O4.2 Inhaled corticosteroids and long-acting beta2-agonists and long-acting antimuscarinics in combination (ICS/LABA/LAMA)

More data are becoming available on the efficacy of multiple inhaled medications to guide the best combination that will optimise patient’s lung function, improve symptoms and prevent/ reduce exacerbations.

ICS/LABA plus LAMA

The GLISTEN three arm study compared the addition of glycopyrronium or tiotropium or placebo to salmeterol/fluticasone propionate.  The addition of either of the LAMAs demonstrated statistically significant improvements to FEV1 (101 ml at 12 weeks), a statistically but not clinically significant change in health status (2.15units SGRQ) and reduced rescue medications (less than one puff per day) (Frith 2015).

A two-year double-blind, double dummy randomised controlled trial comparing tiotropium and combination therapy with fluticasone/salmeterol (500/50 μg bd) (Wedzicha 2008) found no difference in exacerbation rates between the groups (the primary aim of the study), but the combination therapy group achieved a small, statistically significant benefit in quality of life as well as the unexpected benefit of fewer deaths [evidence level II].

A Cochrane systematic review (Rojas-Reyes 2016) that compared tiotropium plus LABA/ICS combination therapy versus tiotropium found no significant difference in risk of hospital admission with the use of tiotropium + LABA/ICS (two studies; 961 participants; OR 0.84, 95% CI 0.53 to 1.33; I2 = 0%); the quality of evidence for this outcome is low because of the risk of bias in included studies and imprecision of the estimates of effect [evidence level I].

Health-related quality of life (HRQoL) measured by SGRQ showed a statistically significant but not clinically significant improvement in total scores with the use of tiotropium plus LABA/ICS compared with tiotropium alone (mean difference (MD) -3.46, 95% CI -5.05 to -1.87; four studies; 1,446 participants. Statistically significant changes in FEV1 with the use of tiotropium plus LABA/ICS compared with tiotropium plus placebo were observed (four studies; 1,678 participants; MD 0.06, 95% CI 0.04 to 0.08); however, the difference in treatment effect on FEV1 was 60 mL and did not reach the MCID. Compared with the use of tiotropium alone, tiotropium plus LABA/ICS-based therapy does not seem to increase adverse effects. Evidence is insufficient to support the benefit of “triple” therapy for mortality or exacerbations (low-quality evidence). Not all people included in these studies had COPD that was severe enough to be recommended “triple” therapy according to current guidelines [evidence level I].

ICS/LABA/LAMA – single inhaler triple therapy

Beclometasone/formoterol/glycopyrronium: The TRINITY study evaluated the use of extra-fine beclometasone dipropionate (BDP), formoterol fumarate (FF) and glycopyrronium bromide BDP/FF/GB (fixed triple) (n=1078) compared to tiotropium, with a free combination of BDP/FF in one inhaler (n=538) and tiotropium (n=1075) in a second inhaler as a control (Vestbo 2017). The rates of moderate to severe COPD exacerbations were 0·46 (0·41–0·51) per patient per year for fixed triple, 0·57 (0·52–0·63) for tiotropium, and 0·45 (0·39–0·52) for open triple. Extra-fine particle fixed triple was superior to tiotropium, with an adjusted rate ratio (RR) of 0·80 (95% CI 0·69–0·92; p=0·0025). The time to first severe exacerbation was prolonged with fixed triple compared with tiotropium (HR 0·70 [95% CI 0·52–0·95]; p=0·0208), and was similar for fixed triple and open triple (1·05 [0·70–1·56]; p=0·82). The adjusted mean changes from baseline in pre-dose FEV1 at week 52 were 0·082 L (95% CI 0·065 to 0·100) for fixed triple, 0·021 L (0·003 to 0·039) for tiotropium and 0·085 L (0·061 to 0·110) for open triple. The incidence of adverse events (55 to 58%), including serious adverse events (13 to 15%) and pneumonia (1 to 2%) were similar across the three groups.

