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Montelukast versus fluticasone: effects on lung function, airway responsiveness and inflammation in moderate asthma

F. Kanniess, K. Richter, S. Böhme, R.A. Jörres, H. Magnussen
European Respiratory Journal 2002 20: 853-858; DOI: 10.1183/09031936.02.00244602
F. Kanniess
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K. Richter
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S. Böhme
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R.A. Jörres
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H. Magnussen
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Abstract

Whether leukotriene receptor antagonists exhibit adequate anti-inflammatory effects in the treatment of asthma is still a controversial issue. The aim of the present study was to perform a direct comparison of the effects of a 4-week treatment with either montelukast (10 mg, once a day) or low-dose inhaled fluticasone (100 µg b.i.d.) on functional and inflammatory parameters in steroid-naïve patients with moderate asthma.

Forty patients (forced expiratory volume in one second (FEV1), 60–80% predicted) were studied in a double-blind, randomised, crossover design. Treatment periods were separated by 3–8 weeks of washout. At the beginning and end of each period, FEV1, airway responsiveness to inhaled methacholine (provocative concentration causing a 20% fall in FEV1 (PC20)), the level of exhaled nitric oxide (NO) and sputum differential cell counts were determined. Only short-acting β2-agonists were allowed for relief of symptoms.

FEV1 increased by 0.50±0.07 L (mean±sem) after fluticasone and by 0.37±0.07 L after montelukast (p<0.001, each), and PC20 by 1.33±0.13 (p<0.001) and 0.15±0.17 (ns) doubling doses, respectively. Correspondingly, percentages of sputum eosinophils were reduced by factor 2.7 (p<0.01) and 1.4 (nonsignificant (ns)), and the levels of exhaled NO (at 50 mL·s−1) by factor 2.1 (p<0.01) and 1.1 (ns).

These data indicate a comparable bronchodilator action of montelukast and fluticasone in patients with moderate asthma, but additional attenuation of airway inflammation by fluticasone as detectable through noninvasive methods.

  • bronchial hyperresponsiveness
  • exhaled nitric oxide
  • fluticasone
  • induced sputum
  • montelukast

Supported by GlaxoSmithKline, D-20354 Hamburg, Germany.

Bronchial asthma is defined as an inflammatory airway disease characterised by intermittent to chronic airway obstruction and bronchial hyperresponsiveness to pharmacological and physical stimuli 1. The chronic inflammation underlying the disease is, in particular, reflected in increased numbers of eosinophils within the airway wall and lumen 2. Accordingly, the aim of anti-asthmatic therapy is been defined not only to prevent respiratory symptoms and improve lung function, but also to attenuate or abolish airway inflammation.

The most effective anti-inflammatory drugs currently known are corticosteroids, which are widely used in the treatment of asthma 1. It is well established that corticosteroids, especially those administered via inhalation, lead to a reduction in respiratory symptoms and the frequency of asthma exacerbations, an improvement in lung function and a better long-term outcome of the patients 3.

Noninvasive procedures have been extensively used to assess airway inflammation in asthma and there is evidence that sputum eosinophils and exhaled nitric oxide (NO) are markers of asthmatic inflammation including treatment effects 4–9. Nonspecific airway responsiveness has also been advocated for achieving this, and recent data have shown methacholine responsiveness to be inversely related to airway inflammation, whereas lung function and symptoms were not 6, 10.

Of the inflammatory mediators involved in asthma, cysteinyl leukotrienes are known to play a major role in the disease 11. Therefore, appropriate receptor antagonists such as montelukast were developed, and, meanwhile, antileukotrienes became part of the recommendations for the treatment of asthma 1. Montelukast has been shown to elicit bronchodilation and to be protective against a variety of bronchoconstrictor stimuli 12–14. When added to inhaled corticosteroids, the result is better control of asthma compared to steroid treatment alone 15, through which the daily dose of steroids can simultaneously be reduced 16. In addition, the compliance with oral medication once daily is superior to repeated corticosteroid inhalation 17.

Irrespective of the data indicating a significant anti-inflammatory action of antileukotrienes, only a few studies have compared their effects with those of an inhaled corticosteroid under identical conditions 18. Such a comparison, which includes a scale for the maximally achievable effects, appears to be of particular interest in patients with moderate asthma, as inflammation and clinical state may be dissociated in these patients. In the present study, a direct, head-to-head comparison of montelukast with low-dose fluticasone was performed, assessing their effects on lung function, airway responsiveness and markers of airway inflammation and asthma control.

