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Autoimmune lymphoproliferative syndrome (ALPS) is a rare genetic disorder of the immune system that affects both children and adults. In ALPS, unusually high numbers of white blood cells called lymphocytes accumulate in the lymph nodes, liver, and spleen, which can lead to enlargement of these organs. ALPS can cause numerous autoimmune problems such as anemia (low count of red blood cells), thrombocytopenia (low count of platelets), and neutropenia (low count of neutrophils, the most common type of white blood cell in humans).
Last Updated January 13, 2014
Last Reviewed January 13, 2014