In the TRILOGY study, escalation to ICS/LABA/LAMA in a single inhaler, in patients already taking ICS/LABA, was tested in a 52 week RCT of 1,368 COPD patients who had FEV1 <50% predicted, one or more exacerbations in the last 12 months, and significant dyspnoea and impact of COPD (Singh 2016a) [evidence level II]. Compared to ICS/LABA (beclometasone/formoterol), ICS/LABA/LAMA in a single MDI (beclometasone 100µg/formoterol 6 µg/glycopyrronium 12.5 µg, two inhalations twice daily) improved pre-dose FEV1 by 0.081 L (95% CI 0.052-0.109) at week 26, with no difference in dyspnoea score. At week 52, beclometasone/formoterol/glycopyrronium was associated with a reduced rate of moderate-severe exacerbations (rate ratio 0.77, 95% CI 0.65-0.92) and increased proportion of patients having a beneficial improvement in SGRQ (rate ratio 1.33, 95% CI 1.06-1.66). In patients with severe COPD and frequent exacerbations, ICS/LABA/LAMA in a single inhaler may be more beneficial than ICS/LABA. The combination of beclometasone/formoterol/glycopyrronium is not currently available in Australia.

In the TRIBUTE study of COPD patients with severe airflow obstruction and frequent exacerbations, ICS/LABA/LAMA in a single MDI (beclometasone/formoterol/glycopyrronium, twice daily) was associated with reduced exacerbations over 52 weeks (rate ratio 0·85, 95% CI 0·72–0·99), compared to once daily LABA/LAMA (indacaterol/glycopyrronium) (Papi 2018) [evidence level II]. Pneumonia rates were similar.

Budesonide/formoterol/glycopyrronium: In patients with severe COPD and frequent exacerbations, ICS/LABA/LAMA may be more beneficial than dual therapies ICS/LABA and LAMA/LABA. In the 24-week KRONOS study, triple therapy (ICS/LABA/LAMA – budesonide/formoterol/glycopyrronium MDI) was compared with dual therapies (ICS/LABA – budesonide/formoterol as MDI or DPI, and LAMA/LABA MDI – glycopyrrolate/formoterol) (Ferguson 2018) [evidence level II]. Triple therapy improved lung function compared to budesonide/formoterol and glycopyrrolate/formoterol. The rate of moderate or severe exacerbations was lower in the triple therapy group.

The combinations of beclometasone/formoterol/glycopyrronium and budesonide/formoterol/glycopyrronium are not currently available in Australia.

Fluticasone furoate/umeclidinium/vilanterol: In a 24-week RCT of 1,810 patients with moderate to severe COPD, once daily fluticasone furoate/umeclidinium/vilanterol in a single inhaler was compared to twice daily budesonide/formoterol (Lipson 2017). Fluticasone furoate/umeclidinium/vilanterol improved FEV1 (mean difference 171 ml, 95% CI 148 to 194) and SGRQ total score (mean difference -2.2 units, 95% CI -3.5 to -1.0), and reduced exacerbation rates (rate ratio 0.65, 95% CI 0.49 to 0.86), supporting some benefits of single inhaler triple therapy.

The IMPACT trial (n=10,355) compared triple therapy (ICS/LABA/LAMA – fluticasone furoate, umeclidinium and vilanterol) with dual therapies using the same molecules (ICS/LABA and LAMA/LABA), all administered once-daily via an Ellipta dry powder single-inhaler (Lipson 2018).  This demonstrated a significantly lower rate of moderate or severe COPD exacerbations – 0.91 per year, as compared with 1.07 per year in the fluticasone furoate–vilanterol group (rate ratio with triple therapy, 0.85; 95% CI 0.80 to 0.90; 15% difference; p<0.001) and 1.21 per year in the umeclidinium–vilanterol group (rate ratio with triple therapy, 0.75; 95% CI 0.70 to 0.81; 25% difference; p<0.001).  The annual rate of severe exacerbations (resulting in hospitalisation) in the triple therapy group was 0.13, as compared with 0.19 in the umeclidinium–vilanterol group (rate ratio 0.66; 95% CI 0.56 to 0.78; 34% difference; p<0.001). Overall, the adverse-event profile of triple therapy was similar to that of the dual therapy comparators. Incidence of pneumonia was higher in the ICS groups than in the umeclidinium–vilanterol group, and the risk of clinician-diagnosed pneumonia was also significantly higher with triple therapy than with umeclidinium–vilanterol (hazard ratio 1.53; 95% CI 1.22 to 1.92; p<0.001).

The difference in the mean change in trough FEV1 between the triple therapy and fluticasone furoate–vilanterol groups was 97 ml (95% CI 85 to 109; p<0.001), and the difference between the triple therapy and umeclidinium–vilanterol groups was 54 ml (95% CI 39 to 69; p<0.001). There were significant differences between the triple therapy group and the fluticasone furoate–vilanterol and umeclidinium–vilanterol groups in the mean change from baseline in the SGRQ total score (–1.8 [–2.4 to –1.1] and –1.8 [–2.6 to –1.0], respectively; both p<0.001) and in the percentage of patients who had a response as defined by a decrease in the SGRQ total score of at least 4 points (1.41 [1.29 to 1.55] and 1.41 [1.26 to 1.57], respectively; both p<0.001).  ICS regimens also showed a possible signal toward lower all-cause mortality during treatment than umeclidinium–vilanterol.

