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Diagnostic accuracy of minimally-invasive biomarkers for sputum eosinophilia in adult-onset asthma patients.


- candidate number17701
- NTR NumberNTR4589
- ISRCTNISRCTN no longer applicable
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR12-mei-2014
- Secondary IDsNTR 1846 (09/101 METC AMC) NTR 1838 (08/358 MEC AMC), NTR 2217 (NL 29219.099.09 CCMO)
- Public TitleDiagnostic accuracy of minimally-invasive biomarkers for sputum eosinophilia in adult-onset asthma patients.
- Scientific TitleDiagnostic accuracy of minimally-invasive biomarkers for sputum eosinophilia in adult-onset asthma patients.
- ACRONYM
- hypothesis1) FeNO, blood eosinophils and total IgE will have a moderate diagnostic accuracy to detect sputum eosinophilia in adult-onset asthma patients.
2) There will be differences in accuracy between sub-groups of patients.
- Healt Condition(s) or Problem(s) studiedAsthma, Adults, Biomarkers, Eosinophils
- Inclusion criteriaAge: 18-75 years
Physician’s diagnosis of asthma, combined with documented reversibility in FEV1 of > 12% of predicted value or a positive inhaled methacholine provocation test (PC20 < 8mg/ml) or diurnal variation in PEF of >20% (with twice daily reading >10%)
- Exclusion criteriaSmoking history of >10 pack years combined with fixed airflow obstruction (FEV1 <80% of predicted and FEV1/FVC <0.70) without reversibility in FEV1 <12% or with a diffusion capacity <80% (TLCO/VA).
Other pulmonary diseases.
Non-related major co-morbidities.
Pregnancy.
Physician’s diagnosis of childhood asthma or other chronic respiratory diseases in childhood, frequent episodes of dyspnea as a child, or use of a bronchodilator or other asthma medication in childhood.
Patients without sputum eosinophils results (reference test).
- mec approval receivedno
- multicenter trialyes
- randomisedno
- group[default]
- TypeSingle arm
- Studytypeobservational
- planned startdate 13-mei-2014
- planned closingdate1-sep-2014
- Target number of participants336
- InterventionsNA
- Primary outcomeDiagnostic accuracy of FeNO, IgE and blood eosinophils in detecting patients with sputum eosinophila ≥3%, as expressed by the:
a) AUC
b) sensitivity and corresponding threshold at a fixed specificity of 95%
c) specificity (95%CI) and corresponding threshold at a fixed sensitivity of 95%.
- Secondary outcome-Evaluate the diagnostic accuracy of FeNO, IgE and blood eosinophils in patient subgroups (eg, gender, race, smoking status, oral corticosteroid treatment status, asthma severity, BMI, nasal polyps, atopy).
-Evaluate whether combinations of FeNO, IgE and blood eosinophils improved diagnostic accuracy, as determined by the AUC.
-Build a multivariable logistic regression model including patient characteristics and marker combinations for the optimal discrimination between patients with and without sputum eosinophilia.
- TimepointsCross-sectional
- Trial web site
- statusinclusion stopped: follow-up
- CONTACT FOR PUBLIC QUERIES G.A. Westerhof
- CONTACT for SCIENTIFIC QUERIES G.A. Westerhof
- Sponsor/Initiator Academic Medical Center (AMC), Amsterdam
- Funding
(Source(s) of Monetary or Material Support)
Longfonds The Netherlands , Stichting Longgeneeskunde Fryslan, GlaxoSmithKline, Dutch Foundation for the Prevention of Asthma
- Publications
- Brief summarySputum eosinophilia ≥3% has shown to be a good predictor of responsiveness to corticosteroid treatment, but sputum induction and differential sputum cell counts are only feasible in specialized clinics, are not always successful and do not give immediate results. Less direct measures of airway inflammation such as fraction of exhaled nictric oxide (FeNO), blood eosinophils and IgE are more easily performed and widely available. Several studies have investigated the diagnostic accuracy of these markers in detecting sputum eosinophilia ≥3%, but always in a mixed population including both childhood- and adult-onset asthma. We will investigate the diagnostic accuracy of these markers for differentiating between patients with and without eosinophilia in adult-onset asthma.

We will perform a retrospective analysis of data derived from 336 asthmatic patients included in three completed prospective observational studies (acronyms: Adonis, Take-5, PANAMA). Patients were recruited from an academic and several non-academic pulmonary outpatient clinics in the Netherlands. The study protocols aimed to determine FeNO, blood eosinophils, IgE and sputum eosinophils in all these patients in 1-2 visits less than 2 weeks apart.
- Main changes (audit trail)
- RECORD12-mei-2014 - 15-jun-2014


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