(Amyloid; Primary Amyloid; Secondary Amyloid; Hereditary Amyloid)
Amyloidosis is a group of rare diseases. It involves deposits of a protein called amyloid. These proteins build up in body tissues and organs. There are three major forms:
- Primary amyloidosis—found in the heart, lungs, skin, tongue, thyroid gland, intestines, liver, kidneys, and blood vessels
- Secondary amyloidosis—found in the spleen, liver, kidneys, adrenal glands, and lymph nodes
- Hereditary amyloidosis—found in the nerves, heart, blood vessels, and kidneys
The causes of amyloidosis vary in its different forms:
Primary amyloidosis—caused by the deposit of antibody fragments; associated with bone marrow disorders such as
- Secondary amyloidosis—develops in response to chronic infection or inflammatory disease
- Hereditary amyloidosis—caused by mutations of amyloid in the blood
Men older than 40 are at increased risk for primary and secondary amyloidosis. People who are of Portuguese, Swedish, or Japanese descent are at increased risk for hereditary amyloidosis.
Factors that may increase your risk of getting amyloidosis include:
- Family history of amyloidosis
- Family history of Mediterranean fever
Symptoms for all forms of amyloidosis include:
The extent of the disease and the type of organ affected determine the symptoms. Symptoms can vary from mild to severe. The following is a list of additional symptoms as they relate to specific body systems:
- Skin—easy bruising, purplish skin around the eyes caused by small blood vessels leaking into the skin
- Lymphatic system—enlarged lymph nodes
- Endocrine system—enlarged thyroid gland
- Swallowing difficulties
- Enlarged tongue
- Clay colored stools
- Numbness, tingling, weakness in hands and feet
- Swelling of nerves in the wrist
- Weak hand grip
Cardiovascular system—Irregular heart beat
- Difficulty breathing
- Shortness of breath
|Edema in Lower Legs
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You will be asked about your symptoms and medical history. A physical exam will be done. The doctor may refer you to specialists.
Your bodily fluids and tissues may be tested. This can be done with:
Images may be taken of your bodily structures. This can be done with:
Your nerves may be examined. This can be done with nerve conduction velocity.
There is no cure for any form of this disease. The main goal is to treat an underlying condition. Treatment to decrease or control symptoms and complications has been only slightly successful. Talk with your doctor about the best plan for you. Treatment options include:
is the use of a series of drugs. It may be given by pill, injection, or via a catheter. In this case, it is used to help improve symptoms and slow the progression of the disease by interrupting the growth of the abnormal cells that produce amyloid protein. It is used in:
- Primary amyloidosis
- Secondary amyloidosis—an aggressive treatment of the underlying inflammatory process or disease
- Hereditary amyloidodis
Stem Cell Transplantation
Stem cells are immature cells. They are
to replace damaged or diseased cells. This process is used in:
- Primary amyloidodis—Your own immature blood cells are transfused. This process is called autologous stem cell transplant. Medications, like chemotherapy drugs, may be used with this treatment.
- Hereditary amyloidodis—Cells are transplanted from a donor body
This is the removal of a diseased organ and transfer of a healthy donor organ to the recipient. In these cases, it is the liver or kidney. It may be done in all major forms of amyloidosis. In the case of hereditary amyloidosis, it may stop the progression of the disease.
This is the
removal of the spleen
. This can decrease the production of amyloid. It may be done for primary and secondary amyloidodis.
Treatments for All Forms of Amyloidosis
Treatments for all forms of amyloidosis include:
- Medications—such as diuretics to rid your body of excess fluid and steroids to relieve inflammation
- Dietary changes—The diet chosen will depend on the organ affected and related complications
- Hospice—Treatment to relieve pain and suffering from progressively fatal complications
There is no known way to prevent amyloidosis.
Office of Rare Diseases Research—National Institutes of Health
Canadian Organization for Rare Disorders
The Kidney Foundation of Canada
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Amyloid: toward terminology clarification.
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What is amyloidosis? Boston University website. Available at:
http://www.bu.edu/amyloid/about/what/. Accessed August 19, 2014.