The use of the anti‐malaria drug Fansidar® (pyrimethamine and sulphadoxine) in the treatment of a patient with autoimmune lymphoproliferative syndrome and Fas deficiency

Fas is a protein that plays a major role in the apoptotic mechanism of several cell types, including white blood cells (WBC). Mutations of the Fas gene in humans are known to lead to autoimmune lymphoproliferative syndrome (ALPS). Glucocorticoids or cytostatic drugs are sometimes used to treat the lymphoproliferation in these patients. When treated with the anti-malaria drug Fansidar, a patient with ALPS showed a marked shrinkage of the lymph node masses, decrease in peripheral blood lymphocytes (PBL) and an increase in neutrophil numbers. In addition, an increased Fas expression was seen on all types of leucocytes.