Material and methods

Patients

Forty nonsmoking patients with moderate, allergic bronchial asthma were included (table 1⇓). Forced expiratory volume in one second (FEV1) and provocative concentration causing a 20% fall in FEV1 (PC20) at the beginning of treatment periods were required to be within 15% and 1.5 doubling concentrations, respectively, as compared to screening. All patients were atopic, according to the results of skin-prick test, and had to show a bronchodilator effect of >15% after inhalation of 200 µg salbutamol.

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Table 1—

Patient characteristics

None of the patients were smokers or had signs of an acute exacerbation or respiratory tract infection within 4 weeks before each visit. None of the patients had received inhaled or systemic corticosteroids within 3 or 6 months, respectively, or antihistamines or theophylline within 4 weeks. The protocol was approved by the appropriate Ethics Committee and all patients gave their written informed consent.

Study design

The study followed a randomised, double-blind, crossover design comprising a 1–2-week screening period and two 4-week treatment periods, separated by a 3–8 week wash-out interval. At the screening visit and at the start and end of treatment periods, lung function, methacholine responsiveness, the level of exhaled NO, and sputum composition were determined. Daily asthma symptom scores, the use of inhaled β2-agonists and peak expiratory flow rates (PEF) were recorded over the whole time of the study.

Patients were instructed to inhale placebo or 100 µg fluticasone (diskus®; GlaxoSmithKline, Hamburg, Germany) b.i.d. and to take one 10 mg tablet of montelukast or placebo at night-time. The latter medication was taken in the evening before visits. Throughout the study, patients were allowed to inhale short-acting β2-agonists (salbutamol) as rescue medication.

Measurements

Patients filled in diary cards for day and night-time symptoms, with scores from 0 (no symptoms) to 4 (maximal symptoms, severe impairment of daytime activities, no sleep during night-time), as well as the use of rescue medication. Measurements of PEF were performed in triplicate twice daily using an electronic PEF device 19.

Spirometry was performed according to European Respiratory Society guidelines 20 using a handheld spirometer. Bronchial responsiveness to methacholine was assessed using a rapid protocol 21.

For NO measurement, patients maintained predetermined expiratory flow rates (21, 33, 69 and 207 mL·s−1, in duplicate) against varying resistances at 20 mbar 22, 23. Plateau values of exhaled NO were assessed (Sievers Instruments Inc., Boulder, Co, USA) and the level at 50 mL·s−1 derived by interpolation. The analyser was checked daily using certified calibration gas.

Sputum induction was performed as described previously 24, 25. Cell differentials were assessed and the concentration of mast cell tryptase in supernatants was determined using the Pharmacia CAP system (Pharmacia & Upjohn, Erlangen, Germany).

Statistical analysis

Values of FEV1, forced vital capacity (FVC), symptoms and the use of β2-agonists are given as arithmetic mean±sem. Values of immunoglobulin (Ig)E, sputum eosinophils, NO and tryptase are given as geometric mean±sem (to be understood as factor). Mean values of diary data and PEF from the last 7 days of treatment were compared with the last 7 days of screening or wash-out periods, respectively. Comparisons within treatments were made by paired t-tests, and comparisons between treatments by analysis of variance (ANOVA) for crossover design. Carry-over effects were excluded by prior testing. Statistical significance was assumed as p≤0.05.

Results

As indicated by ANOVA, there were no carry-over effects between treatments. Similarly, baseline values at the start of treatment periods were not significantly different from each other. Individual responses are given in figure 1⇓.

Fig. 1.—
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Fig. 1.—

Individual changes over montelukast versus fluticasone treatment. Effects on a) lung function (forced expiratory volume in one second (FEV1), L), b) airway responsiveness to methacholine (provocative concentration causing a 20% fall in FEV1 (PC20), in terms of the shift in doubling doses), c) sputum eosinophils (as per cent of nonsquamous cells) and d) the level of exhaled nitric oxide (parts per billion, at a flow rate of 50 mL·s−1) are shown.

Lung function

FEV1 significantly increased after treatment with fluticasone as well as montelukast (p<0.001, each) (table 2⇓). The respective changes were 0.50±0.07 L after fluticasone and 0.37±0.07 L after montelukast. The effects exerted by the two drugs were not significantly different from each other. FVC did not significantly change over both treatment periods.

