“…As AA may be associated with PNH, detection of the PNH clone is more indicative for AA than any other cause of pancytopenia and bone marrow failure. Although allogeneic hematopoietic stem cell transplantation (allo-HSCT) is considered to be the only curative procedure for patients with severe aplastic anemia (SAA), it is recommended that younger patients, particularly children, undergo careful evaluation of concomitant illnesses and performance status to determine unfit or frail patients before intensive therapies, including allo-HSCT or immunosuppressive therapy (IST) [antithymocyte globulin (ATG) or cyclosporine A (CsA)], due to treatment-related mortality and morbidity [76][77][78]. Figure 1 shows a practical therapeutic algorithm in SAA [European Group for Blood and Marrow Transplantation (EBMT) algorithm for SAA in 2019, modified] [5].…”