Long-Term Treatment With Anti-Interleukin 5 Antibodies in a Patient with Chronic Eosinophilic Pneumonia

Monoclonal antibodies in idiopathic chronic eosinophilic pneumonia: a scoping review

BACKGROUND

Idiopathic chronic eosinophilic pneumonia (ICEP) is a rare disease characterized by pulmonary radiological alterations, peripheral eosinophilia, and demonstrated pulmonary eosinophilia. Oral steroids (OSs) are the standard management, but relapses occur in up to 50% of patients during the decrease or suspension of steroids, usually requiring reinitiation of treatment, exposing patients to secondary events derived from the management. Management with monoclonal antibodies has been proposed in these cases to control the disease and limit the secondary effects. The objective is to describe the extent and type of evidence regarding the use of monoclonal antibodies for ICEP.

METHODS

A panoramic review of the literature was performed. Observational and experimental studies of pediatric and adult populations that managed recurrent ICEP with monoclonal antibodies were included. Data search, selection, and extraction were performed by two independent reviewers.

RESULTS

937 studies were found. After applying the inclusion and exclusion criteria, 37 titles remained for the final analysis: a retrospective, observational, real-life study, two case series publications, and 34 case reports published in academic poster sessions and letters to the editor. In general, the use of monoclonal antibodies approved for severe asthma could be useful for the control of ICEP, since most of the results show a good response for clinical and radiological outcomes. Biological drugs seem to be a safer option for controlling relapses in ICEP, allowing lowering/suspension of OSs, and sometimes replacing them in patients intolerant to them, patients with significant comorbidities, and patients who have already developed adverse events.

CONCLUSION

The extent of the evidence supporting management of ICEP with monoclonal antibodies against IL-5 and IgE (omalizumab) is limited, but it could be promising in patients who present frequent relapses, in cortico-dependent individuals, or in patients in whom the use of steroids is contraindicated. The extent of the evidence for management with dupilumab is more limited. Studies with better design and structure are needed to evaluate quality of life and outcomes during a clear follow-up period. To our knowledge, this is the first scoping review of the literature showing the extent of the evidence for the management of ICEP with monoclonal antibodies.

Long-term use of mepolizumab in a case of chronic eosinophilic pneumonia: extending interval dosing

INTRODUCTION

Mepolizumab, a humanized anti IL-5 monoclonal antibody, has been used off-label for chronic eosinophilic pneumonia (CEP), inducing disease remission and saving systemic corticosteroids.

CASE STUDY

We present a case of CEP, requiring long-term corticosteroids therapy due to relapse upon withdrawal. Mepolizumab was started and maintained for 2 years and 6 months.

RESULTS

Corticosteroids could be withdrawn and mepolizumab dose interval was spared up to 10 wk with no disease relapse.

CONCLUSION

Mepolizumab is shown to be useful for chronic eosinophilic pneumonia, allowing corticosteroid withdrawal. Dose interval may be individualized under close monitoring, for a more efficient treatment, reducing medical costs while improving patients' quality of life.

Anti-IL-5 Agents for the Treatment of Idiopathic Chronic Eosinophilic Pneumonia: A Case Series

Purpose

Idiopathic chronic eosinophilic pneumonia (ICEP) is a rare, chronic respiratory disease. Corticosteroid therapy is effective for ICEP, but relapse is frequent after its tapering, which leads to chronic use and corticosteroid-related adverse effects. Currently, biological agents targeting interleukin 5 (IL-5) are considered alternatives for treating ICEP patients with frequent relapse, but the detailed effects are not fully understood.

Patients and Methods

The clinical characteristics of 30 patients with ICEP, especially 12 patients with ICEP who experienced relapse after corticosteroid dose tapering, were evaluated retrospectively. In addition, 4 ICEP patients with frequent relapse treated by IL-5-targeted biological agents were reviewed.

Results

Of the 30 patients diagnosed with ICEP, 12 patients (40.0%) recurred after corticosteroid dose tapering, and 9 (30.0%) were treated with maintenance doses of corticosteroid. Of ICEP patients who experienced recurrence, 6 (50.0%) had frequent relapses (2 or more times). All 4 patients treated with anti-IL-5 agents had their corticosteroid dose reduced without any relapses; in 3 patients, corticosteroids were withdrawn.

Conclusion

Anti-IL-5 agents might be alternatives for treating ICEP patients with frequent relapses.

Biologics for the Treatment of Allergic Conditions: Eosinophil Disorders

Eosinophil-associated diseases are characterized by a common pathogenetic background, represented by eosinophil-led inflammation and overexpression of interleukin (IL)-5. IL-5 and its receptor are excellent therapeutic targets for eosinophil-associated diseases. Three monoclonal antibodies targeting IL-5 currently are available: mepolizumab and reslizumab block circulating IL-5 preventing the binding to its receptor, whereas benralizumab binds to IL-5 receptor α. They have a steroid-sparing effect in eosinophil disorders, such as eosinophilic granulomatosis with polyangiitis, hypereosinophilic syndrome, allergic bronchopulmonary aspergillosis, eosinophilic esophagitis, and chronic eosinophilic pneumonia. The biotechnological drugs targeting IL-5 are promising therapies; however, further studies are needed.