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Table 2—

Results before and after the two 4-week treatment periods

Bronchial responsiveness

PC20 of methacholine increased significantly after treatment with fluticasone (p<0.001), the protective shift being 1.33±0.13 doubling concentrations (table 2⇑). In contrast, montelukast produced no significant effect, with an increase of 0.15±0.17 doubling concentrations. The changes in PC20 differed significantly between both drugs (p<0.001).

Induced sputum

The percentage of eosinophils in induced sputum decreased significantly (p<0.001) after fluticasone (table 2⇑), the average reduction being by factor 2.7±1.3. Montelukast had no statistically significant effect on eosinophils, the respective factor being 1.4±1.3. When comparing the effects of fluticasone and montelukast on sputum eosinophils, they were not statistically significantly different.

Tryptase levels in sputum supernatants decreased significantly after fluticasone (p<0.01; table 2⇑), whereas the change after montelukast was not statistically significant. The changes in tryptase levels differed significantly between both treatments (p<0.05).

Exhaled nitric oxide

After fluticasone the level of exhaled NO at a flow rate of 50 mL·s−1 decreased significantly (p<0.01; table 2⇑), whereas after montelukast the change was not significant. The changes were also significantly different between treatments (p<0.001).

Symptoms and use of supplemental salbutamol

Complete diary data were available in 38 patients (table 3⇓). Fluticasone, but not montelukast, led to significantly reduced daytime symptoms (p=0.05) compared to baseline. Both medications had no effect on night-time symptoms. The use of β2-agonists decreased after both treatments (p<0.05 each). When compared between treatments, neither symptom scores nor the use of β2-agonists showed a significant difference. Similar results were obtained when the analysis was restricted to patients who showed a symptom score of ≥0.5·day−1 at screening.

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Table 3—

Symptom scores over treatment periods

Peak flow measurements

Complete data were available in 32 patients. The increase in morning PEF was 46.7±12.3 L·min−1 in fluticasone (p<0.05) and 14.0±7.1 L·min−1 in montelukast (nonsiginificant (ns); fig. 2⇓). Corresponding increases for evening PEF were 31.2±7.0 after fluticasone (p<0.05) and 5.7±6.8 L·min−1 after montelukast (ns).

Fig. 2.—
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Fig. 2.—

Individual changes in peak expiratory flow (PEF) over the treatment periods. Values were computed as mean values of 7-day periods before and at the end of treatment periods. The bars indicate the group mean values. Using a pairwise comparison, values were significantly higher (p<0.05) after fluticasone treatment than after montelukast for each morning and evening PEF.

Discussion

The present data demonstrate that a 4-week treatment with either montelukast or fluticasone in patients with moderate asthma led to a significant improvement in lung function that was similar for both treatments. In addition, the use of inhaled β2-agonists was reduced by both fluticasone and montelukast. However, only fluticasone caused a significant reduction in airway responsiveness and inflammatory markers in induced sputum and exhaled air. These data suggest that, compared to 200 µg fluticasone, 10 mg montelukast daily had no anti-inflammatory effect in the patients studied. However, the clinical improvement, as observed over 4 weeks, did not seem to be critically dependent on the anti-inflammatory action.

The study was designed as a direct, head-to-head comparison of the effects of low-dose fluticasone and montelukast, with special emphasis on the simultaneous assessment of the patients' clinical state, lung function, airway responsiveness, and different noninvasive markers of airway inflammation. Several studies have been performed on the combined effect of an inhaled steroid plus an antileukotriene, but, to the best of the authors' knowledge, no studies are available that directly compare fluticasone and montelukast and include the scope of indices as measured here. To ensure that stable conditions had been reached, the duration of the treatment periods was set to 4 weeks. The superiority of antileukotrienes to placebo has been repeatedly demonstrated 16, 26, and the present study only enrolled patients in a stable clinical condition. Due to these facts, a placebo arm was omitted and efforts were made to raising the statistical power by achieving a crossover design in ≥40 patients.

