Published ahead of print on September 5, 2002, doi:10.1164/rccm.200206-512OC
© 2002 American Thoracic Society
Effect of Discontinuation of Inhaled Corticosteroids in Patients with Chronic Obstructive Pulmonary DiseaseThe COPE StudyDepartment of Pulmonary Medicine, Medisch Spectrum Twente, Enschede; and Departments of Epidemiology and Biostatistics and Pulmonary Medicine, University Medical Center, Nijmegen, The Netherlands Correspondence and requests for reprints should be addressed to Paul van der Valk, Chest Physician, Department of Pulmonary Medicine, Medisch Spectrum Twente, P.O. Box 50000, 7500 KA Enschede, The Netherlands. E-mail: valkpapa{at}knmg.nl
The aim of this double-blind single center study (the COPE study) was to investigate the effect of discontinuation of the inhaled corticosteroid fluticasone propionate (FP) on exacerbations and health-related quality of life in patients with chronic obstructive pulmonary disease. After 4 months of treatment with FP (1,000 µg/day), 244 patients were randomized to either continue FP or to receive placebo for 6 months: 123 patients continued FP (FP group), and 121 received placebo (placebo group). In the FP group, 58 (47%) patients developed at least one exacerbation compared with 69 (57%) in the placebo group. The hazard ratio of a first exacerbation in the placebo group compared with the FP group was 1.5 (95% confidence interval [CI] 1.1–2.1). In the placebo group 26 patients (21.5%) experienced rapid recurrent exacerbations and were subsequently unblinded and prescribed FP compared with 6 patients (4.9%) in the FP group (relative risk = 4.4; 95% CI 1.9–10.3). Over a 6-month period, a significant difference in favor of the FP group was observed in the total score (+2.48 95% CI 0.37–4.58), activity domain (+4.64 95% CI 1.60–7.68), and symptom domain (+4.58 95% CI 1.05–8.10) of the St. George's Respiratory Questionnaire. This study indicates that discontinuation of FP in patients with chronic obstructive pulmonary disease is associated with a more rapid onset and higher recurrence-risk of exacerbations and a significant deterioration in aspects of Health-Related Quality of Life.
Key Words: COPD • inhaled corticosteroids • exacerbations • health-related quality of life
Chronic obstructive pulmonary disease (COPD) constitutes a major public health burden worldwide (1). The World Health Organization (2) estimates COPD to be the world's fifth most common disease and fourth leading cause of death. Both prevalence and mortality are expected to increase in the coming decades (3, 4). Smoking cessation (5) and bronchodilator therapy (5, 6) are the mainstay of the management of COPD. Born from the idea that both asthma and COPD result from chronic inflammation and that inhaled corticosteroids (ICS) are remarkably effective in controlling inflammation in asthma, there is an intense discussion whether or not ICS are beneficial in COPD (7, 8). Inevitably, clinicians have prescribed ICS in COPD. However, the inflammatory pattern in COPD differs markedly from that in asthma (9, 10), and the safety of long-term, high-dose ICS has not been well established (11). Beneficial clinical effects of ICS were observed in recent randomized controlled trials: amelioration of respiratory symptoms (12), persistent improvement in airways reactivity (12), decreased frequency (13) or severity (14) of exacerbations, diminished use of healthcare resources (12), and improved health-related quality of life (HRQL) (13). One observational study (15) suggested that ICS therapy is associated with reduced COPD-related morbidity and mortality in elderly patients. Of the previously mentioned outcome parameters in COPD, exacerbations are most relevant for HRQL, but in all reported studies these were only measured as secondary outcomes that were poorly defined. Inhaled corticosteroids have been shown to be ineffective in arresting long-term decline in FEV1 as recently reported in five major studies (12, 13, 16–18). A remarkable finding reported in two of these studies (13, 17) was that treatment with ICS improves FEV1 slightly in the first 3 to 6 months, an effect that is maintained during follow-up treatment. This led to the idea that this initial improvement in lung function due to ICS is worth pursuing, but the overall effect of prolonged ICS treatment is not yet clear. Only two studies have investigated the effect of withdrawal of ICS: one observational, nonrandomized, study (19) as part of the run-in phase of the ISOLDE study (13) and a small, underpowered crossover study with a short follow-up and no wash-out period (20). As most of the newly diagnosed patients with COPD receive initial trial treatment for several months, and many of them will show the initial improvement in FEV1, they will be prescribed ICS for life. Therefore, there is an urgent need for large randomized controlled studies on discontinuation of ICS treatment. We investigated the effect of discontinuing maintenance therapy with high doses (1,000 µg/day) of inhaled fluticasone propionate (FP) in a randomized, double-blind, placebo controlled study (COPE study) on time to first exacerbation and rapid recurrence of well-defined exacerbations in patients with moderate to severe COPD.