In pre-specified secondary analyses of patients with eosinophil levels <150 cells/μL, the annual rate of moderate or severe exacerbations was 0.85 (95% CI 0.80 to 0.91) with triple therapy, 1.06 (95% CI 0.99 to 1.14) with fluticasone furoate–vilanterol and 0.97 (95% CI 0.88 to 1.07) with umeclidinium–vilanterol. Among patients with eosinophil levels of at least 150 cells/μL, the annual rate was 0.95 (95% CI 0.90 to 1.01) with triple therapy, 1.08 (95% CI 1.02 to 1.14) with fluticasone furoate–vilanterol, and 1.39 (95% CI 1.29 to 1.51) with umeclidinium–vilanterol.

The results described above are further supported by systematic reviews of randomised controlled trials assessing the effects of fixed and separate inhaled triple therapy versus dual therapy (of LABA and LAMA, LABA and ICS, or LAMA and ICS) or monotherapy (LAMA, LABA, or ICS) (Calzetta 2019, Cazzola 2018b, Zheng 2018). In a meta-analysis of 13 randomised controlled trials including 15,519 patients with COPD (Calzetta 2019) [evidence level I], triple therapy was significantly more effective than the ICS/LABA combination in improving trough FEV1, HRQoL and dyspnoea, and protecting against the risk of moderate or severe exacerbations, without compromising cardiovascular safety. The NNT for a ≥100-mL increase from baseline in trough FEV1 of ICS/LABA/LAMA combination versus ICS/LABA combination was 3.97 (95% CI, 3.25-5.13) and for protection against the risk of a COPD exacerbation was 26.07 (95% CI, 16.79-152.70).

A network meta-analysis of 14 trials found that ICS/LABA/LAMA combination therapy significantly (p<0.001) reduced the risk of moderate or severe COPD exacerbation compared to LABA/LAMA combination therapy (relative effect 0.70, 95% CrI 0.53–0.94) and single long-acting bronchodilator therapy (relative effect 0.62, 95% CrI 0.48–0.80) (Cazzola 2018b). No significant difference was found for the risk of pneumonia when comparing ICS/LABA/LAMA combination therapy with LABA/LAMA combination therapy (relative effect 1.36, 95% CrI 0.84– 2.00) and single long-acting bronchodilator therapy (relative effect 1.31, 95% CrI 0.76–2.32). Females with COPD seemed to be at higher risk of pneumonia and the risk of pneumonia was greater when the value of FEV1 was high at enrolment.

In a meta-analysis of 21 trials, triple therapy reduced moderate or severe exacerbations compared to LAMA/LABA (rate ratio 0.78, 95% CI 0.70 to 0.88) or ICS/LABA (rate ratio 0.77, 95% CI 0.66 to 0.91) (Zheng 2018) [evidence level I]. A meta-analysis of two trials (Bremner 2018, Vestbo 2017) directly comparing fixed triple therapy with separate triple therapy found no statistically significant associations for all the outcomes, including exacerbations of COPD, lung function, adverse events and health related quality of life (HRQoL) (Zheng 2018).

In summary, triple therapy results in a lower rate of moderate or severe COPD exacerbations, and better lung function and HRQoL than dual therapies. However, triple therapy did not improve patients’ survival, and could increase the risk of pneumonia, when compared with dual bronchodilator therapy. Therefore, triple therapy should be limited to patients with exacerbations and more severe COPD symptoms that cannot be adequately managed by dual therapy, and to patients with COPD phenotypes most likely to respond to the triple therapy. In patients with COPD already on ICS/LABA combination, the therapy can be improved without increase of cardiovascular adverse events when a LAMA is added to the combination. Triple therapy delivered in a single inhaler is convenient for patients and may improve adherence, but it is non-inferior to the use of multiple inhalers in terms of clinical efficacy.

In Australia, for initiation of triple therapy (ICS/LABA/LAMA) subsidised through the PBS, the patient must have a post-bronchodilator FEV1 <50% of predicted normal prior to therapy, AND must have a history of repeated exacerbations (2 or more) with significant symptoms despite regular bronchodilator therapy with a LAMA/LABA or an ICS/LABA OR the patient must have been stabilised on a combination of a LAMA, LABA and an ICS for COPD.