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Amyloid Light-chain (AL) amyloidosis, primary systemic amyloidosis (PSA) or just primary amyloidosis is the most common form of systemic amyloidosis in the US.[1] The disease is caused when a person's antibody-producing cells do not function properly and produce abnormal protein fibers made of components of antibodies called light chains. These light chains come together to form amyloid deposits in different organs which can cause serious damage to these organs.[2][3] Abnormal light chains in blood and urine are sometimes referred to as "M-protein" or "Bence Jones protein".
Signs and symptoms AL amyloidosis can affect a wide range of organs, and consequently present with a range of symptoms. Kidney complications are the most commonly cited results of AL amyloidosis. Symptoms of kidney disease and renal failure can include fluid retention, swelling, and shortness of breath.[4] In addition to kidneys, AL amyloidosis may affect the heart, peripheral nervous system, gastrointestinal tract, blood, lungs and skin. Heart compliciations, which affect more than a third of AL patients, include heart failure and irregular heart beat. Other symptoms can include stroke, gastrointestinal disorders, enlarged liver, diminished spleen function, diminished function of the adrenal and other endocrine glands, skin color change or growths, lung problems, bleeding and bruising problems, fatigue and weight loss.[4][5] Causes AL amyloidosis can occur spontaneously, however, it is often associated with other blood disorders, such as multiple myeloma and Waldenstr m's macroglobulinemia.[4] About 10% to 15% of patients with multiple myeloma may develop overt AL amyloidosis.[6] Diagnosis Both blood and the urine can be tested for the light chains, which may form amyloid deposits, causing disease. However, the diagnosis requires a sample of an affected organ.[4][7] Treatment The most effective treatment is autologous bone marrow transplants with stem cell rescues. However many patients are too weak to tolerate this approach.[8][9] Other treatments can involve application of chemotherapy similar to that used in multiple myeloma.[9] A combination of bortezomib and dexamethasone has been proposed,[10] as has melphalan and dexamethasone.[8] Prognosis Median survival for patients diagnosed with AL amyloidosis is 40 months.[11] Epidemiology AL amyloidosis is a rare disease; only 1200 to 3200 new cases are reported each year in the United States. Two thirds of patients with AL amyloidosis are male and less than 5% of patients are under 40 years of age.[4][12] See also References External links
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