NCIt synonyms : Type 3 ALPS; ALPS-U; Autoimmune Lymphoproliferative Syndrome-Undetermined variant; ALPS-Unknown Underlying Mutation; Type 3 Autoimmune Lymphoproliferative Syndrome; Autoimmune Lymphoproliferative Syndrome with Unknown Underlying Mutation;
NCIt definition : A rare, primary immunodeficiency. It is caused by a currently undetermined defect
in the Fas-induced apoptosis pathway. No mutations in Fas, FASLG or CASP10 are detectable.
Disruption of Fas-induced apoptosis impairs lymphocyte homeostasis and immune tolerance.
Characteristic laboratory findings include an increase in circulating, double-negative
(CD4-/CD8-) T cells in the setting of immune-mediated anemia, thrombocytopenia and
neutropenia. Clinical signs present in childhood include fatigue, pallor, bruising,
hepatosplenomegaly and chronic, non-malignant, non-infectious lymphadenopathy. The
clinical course is influenced by a strong association with other autoimmune disorders
and an increased risk for developing Hodgkin and non-Hodgkin lymphoma.;