RT Journal Article SR Electronic T1 Omalizumab, airway obstruction and remodeling JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP PA4901 DO 10.1183/13993003.congress-2016.PA4901 VO 48 IS suppl 60 A1 Bellocchia, Michela Maria A1 Ambrosanio, Renza A1 Patrucco, Filippo A1 Verri, Giulia A1 Mercante, Lorena A1 Boita, Monica A1 Tabbbia, Giuseppe A1 Mattei, Alessio A1 Solidoro, Paolo A1 Bucca, Caterina YR 2016 UL http://erj.ersjournals.com/content/48/suppl_60/PA4901.abstract AB There is evidence that IgE are implicated in the development of airway remodeling and that it may be attenuated by treatment with anti-IgE omalizumab. We evaluated the effect of omalizumab on airway obstruction, assuming persistent normalization of FEV1 as a marker of remodeling amelioration.Methods- In 24 patients with severe allergic asthma and FEV1 < 80% predicted, 17 women and 7 men, mean age 57 years (range 38-75), we evaluated the median value of FEV1, FeNO, ACT and number of exacerbations (AE) one year before and after omalizumab treatment for six months,1 yr (19 pts), and 2 years (12). Patients were divided into two groups: G1 showing persistent FEV1 normalization after omalizumab and G2 with persistent airway obstruction.Results- Before treatment, G1 and G2 did not differ by FEV1 (63 vs 58 %), total IgE (477 vs 290 UI/L), ACT (15 vs 17) and AE (4.4 vs 4). G1 had significantly higher FENO (73 vs 22 ppb) and eosinophils (0.854 vs 0.348 10^9/L). During treatment, there was a significant increase in ACT, and decrease in AE number in both groups, already evident after 6months. By contrast, FENO and FEV1 and improved only in G1, FEV1 remaining persistently normal, see figure.Conclusions- Our findings support the hypothesis that omalizumab attenuates airway inflammation and remodeling, acting in the first few months of therapy. This effect can be expected in patients with high FENO and eosinophilia before treatment.