alexa Evaluation of serum s-IgE total IgE ratio in predicting clinical response to allergen-specific immunotherapy.
Immunology

Immunology

Immunotherapy: Open Access

Author(s): Di Lorenzo G, Mansueto P, Pacor ML, Rizzo M, Castello F,

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Abstract BACKGROUND: To date, no predictive tests for the clinical response to allergen-specific immunotherapy (ASI) are available. Therefore an in vivo or in vitro test would be of great value. OBJECTIVE: We sought to evaluate pretreatment parameters used in diagnosing allergic rhinitis and determining serum specific IgE (s-IgE) levels, serum total IgE (t-IgE) levels, and blood eosinophil counts and to identify whether can be used to predict clinical improvement in monosensitized patients with allergic rhinitis with or without asthma treated with immunotherapy. METHODS: We analyzed 279 patients who had undergone 4 years of ASI administered either by means of the subcutaneous immunotherapy (76 patients) or sublingual immunotherapy (203 patients) routes. Serum t-IgE and s-IgE levels, blood eosinophil counts, and serum s-IgE/t-IgE ratios were calculated and tested for correlation with clinical response to ASI. Receiver operating characteristic curves were determined. Predicted probabilities and predictive areas under the curve were calculated. RESULTS: The clinical response to ASI was effective in 145 (52.0\%) of 279 total patients, 42 (55.2\%) of 76 patients treated with subcutaneous immunotherapy, and 103 (50.7\%) of 203 patients treated with sublingual immunotherapy. A significant correlation was found between the serum s-IgE/t-IgE ratio and the clinical response to ASI, with high ratios (>16.2) associated with an effective response. The sensitivity and specificity of the area under the curve of the ratio were higher than those of serum s-IgE and t-IgE alone. CONCLUSION: The calculation of the serum s-IgE/t-IgE ratio for predicting the clinical response to ASI offers an advantage over measuring t-IgE and s-IgE levels in monosensitized patients for the following allergens: grass, Parietaria judaica, Olea europea, and house dust mite. This article was published in J Allergy Clin Immunol and referenced in Immunotherapy: Open Access

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