Previous studies comparing the effects of an antileukotriene with those of an inhaled corticosteroid in patients with asthma, showed some differences between both drugs in terms of clinical outcome parameters. Within a parallel group setting, 12 weeks of daily treatment with 400 µg beclomethasone dipropionate (BDP) exerted larger effects on FEV1, symptom scores and the rate of asthma exacerbations than montelukast 27, but both drugs were clearly superior to placebo. Similarly, low-dose fluticasone was superior to montelukast with regard to lung function, symptoms and the use of rescue medication 18. Analogous results were obtained regarding the effect of zafirlukast in comparison to those of BDP 28. However, these studies did not assess the effect of the antileukotriene in terms of its anti-inflammatory properties.

The data from the present study did not indicate major differences between montelukast and fluticasone regarding their efficacy in terms of FEV1 or β2-agonist use. The result probably has to be attributed to the steroid dose in relation to the patients' asthma severity. It should be kept in mind that symptom scores and the supplemental use of β2-agonists were low at baseline, despite the fact that patients fulfilled the criteria of moderate asthma 1. In case the equi-efficacy of both drugs with regard to lung function and clinical state was due to a nonmaximal dose of fluticasone, this would render the differences in anti-inflammatory action even more obvious.

Attenuation of eosinophilic inflammation by montelukast has been reported previously in a group of 16 patients with asthma 12. At the same time, there was a significant reduction in daily asthma symptoms and the use of β2-agonists. The percentage of sputum eosinophils significantly increased, when taking into account the change observed with placebo, where sputum eosinophils increased from 14.5–17.9%. Similar effects have been reported with regard to the effect of montelukast or pranlukast on the number of sputum 29 or bronchial mucosal eosinophils under stable conditions 30. Antileukotrienes are also capable of attenuating allergen responses. After a 3-day treatment with montelukast, early- and late-phase allergen-induced bronchoconstriction were significantly reduced as compared to placebo 31. No significant bronchodilation was observed 12 h after the last medication. However, as far as could be shown by sputum analysis in nine patients, the allergen-induced increases in eosinophil number and eosinophil cationic protein (ECP) level did not differ between montelukast and placebo. Anti-inflammatory effects have also been reported in children with asthma who showed a decline in the level of exhaled NO during treatment with montelukast compared to placebo 13. The data of the present study revealed no significant effect of montelukast on sputum composition or NO levels and, at the same time, demonstrated the stability of these parameters and the patients' clinical condition in repeated measurements. With regard to FEV1 and PC20, stability was even part of the inclusion criteria in the present study.

The present study's data also differ from those obtained after reduction of the dose of inhaled beclomethasone during treatment with the antileukotriene pranlukast or placebo 16. In this study, the level of exhaled NO increased after treatment with placebo, whereas it remained nearly unchanged after pranlukast. The present authors do not have an explanation for the discrepancies between studies, but it might be relevant that the present study data were obtained under stable conditions in adults with moderate asthma who did show low symptom scores at inclusion. At the least, the available data suggest that the effects of anti-leukotrienes are much more variable and, on average, lower than those of corticosteroids, and depend on the patient population and experimental protocol chosen.

In summary, the data of the present study indicate that 4-week treatments with either 100 µg inhaled fluticasone b.i.d. or 10 mg montelukast daily were equi-effective with regard to their effects on lung function in patients with moderate asthma. However, only fluticasone led to a significant reduction in airway responsiveness and to significant anti-inflammatory effects on sputum eosinophils, tryptase concentrations, and the level of exhaled nitric oxide. It remains to be established whether the dissociation between effects as observed in the present study will have implications for the long-term outcome of the patients.

Acknowledgments

The authors thank O. Holz and H. Carnarius for helpful comments and S. Janicki, K. Paasch and M. Mücke for technical assistance.

  • Received May 11, 2001.
  • Accepted May 7, 2002.
  • © ERS Journals Ltd

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Montelukast versus fluticasone: effects on lung function, airway responsiveness and inflammation in moderate asthma
F. Kanniess, K. Richter, S. Böhme, R.A. Jörres, H. Magnussen
European Respiratory Journal Oct 2002, 20 (4) 853-858; DOI: 10.1183/09031936.02.00244602

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Montelukast versus fluticasone: effects on lung function, airway responsiveness and inflammation in moderate asthma
F. Kanniess, K. Richter, S. Böhme, R.A. Jörres, H. Magnussen
European Respiratory Journal Oct 2002, 20 (4) 853-858; DOI: 10.1183/09031936.02.00244602
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