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From Meltola Hospital (Drs. Pietinalho and Selroos), Karjaa, Finland; the Departments of Pulmonary Medicine (Dr. Tukiainen) and Allergic Diseases (Dr. Haahtela), University Central Hospital, Helsinki, Finland; and AstraZeneca R&D (Drs. Persson and Selroos), Lund, Sweden.
A complete list of the members of the Finnish Sarcoidosis Study group
is given in the Appendix.
Correspondence to: Olof Selroos, MD, FCCP, AstraZeneca R&D, S-221 87 Lund, Sweden; e-mail: olof.selroos{at}astrazeneca.com
| Abstract |
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Design: Randomized, double-blind, placebo-controlled, parallel-group study for 18 months. Thereafter, open follow-up without treatment.
Setting: Twenty pulmonary medicine departments in Finland.
Patients: One hundred eighty-nine adult patients, most of them with normal lung function, were randomized to treatment. One hundred forty-nine patients were followed up for 5 years: 79 patients with initial stage I disease and 70 patients with stage II disease.
Treatment: Oral prednisolone for 3 months followed by inhaled budesonide for 15 months (800 µg bid), or placebo tablets followed by placebo inhaler therapy. Thereafter, treatment only on an individual basis in the case of clinical deterioration.
Measurements: Yearly follow-up visits with chest radiographs, lung function tests (FEV1, FVC), diffusion capacity of the lung for carbon monoxide (DLCO), serum angiotensin-converting enzyme (SACE), and serum and urinary calcium measurements.
Results: No initial differences were observed in chest radiographic findings between the active-treatment and placebo-treatment groups, either in patients with initial stage I or stage II(-III) disease. However, after the 5-year follow-up, 18 steroid-treated patients (26%) and 30 placebo-treated patients (38%) still had remaining chest radiographic changes. Placebo-treated patients more frequently required treatment with corticosteroids during the 5-year follow-up (p < 0.05). Steroid-treated patients with initial stage II(-III) disease improved more in FVC and DLCO (p < 0.05). No differences in reported adverse events or in SACE, serum calcium, or urinary calcium values were seen.
Conclusion: Immediate treatment of pulmonary stage II(-III) sarcoidosisbut not stage I diseaseimproved the 5-year prognosis with regard to lung function variables.
Key Words: angiotensin-converting enzyme budesonide chest radiograph glucocorticosteroids inhalation lung function prednisolone prognosis sarcoidosis
| Introduction |
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One reason why in many studies the prognosis of corticosteroid-treated patients has been no different from untreated or placebo-treated patients could be that the included patients have had their disease for many years and irreversible changes unresponsive to treatment have already developed. That was the reason why we decided to study patients with newly detected pulmonary sarcoidosis, with the aim to investigate whether early treatment could influence the long-term prognosis. Our study therefore included well-defined patients with stage I or stage II pulmonary sarcoidosis with symptoms or signs of sarcoidosis for < 3 months.5 However, symptoms were not a prerequisite, as symptom-free patients could be included. The study started with an 18-month treatment period consisting of prednisolone for 3 months (20 mg/d for 8 weeks, 15 mg/d for 2 weeks, and 10 mg/d for 2 weeks) followed by inhaled budesonide for 15 months (800 µg bid) delivered via Turbuhaler (Astra Zeneca Production; Södertälje, Sweden), or placebo tablets for 3 months followed by placebo inhaler therapy. The results of the treatment phase, previously reported,5 showed significant radiographic improvement for the first 6 months of treatment in stage I patients but not in stage II patients. In patients with initial stage I disease, no significant treatment differences were found for lung function test results or in tests for markers of disease activity. In stage II patients, diffusing capacity of the lung for carbon monoxide (DLCO) and serum angiotensin-converting enzyme (SACE) were significantly better at 18 months for the active-treatment group compared with the placebo-treatment group.
The reason why early treatment was considered ethical in all patients with newly detected pulmonary sarcoidosis even in the absence of symptoms or reduced lung function was the fact that the treatment administered was inhaled budesonide, which has a much improved safety profile compared with oral glucocorticosteroids.6 Inhaled budesonide provides sufficient tissue concentrations to produce an anti-inflammatory response as previously reported.7 The aim of this 5-year follow-up study was to investigate whether early treatment for 18 months had an influence on the long-term prognosis of patients with stage I and stage II pulmonary sarcoidosis irrespective of the initial lung function values of the patients.
| Materials and Methods |
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Patients
The 18-month treatment phase included 189 randomized patients of
both genders and
18 years old. They had newly detected (diagnosed
within 3 months from the first symptoms or signs) radiographic stage I
disease (bilateral hilar lymphadenopathy; n = 94) or stage II disease
(parenchymal infiltrates with hilar lymphadenopathy; n = 84). Eleven
patients were later reclassified as having had stage III disease
(parenchymal infiltrates without hilar lymphadenopathy; n = 11) at
the time of randomization. At baseline, normal lung function was seen
in the majority of the patients. Only 23 patients had a FVC < 80% of
predicted and 12 patients had a DLCO < 75% of predicted
normal values. Ninety-two patients had been randomized to treatment
with prednisolone followed by budesonide, and 97 patients were
randomized to receive placebo. As previously reported, 154 patients
completed the randomized, double-blind treatment phase5
and could be included in the follow-up study. The flowchart of patients
with data from randomization to the end of the 5-year follow-up period
is shown in Figure 1
separately for steroid-treated and placebo-treated stage I and stage II
patients (the latter including the reclassified stage III patients).
