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Omalizumab in Severe Asthma: Effect on Oral Corticosteroid Exposure and Remodeling. A Randomized Open-Label Parallel Study

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Abstract

Introduction

Data on the clinical efficacy and remodeling of omalizumab therapy in patients on oral corticosteroids (OC) are limited.

Objective

The purpose of the study is to show that in patients with corticosteroid-dependent asthma, omalizumab is a corticosteroid-sparing therapy able to inhibit airway remodeling and to reduce disease burden (lung function impairment, exacerbations).

Methods

This study is a randomised open-label study evaluating the addition of omalizumab to the standard of care in patients with severe asthma receiving oral corticosteroids. The primary endpoint was represented by the change in OC monthly dose by the end of treatment and secondary endpoints included spirometry changes, airway inflammation (FeNO), number of exacerbations and airways remodelling assessed by bronchial biopsies studied by transmission electron microscopy. As a safety variable, adverse effects were recorded.

Results

Efficacy was assessed for 16 patients in the omalizumab group and 13 in the control group. The final cumulative mean monthly OC doses were 34.7 mg and 217 mg for the omalizumab and control group, respectively; the mean difference between groups adjusted for baseline was −148.1 [95% confidence interval (CI) −243.6, −52.5; p = 0.004]. OC withdrawal of 75% versus 7.7% (p = 0.001) was observed in the omalizumab and control group, respectively. Omalizumab provided a slowing of forced expiratory volume in one second (FEV1) loss (70 mL versus 260 mL), a significant decrease in FeNO values and a reduction in the annual relative risk of clinically significant exacerbations of 54%. The treatment was well tolerated. The morphological study showed a significant decrease in basement membrane thickness in the omalizumab group (6.7 µm versus 4.6 µm) compared with controls (6.9 µm versus 7 µm) [mean difference between groups adjusted for baseline was −2.4 (95% CI −3.7, −1.2; p < 0.001], as well as a decrease in intercellular spaces (1.18 µm versus 0.62 µm and 1.21 µm versus 1.20 µm, p = 0.011, respectively). A qualitative improvement was also observed in the treated group.

Conclusions

Omalizumab showed a marked OC-sparing capacity and was associated with an improvement in clinical management that correlated with bronchial epithelial repair. In OC-dependent asthma, reversibility of remodelling is possible; the concepts that basement membrane enlargement is detrimental and that chronic airway obstruction is systematically irreversible are outdated (EudraCT: 2009-010914-31).

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Acknowledgements

We thank Anna Garrit for her technical assistance in electron microscopy laboratory (Department of Morphological Sciences-UAB), Natàlia Martínez, nurse at the Respiratory Service (Corporació Parc Taulí-UAB) and Dr. Vicente Marco-Molina (Servei d’Anatomía Patològica, Hospital Quirón, Barcelona).

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Correspondence to Christian Domingo.

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Funding

Grants from SEPAR 845-2009/ FUCAP 2008/FUCAP 2009.

Conflicts of Interest

C.D. declares having received financial aid for travel support and speakers bureaus from Novartis, Sanofi, GSK, TEVA, MSD, Esteve, Almirall, Astra-Zeneca, Chiesi, Menarini, Pfizer, Ferrer, Stallergenes, ALK-Abelló, Allergy therapeutics, Hall Allergy, Inmunotek and Roxall. R.M.M., C.F. and F.G. declare that they have no conflicts of interest. No authors have any conflict of interest in relation to this study.

Availability of data and material

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Ethics approval

The study was approved by the Institutional Review Boards of both hospitals. Written informed consent was obtained from all patients. The study was registered with EudraCT number 2009-010914-31. The study was performed in accordance with the ethical standards of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

Consent to participate

Written informed consent was obtained from all patients.

Consent for publication

Written informed consent was obtained from all patients.

Authors’ contributions

C.D.: conceptualization, funding acquisition, data curation, methodology, project administration, resources, supervision, verification, visualization and writing original draft. R.M.M: conceptualization, data curation, methodology, resources, supervision, verification, visualization and writing original draft. F.J.G.B.: data curation, resources, verification and writing—review and editing. C.F.: formal analysis, methodology, visualization and writing—review and editing. F.P.: data curation, resources, verification and writing—review and editing. All authors have read and approved the final version of the manuscript, and agree to be accountable for the work.

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Domingo, C., Mirapeix, R.M., González-Barcala, FJ. et al. Omalizumab in Severe Asthma: Effect on Oral Corticosteroid Exposure and Remodeling. A Randomized Open-Label Parallel Study. Drugs 83, 1111–1123 (2023). https://doi.org/10.1007/s40265-023-01905-5

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