Patients All patients were recruited from one outpatient pulmonary clinic, from May 1999 till March 2000. To be eligible for the study the patients had to meet the following criteria: (1) a clinical diagnosis of stable COPD, as defined by American Thoracic Society criteria (21); (2) no history of asthma; (3) no exacerbation in the month before enrollment; (4) current or former smoker; (5) age between 40 and 75 years; (6) baseline prebronchodilator FEV1 value of 25 to 80% of predicted; (7) prebronchodilator ratio FEV1 inspiratory vital capacity (IVC) value of 60% or less; (8) reversibility of FEV1 postinhalation of 80 µg of ipratropium bromide via a metered dose inhalator with Aerochamber 12% of predicted value or less (22); (9) thin layer chromatography greater than the thin layer chromatography predicted minus 1.64 SD; (10) no maintenance treatment of oral steroids or antibiotics; (11) no medical condition with low survival or serious psychiatric morbidity (e.g., cardiac insufficiency, alcoholism); (12) absence of any other active lung disease (e.g., sarcoidosis); and (13) use of medication such as nasal corticosteroids, theophyllines, chronic use of acetylcysteine, and all other bronchodilators was allowed. The hospital's medical ethical committee approved this study. All patients provided written informed consent.
Trial Design After 4 months, eligible patients were randomly assigned to continue 500 µg of FP twice daily or to receive placebo administered via the Diskus inhalation device for 6 months. Randomization was performed in blocks of six by computer-generated allocation. Follow-up visits were scheduled 3 and 6 months post randomization. Spirometry at regular follow-up visits was measured under postbronchodilation medication and only when the patient was in a stable condition. If the patient was using a short course of oral steroids or antibiotics or was experiencing an exacerbation at the time of the follow-up visit, this visit was postponed 4 weeks. If patients experienced any worsening of their respiratory symptoms they were instructed to contact the COPE study personnel by telephone. They were subsequently invited to attend the hospital within 12 hours for spirometry measurements and consultation by one of the study physicians who subsequently decided either to continue the trial or to prescribe 500 µg of FP twice daily unblinded. The latter was allowed according to the benefit of the doubt principle in case patients experienced rapid recurrent exacerbations. This was defined as either twice an objective increase in respiratory symptoms within a 3-month period, defined as more than 20% or 300 ml decrease in FEV1, compared with stable lung function at randomization, or three times a subjective increase of respiratory symptoms in a 3-month period as experienced by the patient regardless of the criteria mentioned previously.
Outcome Measurements Patients with rapid recurrence of exacerbations were those who had to be prescribed FP unblinded due to safety reasons as mentioned previously. HRQL was measured immediately before randomization and after 3 and 6 months follow-up by means of the Dutch version of the St. George's Respiratory Questionnaire and the Euroqol 5D including a visual analogue scale. The St. George's Respiratory Questionnaire is a disease-specific instrument composed of 76 items that are weighted to produce domain scores: "symptoms," "activity," and "impact." The total score is calculated from all items and provides a global view of the patient's respiratory health. The scores range from 0 to 100, with a score of 100 indicating maximum disability (24). A difference of four units indicates a small clinically relevant effect. The Euroqol 5D visual analogue scale records the respondent's self-rated health status from 0 (worst imaginable health state) to 100 (best imaginable health state). Secondary outcome measures were lung function parameters and exercise tolerance. Spirometry was assessed immediately before randomization and after 3 and 6 months follow-up. Well-trained lung function technicians performed spirometry on water sealed spirometers according to standardized guidelines (25) and FEV1 and IVC were measured until three reproducible recordings (less than 5% difference) were obtained. Highest values were used for analyses. Exercise tolerance was measured at randomization and after 6 months follow-up by the standardized 6-minute walking test. Oxygen saturation, heart rate, and the Borg scale of breathlessness by means of a 11-point scale were recorded pretest and after every minute (26). The performance of the test was standardized: patients performed a practice walk, were instructed pretest, and no encouragement was used during the test (27). A change of 54 m in walking distance is considered clinically important (28). Use of health care facilities was registered during the study: hospitalizations, emergency room visits, scheduled and emergency outpatient visits, and exacerbations treated by the patient's general practitioner. Pharmacists reported all drugs used during the study period. Patients were asked to complete a 2-week diary before each follow-up visit and during periods of increased respiratory symptoms. In the diary, data on breathlessness, cough, sputum volume, sputum color, and use of rescue ß2-agonists was collected. Every week patients graded their health status from 1 to 10. At each visit patients were questioned about possible adverse events.
