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Anaphylactoid reactions in two patients after omalizumab administration after successful long-term therapy

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Anti-IgE therapy with omalizumab, a recombinant humanized monoclonal antibody, has anti-inflammatory effects in allergic asthma and rhinitis. Although omalizumab has been exceptionally safe, reactions after its administration have been reported. The goal of this study was to assess two patients who experienced apparent anaphylaxis after omalizumab administration. Two cases of apparent anaphylaxis after omalizumab administration are reported with diagnostic evaluation using skin testing and unique IgE and IgG anti–omalizumab serological assays. At the time of evaluation, both atopic asthmatic patients had total (free and bound) serum IgE levels of 199 kIU/L (100% free) and 200 kIU/L (80% free and 20% bound), respectively. Epicutaneous skin tests to omalizumab were negative at 150 mg/mL of omalizumab in both subjects and the nonexposed negative control subject. Intradermal skin tests were positive at 0.15 mg/mL in subject 1 and negative at 1.5 mg/mL of omalizumab in subject 2 and the control subject. Intradermal testing to polysorbate produced significant wheal/flare reaction in subject 2 but not in the negative control subject. Serological assays for IgE or IgG antibodies reactive with omalizumab were negative. The in vitro and in vivo immunologic data support the conclusion that the adverse reactions experienced by two patients after omalizumab administration after more than a year of successful omalizumab therapy for asthma were likely anaphylactoid in nature. Polysorbate, an excipient in omalizumab, is known to cause similar reactivity to other medicines and is the most likely cause of these reactions.

Keywords: Anaphylaxis; IgE anti-omalizumab; IgG anti-omalizumab; asthma; epicutaneous skin testing; free total IgE; intradermal skin testing; omalizumab; polysorbate; serology

Document Type: Research Article


Affiliations: 1: From the Allergy, Asthma & Dermatology Associates, Portland, Oregon, and 2: Johns Hopkins University School of Medicine, Baltimore, Maryland

Publication date: 2007-05-01

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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