No abstract

The effects of an immunoadsorption procedure, specifically designed to remove immunoglobulin E (IgE), on food-induced anaphylaxis have never been evaluated. We evaluate the effects of IgE removal on the allergic thresholds to foods. A 6-year-old boy with anaphylaxis to multiple foods and steroid-resistant unstable allergic asthma displayed serum IgE levels of 2800 to 3500 kU/L. To lower IgE serum concentrations, which could be overridden by a high dose of omalizumab, 1.5 plasma volumes were exchanged in 8 apheresis sessions. During the procedure, serum IgE levels fell to 309 kU/L. After the procedure, the threshold of reactivity to baked milk increased from 0.125 to 5 g of milk protein (full tolerance) after the first session, and the threshold of reactivity to hazelnut increased from 0.037 to 0.142 g of protein after the first session, 0.377 g after the eighth, and 1.067 g (full tolerance) after the first administration of omalizumab. Immediately after the sixth IgE immunoadsorption, we started omalizumab therapy. In the next 40 days, the threshold of reactivity to hazelnut increased to 7.730 (full tolerance). Asthma control was obtained, treatment with montelukast was stopped, and fluticasone was tapered from 500 to 175 μg/day. The boy became partially or fully tolerant to all the tested foods, and quality of life was improved. IgE immunoadsorption, used to establish the starting basis for omalizumab administration, is able to increase the tolerance threshold to foods.