Suboptimal response to biologics in severe asthma - a marker of humoral immunodeficiencies

Background Asthmatic patients with antibody deficiencies (AD) have more severe disease and higher risk of exacerbations. No data exists about the efficacy of biologics in severe asthma (SA) patients with AD.The objective of this study was to evaluate the efficacy of biologics in SA patients with and without AD. Methods A case-control real-life study was conducted including 68 patients divided in two groups: group 1 with SA-AD and group 2 with SA. Results Treatment by biologics for 6 months was effective to decrease the number of exacerbations, hospitalizations, and emergency department (ED) visits, to improve the Asthma Control Questionnaire (ACQ) score and proved a systemic corticosteroid sparing effect. Despite benefits, the number of exacerbations, hospitalizations, and ED visits, the mean ACQ score, and the cumulative dose of systemic corticosteroids remain higher in group 1 vs 2, with lower lung function parameters. The rates of responses were inferior in group 1 vs 2 with a decrease by ≥50% of exacerbation rate in 76% vs 97% of patients (p=.006), no hospitalization in 44% vs 91% of patients (p<.001), no ED visit 56% vs 82% of patients (p=.018), significant improvement of ACQ score by ≥0.5 in 68% vs 100% of patients (p<.001), and increase of forced expiratory volume in the first second by >10% in 32% vs 65% of patients (p=.007). Conclusion Despite evident benefits, SA patients with AD have suboptimal responses to biologics compared to those immunocompetent. A multidisciplinary approach is necessary to optimize the management of these patients in practice.