Severe asthma: the longer biologics were delayed, the less likely remission

Design

Multinational registry cohort analysis

Population

9,241 adults starting biologics for severe asthma, 26 countries

Primary outcome

Clinical remission 12 months after biologic initiation

Effect

Per 10 years of asthma OR 0.86 (0.84–0.88); per 10 g lifetime OCS OR 0.54 (0.30–0.98)

A registry analysis in Chest (9 September) pooled 9,241 patients starting biologics for severe asthma in the International Severe Asthma Registry, the US CHRONICLE registry and the UK Optimum Patient Care database, across 26 countries.

The odds of clinical remission 12 months after starting a biologic fell with every 10 years of asthma beforehand (OR 0.86, 95% CI 0.84–0.88), with longer periods of potentially severe asthma (0.78), with impaired lung function (0.24) and with every 10 g of lifetime oral corticosteroid (0.54). Longer delay was also associated with more exacerbations and smaller lung-function gains after treatment.

The authors argue for a 'preserve' rather than 'reserve' approach. That is plausible — fixed airflow obstruction cannot be reversed by a biologic — but these are observational associations, and patients treated late may simply have had more entrenched disease.

• Assess for severe asthma early once exacerbations persist on high-dose ICS-LABA
• Measure blood eosinophils and FeNO to identify biologic candidates
• Count cumulative oral steroid courses; repeated courses are a trigger for referral
• Refer to a severe asthma service rather than waiting for irreversible airflow limitation

Why it matters

It challenges the habit of reserving biologics until every other option has failed for years.

Don't overread it

This is observational registry data — it cannot prove that starting earlier causes better outcomes.

The statistics, in plain English

An odds ratio of 0.86 per decade means remission odds fall about 14% for every extra 10 years of asthma before a biologic. Because patients were not randomised to early or late treatment, the association could reflect disease severity rather than timing.

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