Pharmacotherapeutic group: Drugs for obstructive airways diseases, adrenergics in combination with corticosteroids or other drugs, excl. anticholinergics ATC code: R03AK10.
Mechanism of action
Fluticasone furoate and vilanterol represent two classes of medications (a synthetic corticosteroid and a selective, long-acting beta2-receptor agonist).
Pharmacodynamic effects
Fluticasone furoate
Fluticasone furoate is a synthetic trifluorinated corticosteroid with potent anti-inflammatory activity. The precise mechanism through which fluticasone furoate affects asthma and COPD symptoms is not known. Corticosteroids have been shown to have a wide range of actions on multiple cell types (e.g. eosinophils, macrophages, lymphocytes) and mediators (e.g. cytokines and chemokines involved in inflammation).
Vilanterol trifenatate
Vilanterol trifenatate is a selective long-acting, beta2-adrenergic agonist (LABA).
The pharmacologic effects of beta2-adrenoceptor agonist active substance, including vilanterol trifenatate, are at least in part attributable to stimulation of intracellular adenylate cyclase, the enzyme that catalyzes the conversion of adenosine triphosphate (ATP) to cyclic-3',5'-adenosine monophosphate (cyclic AMP). Increased cyclic AMP levels cause relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.
Molecular interactions occur between corticosteroids and LABAs, whereby steroids activate the beta2-receptor gene, increasing receptor number and sensitivity and LABAs prime the glucocorticoid receptor for steroid-dependent activation and enhance cell nuclear translocation. These synergistic interactions are reflected in enhanced anti-inflammatory activity, which has been demonstrated in vitro and in vivo in a range of inflammatory cells relevant to the pathophysiology of both asthma and COPD. In peripheral blood mononuclear cells from subjects with COPD, a larger anti-inflammatory effect was seen in the presence of the combination of fluticasone furoate/vilanterol compared with fluticasone furoate alone at concentrations achieved with clinical doses. The enhanced anti-inflammatory effect of the LABA component was similar to that obtained with other ICS/LABA combinations.
Clinical efficacy and safety
Asthma
Three phase III randomised, double-blind studies (HZA106827, HZA106829 and HZA106837) of different durations evaluated the safety and efficacy of fluticasone furoate/vilanterol in adult and adolescent patients with persistent asthma. All subjects were using an ICS (Inhaled corticosteroid) with or without LABA for at least 12 weeks prior to visit 1. In HZA106837 all patients had at least one exacerbation that required treatment with oral corticosteroids in the year prior to visit 1. HZA106827 was 12 weeks in duration and evaluated the efficacy of fluticasone furoate/vilanterol 92/22 micrograms [n=201] and FF 92 micrograms [n=205]) compared with placebo [n=203], all administered once daily. HZA106829 was 24 weeks in duration and evaluated the efficacy of fluticasone furoate/vilanterol 184/22 micrograms [n=197] and FF 184 micrograms [n=194]) both administered once daily compared with FP 500 micrograms twice daily [n=195].
In HZA106827/HZA106829 the co-primary efficacy endpoints were change from baseline in clinic visit trough (pre-bronchodilator and pre-dose) FEV1 at the end of the treatment period in all subjects and weighted mean serial FEV1 over 0-24 hours post-dose calculated in a subset of subjects at the end of the treatment period. Change from baseline in the percentage of rescue-free 24-hour periods during treatment was a powered secondary endpoint. Results for the primary and key secondary endpoints in these studies are described in Table 1.
