Article
Author: Vijayadurai, Pavaladurai ; Eren, Efrem ; Garcez, Tomaz ; Morsi, Hadeil ; Stroud, Catherine ; Drewe, Elizabeth ; Chopra, Charu ; Abdelhakam, Intisar ; Kiani-Alikhan, Sorena ; Frleta-Gilchrist, Marina ; Grammatikos, Alexandros ; Townsend, Katie ; Price, Arthur ; Alachkar, Hana ; Ghanta, Harichandana ; Murng, Sai Hurng Kham ; Whyte, Andrew F ; Sivadasan, Anju ; Denness, Sarah ; Moon, Emily ; Elkhalifa, Shuayb ; Ahuja, Manisha ; Boulton, Anne Pacita Rosillo ; Prasinou, Maria ; Zinser, Emily ; Anantharachagan, Ariharan ; Zhang, Michael ; Sargur, Ravishankar ; Drinkwater, Sara ; Steele, Cathal ; El-Shanawany, Tariq ; Herwadkar, Archana ; Arnold, Dilani ; Coulter, Tania I ; Herriot, Richard ; Jain, Rashmi ; Bourne, Helen ; Yong, Patrick F K ; Huissoon, Aarnoud ; Thomas, Moira ; Sooriyakumar, Kavitha ; Dziadzio, Magdalena ; Ekbote, Anjali ; Yellon, Robert L ; Hayman, Grant ; Vaitla, Prashantha Madhuri ; Dempster, John ; Rahman, Tasneem ; Lorenzo, Lorena ; Savic, Sinisa ; Cleave, Elizabeth ; Manson, Ania ; Denman, Sarah
Background:Acquired angioedema due to C1-inhibitor deficiency (AAE-C1-INH) is very rare compared to its prototype, hereditary angioedema. An updated characterization of the AAE-C1-INH cohort in the UK is required to inform management.
Objectives:To describe the disease burden of AAE-C1-INH, long-term prophylaxis (LTP) and the clinical, immunochemical, and treatment profiles of AAE-associated diseases in the UK.
Method:Retrospective data on 117 AAE-C1-INH patients were collected using a national survey proforma across 25/34 Adult Clinical Immunology and Allergy centres in the UK. Other European cohorts were compared.
Results:The median age at AAE-C1-INH diagnosis was 65 years with 3.4% of patients diagnosed below 40 years. The median delay in diagnosis was 1 year. Antifibrinolytics and attenuated androgens showed comparable efficacy to LTP, at 88.9% and 89.5%, respectively. A haematological disorder was identified in 83.8% of AAE-C1-INH patients compared to 3.4% of autoimmune diseases. The predominant haematological disorders were splenic marginal zone lymphoma 34% followed by MGUS 16%. The severity of angioedema did not depend on the associated disease. Anti-C1INH-autoantibodies testing was limited to 23.1%. Rituximab monotherapy was effective in treating 9/9 splenic marginal zone lymphoma and 1/2 MGUS-associated AAE-C1-INH. Rituximab efficacy was independent of anti-C1INH-autoantibodies detection with response in 3/3 seronegative and 4/4 seropositive patients.
Conclusion:The diagnosis of AAE-C1-INH should not be overlooked below the age of 40 years. The choice of oral LTP should be informed by the propensity to side effects. B cell depletion could be considered in treating monoclonal B cell disorder-associated-AAE-C1-INH in the absence of haematological indications. Further studies are required to address the clinical utility of anti-C1INH-autoantibodies.