Statistical Analyses Baseline characteristics are reported as means ± SD or as percentages within groups. Analyses were performed according to the intention-to-treat principle. The effect of discontinuing FP on the subsequent exacerbation risk (the primary outcome) was assessed using Cox proportional hazard analyses. Between-group differences in the proportion of patients with rapid recurrences of exacerbations were assessed by means of chi-square tests. Between-group differences in continuous variables (Quality-of-Life-scores, lung function parameters) were assessed by analyses of repeated measurements using Proc Mixed (mixed models approach) from SAS (30). Linear regression analysis was used to assess between-group differences for the distance walked in 6 minutes. Within-patient comparisons were done by the paired t test (normal distribution) or the Wilcoxon Signed Rank Test (non-normal distribution). We adjusted the analyses for potential confounding variables if these variables were not equally distributed at randomization. We performed subgroup analyses for the patients with a FEV1 value less than 50% predicted according to the GOLD recommendations for ICS prescription (1). Except for the repeated measurements analyses, all statistical analyses were performed using SPSS version 10 (31).
Baseline Characteristics Of the 509 eligible patients, a total of 269 were enrolled (Figure 1) . The mean age of the participants was 64.0 ± 7.2 years. Table 1 shows the baseline characteristics of the study population stratified by treatment group. Except for smoking the two treatment groups were similar with respect to the known prognostic variables. Eighty-three percent (203/244) of the patients had used ICS at least 6 months before entering the study. In the year preceding the study, patients experienced a mean number of 1.3 exacerbations per year (median = 1). Long-acting ß-agonists were used by 48% of the patients in the fluticasone group and 44% of the patients in the placebo group. This difference is not statistically significant.
During the 4-months run-in phase 263 patients received 500 µg of FP twice daily. Of these, 244 patients were randomized; 123 received 500 µg of FP twice a day and 121 received placebo during a period of 6 months. In the run-in phase, 19 patients (7%) had to be withdrawn (Figure 1), 6 because of intolerance to FP. During the double-blind phase, two patients died; one in the FP group (from cancer) and the other in the placebo group from a cerebrovascular accident (Figure 1).
Exacerbations
In the placebo group, 26 patients (21.5%) experienced rapid recurrent exacerbations and were thus prescribed FP in an open way in contrast to 6 patients (4.9%) in the FP group (relative risk = 4.4; 95% CI 1.9–10.3). Five of the six patients (83%) in the FP group who were prescribed FP in an open way continued to have exacerbations over the remaining trial period in contrast to 38% (10/26) in the placebo group.
Subgroup Analysis
Health-related Quality of Life
Lung Function and Exercise Capacity During the 4-month run-in period, FEV1 did not change. Adjusted for baseline values, smoking status, and time effects, an almost statistically significant difference of 38 ml in postbronchodilation FEV1 was observed in favor of the FP group. Mean distance walked in 6 minutes and mean Borg score of breathlessness remained unchanged (Table 2) .
Safety In concordance with the primary outcome results, the frequency of serious adverse respiratory events (mainly hospital admissions for exacerbations of COPD) was higher in the placebo group (Table 3) . There was no indication that FP caused serious or nonserious adverse events.
