<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A rare, X-linked immunodeficiency syndrome characterized by eczema, thrombocytopenic purpura, and recurrent pyogenic infection. It is seen exclusively in young boys. Typically, IMMUNOGLOBULIN M levels are low and IMMUNOGLOBULIN A and IMMUNOGLOBULIN E levels are elevated. Lymphoreticular malignancies are common.</n0:def-definition><n0:def-source>MSH2003_2003_05_12</n0:def-source></n0:ComplexDefinition><n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>An inherited immune disorder that occurs in young boys. It causes eczema (a type of skin inflammation), a decrease in the number of platelets (blood cells that help prevent bleeding), and frequent bacterial infections. People with Wiskott-Aldrich syndrome are at increased risk of developing leukemia and lymphoma.</n0:def-definition><n0:def-source>NCI-GLOSS</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A rare, X-linked immunodeficiency syndrome characterized by eczema, thrombocytopenia, and recurrent pyogenic infection. It is seen exclusively in young boys. Typically, IgM levels are low and IgA and IgE levels are elevated. Lymphoreticular malignancies are common.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>