Table 1 - Results of primary and key secondary endpoints in HZA106827 and HZA106829
| Study No. | HZA106829 | HZA106827 |
| Treatment Dose of FF/VI* (micrograms) | FF/VI 184/22 Once Daily vs FF 184 Once Daily | FF/VI 184/22 Once Daily vs FP 500 Twice Daily | FF/VI 92/22 Once Daily vs FF 92 Once Daily | FF/VI 92/22 Once Daily vs placebo Once Daily |
| Change from Baseline in Trough FEV1 Last Observation Carried Forward (LOCF) |
| Treatment difference P value (95% CI) | 193 mL p<0.001 (108, 277) | 210 mL p<0.001 (127, 294) | 36 mL p=0.405 (-48, 120) | 172 mL p<0.001 (87, 258) |
| Weighted Mean Serial FEV1 over 0-24 hours post-dose |
| Treatment difference P value (95% CI) | 136 mL p=0.048 (1, 270) | 206 mL p=0.003 (73, 339) | 116 mL p=0.06 (-5, 236) | 302 mL p<0.001 (178, 426) |
| Change from Baseline in Percentage of Rescue-Free 24-hour Periods |
| Treatment difference P value (95% CI) | 11.7% p<0.001 (4.9, 18.4) | 6.3% p=0.067 (-0.4, 13.1) | 10.6% p<0.001 (4.3, 16.8) | 19.3% p<0.001 (13.0, 25.6) |
| Change from Baseline in Percentage of Symptom-Free 24-hour Periods |
| Treatment difference P value (95% CI) | 8.4% p=0.010 (2.0, 14.8) | 4.9% p=0.137 (-1.6, 11.3) | 12.1% p<0.001 (6.2, 18.1) | 18.0% p<0.001 (12.0, 23.9) |
| Change from Baseline in AM Peak Expiratory Flow |
| Treatment difference P value (95% CI) | 33.5 L/min p<0.001 (22.3, 41.7) | 32.9 L/min p<0.001 (24.8, 41.1) | 14.6 L/min p<0.001 (7.9, 21.3) | 33.3 L/min p<0.001 (26.5, 40.0) |
| Change from Baseline in PM Peak Expiratory Flow |
| Treatment difference P value (95% CI) | 30.7 L/min p<0.001 (22.5, 38.9) | 26.2 L/min p<0.001 (18.0, 34.3) | 12.3 L/min p<0.001 (5.8, 18.8) | 28.2 L/min p<0.001 (21.7, 34.8) |
*FF/VI = fluticasone furoate/vilanterol
HZA106837 was of variable treatment duration (from a minimum of 24 weeks to a maximum of 76 weeks with the majority of patients treated for at least 52 weeks). In HZA106837 patients were randomised to receive either fluticasone furoate/vilanterol 92/22 micrograms [n=1009] or FF 92 micrograms [n=1010] both administered once daily. In HZA106837 the primary endpoint was the time to first severe asthma exacerbation. A severe asthma exacerbation was defined as deterioration of asthma requiring the use of systemic corticosteroids for at least 3 days or an inpatient hospitalization or emergency department visit due to asthma that required systemic corticosteroids. Adjusted mean change from baseline in trough FEV1 was also evaluated as a secondary endpoint.
In HZA106837 the risk of experiencing a severe asthma exacerbation in patients receiving fluticasone furoate/vilanterol 92/22 micrograms was reduced by 20% compared with FF 92 micrograms alone (hazard ratio 0.795, p=0.036 95% CI 0.642, 0.985). The rate of severe asthma exacerbations per patient per year was 0.19 in the FF 92 micrograms group (approximately 1 in every 5 years) and 0.14 in the fluticasone furoate/vilanterol 92/22 micrograms group (approximately 1 in every 7 years). The ratio of the exacerbation rate for fluticasone furoate/vilanterol 92/22 micrograms versus FF 92 micrograms was 0.755 (95% CI 0.603, 0.945). This represents a 25% reduction in the rate of severe asthma exacerbations for subjects treated with fluticasone furoate/vilanterol 92/22 micrograms compared with FF 92 (p=0.014). The 24-hour bronchodilator effect of fluticasone furoate/vilanterol was maintained throughout a one-year treatment period with no evidence of loss in efficacy (no tachyphylaxis). Fluticasone furoate/vilanterol 92 /22 micrograms consistently demonstrated 83 mL to 95 mL improvements in trough FEV1 at weeks 12, 36 and 52 and Endpoint compared with FF 92 micrograms (p<0.001 95% CI 52, 126 mL at Endpoint). Forty four percent of patients in the fluticasone furoate/vilanterol 92/22 micrograms group were well controlled (ACQ7 ≤0.75) at end of treatment compared to 36% of subjects in the FF 92 micrograms group (p<0.001 95% CI 1.23, 1.82).
