{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T21:22:37Z","timestamp":1780089757500,"version":"3.54.0"},"reference-count":41,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2019,8,12]],"date-time":"2019-08-12T00:00:00Z","timestamp":1565568000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Allergy"],"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Patients with clonal mast cell disorders (cMCD), systemic mastocytosis (SM) and monoclonal mast cell activation syndrome (MMAS), represent an increased risk for Hymenoptera venom anaphylaxis (HVA). Lifelong venom immunotherapy (VIT) is recommended; however, its efficacy and safety are controversial. Hence, we sought to evaluate the efficacy and safety of VIT in HVA patients with cMCD.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A retrospective study was conducted among 46 patients with <jats:italic>Vespula<\/jats:italic> venom allergy who had experienced severe HVA, 32 cMCD (22 with SM and 10 with MMAS) and 14 controls. There were no differences between cMCD patients and controls in age (58 vs 66) and duration of VIT (47 vs 48\u00a0months), respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>During VIT, 11 (34%) cMCD patients experienced adverse reactions (ARs) (7% in controls), including 1 anaphylaxis. There were 23 re\u2010stings in 17 (53%) patients during VIT. Of episodes, four (17%) presented with anaphylaxis, 14 (60%) presented with local reaction, and five (23%) were asymptomatic. In 11 episodes (48%), the patient did not take epinephrine, of these 8 (73%) presented with local reaction, and 3 (27%) were asymptomatic. Patient\u2010based protection from anaphylaxis was 76% (4\/17) in cMCD vs. 100% in controls during VIT. The venom\u2010specific IgG4 concentrations increased during VIT (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a0.001) although tryptase and IgE were unaltered.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Both safety and efficacy of VIT in cMCD patients were slightly reduced than controls. Severe ARs were rare. The elevated IgG4 levels may be a biomarker for efficacy of VIT in cMCD patients, as it correlates with protection from re\u2010stings.<\/jats:p><\/jats:sec>","DOI":"10.1111\/all.13980","type":"journal-article","created":{"date-parts":[[2019,7,15]],"date-time":"2019-07-15T20:02:46Z","timestamp":1563220966000},"page":"169-177","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":44,"title":["Venom immunotherapy in patients with clonal mast cell disorders: IgG4 correlates with protection"],"prefix":"10.1111","volume":"75","author":[{"given":"Jesper","family":"Jarkvist","sequence":"first","affiliation":[{"name":"Department of Respiratory Medicine and Allergy Karolinska University Hospital Huddinge Stockholm Sweden"},{"name":"Immunology and Allergy Unit, Department of Medicine Solna Karolinska Institutet, and Karolinska University Hospital Stockholm 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