Search

but robust approach towards the identification of markers that enable the prediction of the outcome of oral immunotherapy for cow’s milk allergy. By means of ELISA, the authors determined specific IgE, IgA, IgG subclass levels against cow’s milk extract, natural single cow’s milk allergens and the egg allergen ovalbumin in 40 children with cow’s milk allergy before and after immunotherapy. Seventy-six children with no history of cow’s milk allergy and 56 children who recovered spontaneously from their milk allergy served as a reference. The researchers found differences in antibody levels between groups and concluded that high levels of cow’s milk-specific IgE, IgA and IgG before immunotherapy may be good indicators for the failure of tolerance, similar to constant IgA and IgE levels during immunotherapy. The course of IgE levels during therapy has been described differently in different articles; some studies observed that levels of IgE remained constant whereas others noticed a decrease or increase. A clearer picture is reported for allergen-specific IgG 4 levels: low cow’s milk-specific IgG 4 levels indicate a persistent allergy and also a negative outcome of oral immunotherapy. The role of IgA during tolerance development has been investigated less and needs to be studied in more detail. The importance of Savilahti et al.’s [6] article is the topic of the study, the search for objective markers which can be easily evaluated during the course of an immunotherapy and help to predict the outcome. Allergen-specifCow’s milk allergy strongly affects the quality of life of patients and their families and the only specific and causative treatment besides avoidance is specific immunotherapy (SIT). However, SIT must be performed over a long period, is often accompanied by severe side effects and its success rate is affected by a variety of factors, among them the patient’s compliance. Quite often, patients treated with SIT are not properly selected and monitored during therapy. The monitoring of the effects of SIT, especially the immunological parameters, may provide useful information regarding the continuation or discontinuation of treatment. Diagnostic surrogate markers for the prediction of the outcome of immunotherapy are still missing and badly needed. Several rather cumbersome approaches towards suitable markers have been pursued. Complex gene expression profiles, in the case of venom immunotherapy [1] , and impaired pulmonary function in conjunction with age, in the case of house dust mite immunotherapy, have been used as indicators for a lower success rate [2] . Other markers include the reduction of allergen-specific T cell proliferation, shown in sublingual immunotherapy studies involving birch pollen [3] and house dust mite [4] . Ideally, the use of biomarkers should already be possible during treatment, in order to predict the outcome [5] . The article by Savilahti et al. [6] in International Archives of Allergy and Immunology is a rather conservative Published online: July 10, 2014