Studies versus salmeterol/fluticasone propionate combinations
In a 24 week study (HZA113091) in adult and adolescent patients with uncontrolled persistent asthma both fluticasone furoate/vilanterol 92/22 micrograms given once daily in the evening and salmeterol/FP 50/250 micrograms given twice daily demonstrated improvements from baseline in lung function. Adjusted mean treatment increases from baseline in weighted mean 0-24 hours FEV1 of 341 mL (fluticasone furoate/vilanterol) and 377 mL (salmeterol/FP) demonstrated an overall improvement in lung function over 24 hours for both treatments. The adjusted mean treatment difference of -37 mL between the groups was not statistically significant (p=0.162). For trough FEV1 subjects in the fluticasone furoate/vilanterol group achieved a LS mean change from baseline of 281 mL and subjects in the salmeterol/FP group a change of 300 mL; (the difference in adjusted mean of -19 mL (95%CI:-0.073, 0.034) was not statistically significant (p=0.485).
A randomised, double-blind, parallel group, 24 week study (201378) was conducted to demonstrate non-inferiority (using a margin of -100 mL for trough FEV1) of fluticasone furoate/vilanterol 92/22 micrograms once daily to salmeterol/FP 50/250 micrograms twice daily in adults and adolescents whose asthma was well controlled following 4 weeks of treatment with open-label salmeterol/FP 50/250 micrograms twice daily (N=1504). Subjects randomised to once-daily FF/VI maintained lung function comparable with those randomised to twice-daily salmeterol/FP [difference in trough FEV1 of +19 mL (95% CI: -11, 49)].
No comparative studies versus salmeterol/FP or versus other ICS/LABA combinations have been conducted to appropriately compare the effects of asthma exacerbations.
Fluticasone furoate monotherapy
A 24 week randomised, double-blind placebo controlled study (FFA112059) evaluated the safety and efficacy of FF 92 micrograms once daily [n= 114] and FP 250 micrograms twice daily [n=114] versus placebo [n=115] in adult and adolescent patients with persistent asthma. All subjects had to have been on a stable dose of an ICS for at least 4 weeks prior to visit 1 (screening visit) and the use of LABAs was not permitted within 4 weeks of visit 1. The primary efficacy endpoint was change from baseline in clinic visit trough (pre-bronchodilator and pre-dose) FEV1 at the end of the treatment period. Change from baseline in the percentage of rescue-free 24-hour periods during the 24-week treatment period was a powered secondary. At the 24-week time point FF and FP increased trough FEV1 by 146 mL (95% CI 36, 257 mL, p=0.009) and 145 mL (95% CI 33, 257 mL, p=0.011) respectively compared to placebo. FF and FP both increased the percentage of 24 hour rescue-free periods by 14.8% (95% CI 6.9, 22.7, p<0.001) and 17.9% (95% CI 10.0, 25.7, p<0.001) respectively versus placebo.
Allergen challenge study
The bronchoprotective effect of fluticasone furoate/vilanterol 92/22 micrograms on the early and late asthmatic response to inhaled allergen was evaluated in a repeat dose, placebo-controlled four-way crossover study (HZA113126) in patients with mild asthma. Patients were randomized to receive fluticasone furoate/vilanterol 92/22 micrograms, FF 92 micrograms, vilanterol 22 micrograms or placebo once daily for 21 days followed by challenge with allergen 1 hour after the final dose. The allergen was house dust mite, cat dander, or birch pollen; the selection was based on individual screening tests. Serial FEV1 measurements were compared with pre-allergen challenge values taken after saline inhalation (baseline). Overall, the greatest effects on the early asthmatic response were seen with fluticasone furoate/vilanterol 92/22 micrograms compared with FF 92 micrograms or vilanterol 22 micrograms alone. Both fluticasone furoate/vilanterol 92/22 micrograms and FF 92 micrograms virtually abolished the late asthmatic response compared with vilanterol alone. Fluticasone furoate/vilanterol 92/22 micrograms provided significantly greater protection against allergen-induced bronchial hyper-reactivity compared with monotherapies FF and vilanterol as assessed on Day 22 by methacholine challenge.
