plasma cell neoplasms (including multiple myeloma) treatment. Bethesda, MD: National Cancer Institute. Updated February 6, 2016. www.cancer.gov/cancertopics/pdq/treatment/myeloma/healthprofessional. Accessed March 17, 2016.

      National Comprehensive Cancer Network. NCCN clinical practice guidelines in oncology: multiple myeloma. Version 3.2016. www.nccn.org/professionals/physician_gls/pdf/myeloma.pdf. Accessed March 17, 2016.

      Rajkumar SV, Dispenzieri A. Multiple myeloma and related disorders. In: Niederhuber JE, Armitage JO, Doroshow JH, Kastan MB, Tepper JE, eds. Abeloff's Clinical Oncology. 5th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 104.