Questions About Cancer? 1-800-4-CANCER

Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ®)

Patient Version
Last Modified: 10/21/2014

General Information About Plasma Cell Neoplasms



Plasma cell neoplasms are diseases in which the body makes too many plasma cells.

Plasma cells develop from B lymphocytes (B cells), a type of white blood cell that is made in the bone marrow. Normally, when bacteria or viruses enter the body, some of the B cells will change into plasma cells. The plasma cells make antibodies to fight bacteria and viruses, to stop infection and disease.

Enlarge
Blood cell development; drawing shows the steps a blood stem cell goes through to become a red blood cell, platelet, or white blood cell. A myeloid stem cell becomes a red blood cell, a platelet, or a myeloblast, which then becomes a granulocyte (the types of granulocytes are eosinophils, basophils, and neutrophils). A lymphoid stem cell becomes a lymphoblast and then becomes a B lymphocyte, T lymphocyte, or natural killer cell. A B lymphocyte may become a plasma cell.
Blood cell development. A blood stem cell goes through several steps to become a red blood cell, platelet, or white blood cell.


Plasma cell neoplasms are diseases in which abnormal plasma cells or myeloma cells form tumors in the bones or soft tissues of the body. The plasma cells also make an antibody protein, called M protein, that is not needed by the body and does not help fight infection. These antibody proteins build up in the bone marrow and can cause the blood to thicken or can damage the kidneys.

Plasma cell neoplasms can be benign (not cancer) or malignant (cancer).

Monoclonal gammopathy of undetermined significance (MGUS) is not cancer but can become cancer. The following types of plasma cell neoplasms are cancer:

There are several types of plasma cell neoplasms.

Plasma cell neoplasms include the following:

Monoclonal gammopathy of undetermined significance (MGUS)

In this type of plasma cell neoplasm, less than 10% of the bone marrow is made up of abnormal plasma cells and there is no cancer. The abnormal plasma cells make M protein, which is sometimes found during a routine blood or urine test. In most patients, the amount of M protein stays the same and there are no signs, symptoms, or health problems. In some patients, MGUS may later become a more serious condition, such as amyloidosis. It can also become cancer, such as multiple myeloma, lymphoma, or chronic lymphocytic leukemia.

Plasmacytoma

In this type of plasma cell neoplasm, the abnormal plasma cells (myeloma cells) are in one place and form one tumor, called a plasmacytoma. Sometimes plasmacytoma can be cured. There are two types of plasmacytoma.

Signs and symptoms depend on where the tumor is.

  • In bone, the plasmacytoma may cause pain or broken bones.
  • In soft tissue, the tumor may press on nearby areas and cause pain or other problems. For example, a plasmacytoma in the throat can make it hard to swallow.

Multiple myeloma

In multiple myeloma, abnormal plasma cells (myeloma cells) build up in the bone marrow and form tumors in many bones of the body. These tumors may keep the bone marrow from making enough healthy blood cells. Normally, the bone marrow makes stem cells (immature cells) that become three types of mature blood cells:

As the number of myeloma cells increases, fewer red blood cells, white blood cells, and platelets are made. The myeloma cells also damage and weaken the bone.

Sometimes multiple myeloma does not cause any signs or symptoms. It may be found when a blood or urine test is done for another condition. Signs and symptoms may be caused by multiple myeloma or other conditions. Check with your doctor if you have any of the following:

  • Bone pain, especially in the back or ribs.
  • Bones that break easily.
  • Fever for no known reason or frequent infections.
  • Easy bruising or bleeding.
  • Trouble breathing.
  • Weakness of the arms or legs.
  • Feeling very tired.

A tumor can damage the bone and cause hypercalcemia (too much calcium in the blood). This can affect many organs in the body, including the kidneys, nerves, heart, muscles, and digestive tract, and cause serious health problems.

Hypercalcemia may cause the following signs and symptoms:

Multiple myeloma and other plasma cell neoplasms may cause a condition called amyloidosis.

In rare cases, multiple myeloma can cause peripheral nerves (nerves that are not in the brain or spinal cord) and organs to fail. This may be caused by a condition called amyloidosis. Antibody proteins build up and stick together in peripheral nerves and organs, such as the kidney and heart. This can cause the nerves and organs to become stiff and unable to work the way they should.

Amyloidosis may cause the following signs and symptoms:

  • Feeling very tired.
  • Purple spots on the skin.
  • Enlarged tongue.
  • Diarrhea.
  • Swelling caused by fluid in your body's tissues.
  • Tingling or numbness in your legs and feet.

Age can affect the risk of plasma cell neoplasms.

Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your doctor if you think you may be at risk.

Plasma cell neoplasms are most common in people who are middle aged or older. For multiple myeloma and plasmacytoma, other risk factors include the following:

Tests that examine the blood, bone marrow, and urine are used to detect (find) and diagnose multiple myeloma and other plasma cell neoplasms.

The following tests and procedures may be used:

  • Physical exam and history : An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken.

  • Blood and urine immunoglobulin studies: A procedure in which a blood or urine sample is checked to measure the amounts of certain antibodies (immunoglobulins). For multiple myeloma, beta-2-microglobulin, M protein, free light chains, and other proteins made by the myeloma cells are measured. A higher-than-normal amount of these substances can be a sign of disease.

  • Bone marrow aspiration and biopsy : The removal of bone marrow, blood, and a small piece of bone by inserting a hollow needle into the hipbone or breastbone. A pathologist views the bone marrow, blood, and bone under a microscope to look for abnormal cells.
    Enlarge
    Bone marrow aspiration and biopsy; drawing shows a patient lying face down on a table and a Jamshidi needle (a long, hollow needle) being inserted into the hip bone. Inset shows the Jamshidi needle being inserted through the skin into the bone marrow of the hip bone.
    Bone marrow aspiration and biopsy. After a small area of skin is numbed, a Jamshidi needle (a long, hollow needle) is inserted into the patient’s hip bone. Samples of blood, bone, and bone marrow are removed for examination under a microscope.
    The following test may be done on the sample of tissue removed during the bone marrow aspiration and biopsy:

  • Skeletal bone survey: In a skeletal bone survey, x-rays of all the bones in the body are taken. The x-rays are used to find areas where the bone is damaged. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body.

  • Complete blood count (CBC) with differential : A procedure in which a sample of blood is drawn and checked for the following:
    • The number of red blood cells and platelets.
    • The number and type of white blood cells.
    • The amount of hemoglobin (the protein that carries oxygen) in the red blood cells.
    • The portion of the blood sample made up of red blood cells.

  • Blood chemistry studies : A procedure in which a blood sample is checked to measure the amounts of certain substances, such as calcium or albumin, released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it.

  • Twenty-four-hour urine test: A test in which urine is collected for 24 hours to measure the amounts of certain substances. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it. A higher than normal amount of protein may be a sign of multiple myeloma.

  • MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is also called nuclear magnetic resonance imaging (NMRI). An MRI may be used to find areas where the bone is damaged.

Certain factors affect prognosis (chance of recovery) and treatment options.

The prognosis (chance of recovery) depends on the following:

  • The type of plasma cell neoplasm.
  • The stage of the disease.
  • Whether a certain immunoglobulin (antibody) is present.
  • Whether there are certain genetic changes.
  • Whether the kidney is damaged.
  • Whether the cancer responds to initial treatment or recurs (comes back).

Treatment options depend on the following:

  • The type of plasma cell neoplasm.
  • The age and general health of the patient.
  • Whether there are signs, symptoms, or health problems, such as kidney failure or infection, related to the disease.
  • Whether the cancer responds to initial treatment or recurs (comes back).