Bronchoprotective and HPA-axis effects study
The bronchoprotective and HPA-axis effects of FF versus FP or budesonide (BUD) were evaluated in an escalating repeat-dose, placebo-controlled, crossover study (203162) in 54 adults with a history of asthma, characterised by airway hyperresponsiveness and FEV1 ≥65% predicted. Patients were randomised to one or two treatment periods, comprising five 7-day dose-escalation phases of FF (25, 100, 200, 400, 800 micrograms/day), FP (50, 200, 500, 1,000, 2,000 micrograms/day), BUD (100, 400, 800, 1,600, 3,200 micrograms/day), or placebo. After each dose-escalation phase, bronchoprotection via airway hyperresponsiveness to adenosine-5'-monophosphate (AMP) challenge (provocative concentration causing ≥20% decline in FEV1 [AMP PC20]) and 24-hour weighted mean plasma cortisol were assessed.
Across the approved therapeutic dose ranges for asthma the AMP PC20 (mg/mL) and cortisol suppression (%) values were: 81 to 116 mg/mL and 7% to 14% for FF (100 to 200 micrograms/day), 20 to 76 mg/mL and 7% to 50% for FP (200 to 2,000 micrograms/day), and 24 to 54 mg/mL and 13% to 44% for BUD (400 to 1,600 micrograms/day), respectively.
Paediatric population
Asthma
The efficacy and safety of fluticasone furoate (FF)/vilanterol (VI) administered once daily compared to FF administered once daily in the treatment of asthma in paediatric patients aged 5-11 years was evaluated in a randomised, double-blind, multicentre clinical trial of 24 weeks duration and 1‑week follow-up period (HZA107116) involving 673 patients with uncontrolled asthma, on inhaled corticosteroids.
All subjects had stable asthma therapy [short-acting beta agonist or short-acting muscarinic antagonist inhaler plus inhaled corticosteroid (ICS)] for at least 4 weeks prior to Visit 1. Patients were symptomatic (i.e., remained uncontrolled) on their existing asthma treatment.
Subjects were treated with fluticasone furoate/vilanterol 46/22 micrograms (337 patients) or fluticasone furoate 46 micrograms (336 patients). Two patients, one in each arm, were not assessable for efficacy.
The primary endpoint was change from baseline, averaged over weeks 1 to 12 of the treatment period, in pre-dose (i.e., trough) morning peak expiratory flow (PEF), captured daily via electronic patient diary (difference between FF/VI combination and FF). Change from baseline in the percentage of rescue-free 24-hour periods over weeks 1 to 12 of the treatment period was a powered secondary endpoint for the 5-11 years population. There were no differences in efficacy between FF/VI 46/22 micrograms and FF 46 micrograms (Table 2). No new safety concerns were identified during this study.
After study HZA107116 completed, a non-compliance issue was discovered at two sites, involving total of 4 randomised patients (FF/VI 46/22 micrograms n= 1, FF 46 micrograms n = 3). The results (Table 2) are from a post-hoc supplementary analysis (which excluded these 4 patients) and are consistent with the pre-defined analysis
Table 2: Results of primary and powered secondary endpoints from a post-hoc supplementary analysis (after study HZA107116 completed).
| Weeks 1 to 12 | Fluticasone furoate/Vilanterol* n=335 | Fluticasone furoate* n=332 |
| Primary endpoint |
| Change from Baseline in AM PEF (L/min) |
| LS Mean Change (SE) | 12.1 (1.86) | 8.6 (1.87) |
| Treatment difference (FF/VI vs FF) (95% CI), p-value | 3.5 (-1.7, 8.7), p=0.188 |
| Powered secondary endpoint |
| Change from Baseline in Percentage of Rescue-free 24-hour Periods |
| LS Mean Change (SE) | 27.1 (1.75) | 26.0 (1.76) |
| Treatment difference (FF/VI vs FF) (95% CI), p-value | 1.1 (-3.8, 6.0), p=0.659 |
*Patients were receiving FF/VI 46/22 micrograms OD vs FF 46 micrograms OD
OD = Once Daily, LS = least squares, SE = standard error, CI = confidence interval, n = number of participants in analysis (All ITT: 337 for FF/VI and 336 for FF)