Article Text

Download PDFPDF

Pathological features and inhaled corticosteroid response of eosinophilic and non-eosinophilic asthma
  1. Mike Berry,
  2. Angela Morgan,
  3. Dominick E Shaw,
  4. Deborah Parker,
  5. Ruth Green,
  6. Christopher Brightling,
  7. Peter Bradding,
  8. Andrew J Wardlaw,
  9. Ian D Pavord
  1. Institute for Lung Health, Glenfield Hospital, Leicester, UK
  1. Professor I D Pavord, Institute for Lung Health, Glenfield Hospital, Leicester LE3 9QP, UK; ian.pavord{at}


Background: Non-eosinophilic asthma is a potentially important clinicopathological phenotype since there is evidence that it responds poorly to inhaled corticosteroid therapy. However, little is known about the underlying airway immunopathology and there are no data from placebo-controlled studies examining the effect of inhaled corticosteroids.

Methods: Airway immunopathology was investigated using induced sputum, bronchial biopsies, bronchial wash and bronchoalveolar lavage in 12 patients with symptomatic eosinophilic asthma, 11 patients with non-eosinophilic asthma and 10 healthy controls. The patients with non-eosinophilic asthma and 6 different patients with eosinophilic asthma entered a randomised, double-blind, placebo-controlled crossover study in which the effects of inhaled mometasone 400 μg once daily for 8 weeks on airway responsiveness and asthma quality of life were investigated.

Results: Patients with non-eosinophilic asthma had absence of eosinophils in the mucosa (median 4.4 cells/mm2 vs 23 cells/mm2 in eosinophilic asthma and 0 cells/mm2 in normal controls; p = 0.03) and normal subepithelial layer thickness (5.8 μm vs 10.3 μm in eosinophilic asthma and 5.1 μm in controls, p = 0.002). Non-eosinophilic and eosinophilic asthma groups had increased mast cell numbers in the airway smooth muscle compared with normal controls (9 vs 8 vs 0 cells/mm2, p = 0.016). Compared with placebo, 8 weeks of treatment with inhaled mometasone led to less improvement in methacholine PC20 (0.5 vs 5.5 doubling concentrations, 95% CI of difference 1.1 to 9.1; p = 0.018) and asthma quality of life (0.2 vs 1.0 points, 95% CI of difference 0.27 to 1.43; p = 0.008).

Conclusions: Non-eosinophilic asthma represents a pathologically distinct disease phenotype which is characterised by the absence of airway eosinophilia, normal subepithelial layer thickness and a poor short-term response to treatment with inhaled corticosteroids.

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.


  • This study was sponsored by a project grant from Asthma UK. The mometasone inhalers were a generous gift from Schering-Plough who had no role in the study.

  • Competing interests: None.

  • Abbreviations:
    bronchoalveolar lavage
    eosinophilic cationic protein
    forced expiratory volume in 1 s
    glycol methacrylate
    interferon γ
    concentration of methacholine provoking a 20% fall in FEV1

Linked Articles