This randomized placebo-controlled study demonstrated that discontinuation of FP (1,000 µg/day) after 4 months of maintenance therapy induced a more rapid onset and higher recurrence-risk of exacerbations in patients with moderate to severe COPD. The study was motivated by the observation in two earlier studies (13, 17) showing that ICS produces a small, initial improvement in FEV1 without additional reduction in lung function loss in subsequent years. Before enrollment in the present study, 85% of patients with COPD were receiving ICS, which may explain the lack of the improvement in FEV1 during the run-in period. The increased risk of exacerbations after withdrawal of ICS is in accordance with the limited evidence available (19, 20). In the run-in phase of the ISOLDE study (19), ICS were withheld from patients already using these medications. In the first 7 weeks post withdrawal, 38% of patients previously treated with ICS experienced an exacerbation compared with 6% of those who had not received ICS previously. Although the patients in the ISOLDE study were more severe, the higher frequency of exacerbations seen in the COPE study after withdrawal of ICS might be explained by a prospective and complete registration of exacerbations. In agreement with the ISOLDE study, the majority of exacerbations in our study occurred in the first 7 weeks. The study by O'Brien and colleagues (20) demonstrated that withdrawal of ICS in elderly patients with COPD led to deterioration in ventilatory function and increased exercise-induced dyspnea and showed a trend toward an increased frequency of exacerbations. However, results of this small crossover study should be viewed with caution as only 15 of the 24 patients completed the study, and follow-up was only 12 weeks. Moreover, lung function varied considerably (range of FEV1 between 0.73 and 2.42 L), and the only three patients with exacerbations were withdrawn. Also our own results regarding the larger decline in FEV1 in the placebo group should be viewed with caution. The difference of 38 ml seems relevant but is based only on three measurements in a period of 6 months. It should further be stressed that in most studies on effects of ICS in COPD (including the two studies dealing with effects of ICS withdrawal), exacerbations were only considered a secondary outcome and hence were poorly defined, described, or measured (13, 14). By contrast, the COPE study was designed to investigate the effect of discontinuing ICS on first and second exacerbation and occurrence of rapid recurrence of well-defined exacerbations. The exacerbation data of our study can be considered very reliable because all patients were instructed to call and visit the COPE center as soon as they experienced any serious worsening of their respiratory condition, to clinically verify the suspicion of an exacerbation. In all these instances lung function tests were performed within 12 hours. In addition, all diaries, week reports, hospital records (hospitalizations and emergency department visits), and records from the patient's general practitioner and pharmacists were searched for additional information on exacerbations. Assessment of the HRQL, which is an important outcome in COPD studies (10), provided us with a comprehensive picture of the overall impact of FP treatment withdrawal in COPD (32). This study showed a significant deterioration in the total score, symptoms, and activity domains of the St. George's Respiratory Questionnaire in the placebo group. This suggests that discontinuation of FP affects distress, due to respiratory symptoms, and disturbance of physical activity but does not affect the impact on daily living. These findings are in line with the study by Spencer and colleagues (33). Their results suggest that FP has greatest influence on deterioration in physical aspects of health rather than psychosocial functions. Another study assessing the effect of exacerbations on HRQL in COPD, however, showed a worse St. George's Respiratory Questionnaire total and domain scores in patients with frequent exacerbations (34). Based on this study, one expects worse health status in our patients in the placebo group because of their higher rate of exacerbations. However, it should be noted that the patients with frequent exacerbations in the COPE study received open FP treatment for safety reasons most times already before the first follow-up visit, and this may have lead to dilution of the effect on HRQL. We did not find relevant differences in the Eurol-5D visual analogue scale score within and between treatment groups, a finding concordant with the view that a global assessment of patients' health underestimates the impact of airways disease on patients' perceived health (32). Further research is needed to analyze the clinical intangible factors of sensitivity to ICS as it is still not well understood why patients with COPD would benefit from ICS. In addition it should be stressed that patients treated at a chest clinic in the Netherlands may have another manifestation of COPD compared with those treated by the general practitioner. This should lead to caution in extrapolating the results of this study to the group of patients with COPD treated in primary care. A hypothetical explanation for ICS sensitivity could be the inclusion of patients with COPD who also have asthma features. Although patients with a history of asthma or reversible bronchial obstruction were excluded, some patients might have hidden asthma-like characteristics and thus were probably prone to develop an exacerbation after discontinuation of FP. In this context it might be relevant that the subgroup experiencing rapid recurrent exacerbations had slightly more advanced disease before enrollment. Our study demonstrated that discontinuation of high doses of FP in patients with moderate to severe COPD induced a more rapid onset and higher recurrence-risk of exacerbations. However, as 40% of the patients have no untoward effect from the withdrawal of ICS there is an urgent need to identify which subgroup of patients with COPD patients responds well to prolonged ICS therapy. Moreover, there is need for further studies to investigate the efficacy and safety of long-term use of ICS for the management of COPD.
The authors gratefully acknowledge all members of the Department of Pulmonary Medicine and especially the technicians of the lung function laboratory and the data managers Betty Rinsma and Petra Meerlo.
The COPE study was sponsored by the Netherlands Asthma Foundation, Amicon Health Insurance Co., Boehringer Ingelheim, and GlaxoSmithKline BV. Part of the results of this study were presented at the annual meeting of the European Respiratory Society in Berlin, Germany in September 2001 and at the annual meeting of the American Thoracic Society, Atlanta in May 2002. Received in original form June 5, 2002; accepted in final form August 31, 2002
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ABSTRACT
INTRODUCTION
–level test (
