Real-world Effectiveness and Cost-effectiveness of HFA-beclometasone Compared With ICS/LABA Combination Therapy

Current asthma guidelines in the UK are underpinned by evidence derived from randomised controlled trials (RCTs). Although RCT data are considered the gold standard, the patients recruited to asthma RCTs are estimated to represent less than 10% of the United Kingdom's (UK's) asthma population. The poor representation of the asthma population is due to a number of factors, such as tightly-controlled inclusion criteria for RCTs. There is therefore a need for more representative RCTs and real-life observational studies to inform existing guidelines and help optimise asthma outcomes.

The fixed combination asthma inhalers, FP/SAL (Seretide) and BUD/FOR (Symbicort) are indicated for use in asthma when adequate asthma control is not achieved with low/medium dose ICS therapy and as-needed (prn) reliever therapy (a short-acting beta-agonist [SABA]). Fixed combination inhalers are also indicated in patients already adequately controlled on separate ICS/LABA therapy. However, emerging trends in asthma prescribing indicate increasing use of add-on therapies (particularly in the form of combination inhalers) in the early stages of asthma therapy, even as first-line therapy.

In practice, there is significant pressure (supported by asthma guidelines) to use the least expensive, effective inhaled therapies available. While the effect of increased use of add-on and combination therapies in terms of patient benefits remains uncertain, the impact on the UK's National Health Service (NHS) treatment costs is unequivocal.

Short, randomised trials of the effectiveness of asthma monotherapies have demonstrated that extrafine HFA-BDP is at least as effective at half the dose as BDP pMDI, and equivalent to same-dose FP pMDI. There is also evidence to suggest that extrafine HFA-BDP optimises deposition in the lung and affords greater tolerance of poor coordination of breathing and inhaler actuation. In addition, one long-term, prospective, randomised, open-labelled trial comparing extrafine HFA-BDP with BDP over the course of one year demonstrated greater improvements in symptom-free days and quality of life in the extrafine HFA-BDP treatment group, at a lower cost per symptom-free day.

The hypothesis for this study, therefore, is that extrafine HFA-BDP may be a suitable, and cost-effective, alternative to combination therapy (as fixed or separate inhalers) in children and adults with evidence of persistent asthma.

Inclusion criteria

• Aged: 4-60 years:

• Paediatric cohort (aged 4-11 years), and
• Adult cohort (aged 12-60 years)
• Aged 61-80 years and never smoked for an additional elderly cohort;
• Evidence of asthma: i.e. a diagnostic code of asthma or at least 2 asthma prescriptions, including one ICS prescription, at different points in time during the year prior to IPD (the baseline year)
• Be on current asthma therapy: i.e. at least 1 asthma prescription in the year prior to IPD, and at least 1 other asthma prescription during the same period
• Have at least one year of up-to-standard (UTS) baseline data (prior to the IPD) and at least one year of UTS outcome data (following the IPD).

Exclusion criteria

• had a diagnostic read code for chronic obstructive pulmonary disease (COPD) at any time
• had a diagnostic read code for chronic respiratory disease at any time (other than asthma)
• any patients receiving a combination inhaler in addition to their separate ICS inhaler in the baseline year