Evans syndrome

The symptoms of Evans syndrome vary between patients depending on which blood cells are affected. If red blood cells are attacked, symptoms may include weakness and fatigue, paleness or jaundice, shortness of breath, lightheadedness, and/or a fast heartbeat. If platelets are attacked, symptoms may include increased bruising, prolonged nosebleeds, increased bleeding from minor cuts, and/or Petechiae. In the less common instance that white blood cells are attacked, symptoms may include increased proneness to infection, fevers, and/or mouth sores. It has been variously reported that between 7.8% of patients who have autoimmune hemolytic anemia, will also have thrombocytopenia and thus Evans syndrome. The two cytopenias may occur together or sequentially. ==Causes==

Although Evans syndrome seems to be a disorder of immune regulation, the exact pathophysiology is unknown, but a gradual loss of self-tolerance is postulated. ==Diagnosis==

Diagnosis of Evans syndrome is separated into primary and secondary presentation. There is no single test to confirm a diagnosis of either form of Evans syndrome. It is instead a diagnosis made after a thorough clinical history, documentation of common symptoms, clinical evaluation, and exclusion of all other possible conditions. In 27% to 50% of cases there is an associated malignancy or a predisposing autoimmune disease. Pre-existing autoimmune diseases can include autoimmune lymphoproliferative syndrome (ALPS), combined variable immunodeficiency (CVID), systemic autoimmune disease, or another disorder of immune dysregulation. Other antibodies may occur directed against neutrophils and lymphocytes, and "immunopancytopenia" has been suggested as an alternative term for this syndrome. ==Treatment==

Initial treatment is with glucocorticoid corticosteroids or intravenous immunoglobulin, a treatment that is also used in ITP cases.  In children, it can remain well controlled with a long term immunosuppressant therapy that will occasionally lead to a spontaneous complete resolution of the condition.  Although the majority of cases initially respond well to treatment, relapses are not uncommon mycophenolate mofetil, vincristine and danazol) are subsequently used, The off-label use of rituximab (trade name Rituxan) has produced some good results in acute and refractory cases, although further relapse may occur within a year. but relapses are not uncommon. The only prospect for a permanent cure is the high-risk option of an allogeneic hematopoietic stem cell transplantation (SCT). ==Prognosis==

In a nationwide study of Evans syndrome the median survival was 7.2 years (primary Evans syndrome: 10.9 years; secondary Evans syndrome: 1.7 years). Secondary Evans syndrome was associated with higher mortality rate than primary Evans syndrome, with a five-year survival of 38%. Among patients with Evans syndrome, the prevailing causes of death were bleeding, infections, and hematological cancer. It has been observed that there is a risk of developing other autoimmune problems and hypogammaglobulinemia, in one cohort 58% of children with Evans syndrome had CD4-/CD8- T cells which is a strong predictor for having autoimmune lymphoproliferative syndrome. ==Epidemiology==

Evans syndrome is considered a very rare autoimmune disease. Only one study has estimated incidence and prevalence adults. In Denmark in 2016 the annual incidence was 1.8 per 1,000,000 person years, and the prevalence was 21.3 per 1,000,000 living persons. ==See also==