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In the case of deterioration or relapse, individually adjusted treatments could be started during the follow-up. The type and length of treatments were recorded. At the clinic visits, patients were asked questions about adverse events.
Ethical Requirements and Good Clinical Practice
Ethics committees at each study center approved the study,
including the 5-year follow-up, before any study-related procedures
were undertaken. Clinical research nurses of Meltola Hospital and one
of the investigators (A.P.) monitored the follow-up study.
Data Management and Statistical Analysis
All data were entered at Meltola Hospital, the coordinating
center, into a New Mathematical Statistics Package 5.0x database. The
5-year data were analyzed using New Mathematical Statistics Package
5.05 (Firma NMSP Statistik program; Lund, Sweden). The results
were analyzed based on an all-patient-treated approach. A "last value
extended" principle was used when data from the 24-month or later
visits were available but not from the last visit.
For statistical comparisons, t tests and analysis of
variance were used. Separate analyses were performed to investigate the
influence of the initial stages (I or II) on the outcome. The
radiographic stages were analyzed by a stratified Wilcoxon test with
strata according to stage at visit 1 (randomization visit). The stage
was also analyzed by two-way analysis of variance with treatment and
center as well as their interactions as factors. In all presentations
of statistical tests results, a significant result refers to p values
5% (p < 0.05).
| Results |
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Radiographic Findings
Table 1
shows the distribution of chest radiographic findings after the initial
18-month treatment phase and 5 years after randomization in 79 patients
with initial stage I and 70 patients with initial stage II(-III)
disease. In stage I disease, 31 of 39 patients in the steroid-treated
group and 27 of 40 patients in the placebo group showed normal chest
radiographic findings. Parenchymal lesions developed in six patients in
each group. No statistically significant difference was found between
the groups.
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Lung Function Tests
The baseline values used in the following comparisons are the
values of those patients followed up for 5 years. The mean baseline
values therefore differ slightly from the mean values given in the
previous publication.5
For stage I disease patients, no statistically significant differences were seen for FVC or DLCO between steroid-treated and placebo-treated patients (Table 2 ). For patients with initial stage II(-III) disease, the treatment effects were different (Table 3 ). In the corticosteroid-treated group, a mean increase in FVC of 0.33 L was observed at 18 months and this level was almost maintained at 5 years. In the placebo group, no change in FVC was seen over time. At both time points (18 months, 5 years), the difference in change in FVC between corticosteroid-treated and placebo-treated patients was statistically significant (p = 0.018 and p = 0.024, respectively). For DLCO, a mean increase was observed over time in the corticosteroid-treated group, whereas a mean decrease was seen in the placebo group. Also this difference in change over time was statistically significant (18 months, p = 0.034; 5 years, p = 0.028).
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On the whole, the mean increases in FVC and DLCO in the corticosteroid-treated group are modest. The mean results are, however, a consequence of the selection procedure, with most included patients having a completely normal lung function at randomization. For individual patients with an initially impaired lung function, the improvements in lung function tests are considered clinically important.
Laboratory Test Values
The mean SACE and serum calcium levels as well as urinary calcium
values obtained at baseline, after 18 months of treatment, and after 5
years of follow-up are shown in Tables 2
, 3
for initial stage I and
stage II(-III) patients, respectively. No statistically significant
differences were found between the groups.
Discontinuations and Treatments Administered During the Follow-up
After the 18-month treatment period, five patients never entered
the follow-up phase. During the follow-up phase, corticosteroids had to
be administered to 16 patients initially treated with placebo. In two
patients initially treated with steroids, treatment had to be
reinstituted because of a clinical relapse (Fig 2
). The difference in frequencies between the groups in starting steroid
treatment during the follow-up period was statistically significant
(
2 = 12.17; p < 0.001).
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2 = 10.49; p < 0.001).
Adverse Events
No serious adverse events were reported during the follow-up, and
there were no discontinuations of the follow-up because of adverse
events.
| Discussion |
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Although initial improvements are seen, many controlled clinical studies have failed to demonstrate a persisting difference in lung function tests and radiographic appearance between corticosteroid-treated and untreated patients.14 15 The opinion has therefore often been expressed that corticosteroids do not alter the course of the disease and that treatment should be used only for relief of symptoms.2 However, the opposite opinion also exists: corticosteroids should be administered with the aim of preventing irreversible fibrosis to patients with pulmonary infiltrates and active disease regardless of the presence or absence of symptoms.16 17 Indeed, a number of clinical trials14 17 18 19 20 21 have clearly shown a beneficial effect of corticosteroid treatment compared with untreated or placebo-treated patients. The reason for the discrepancy in results between studies may be differences in patient populations, ethnic backgrounds, duration of disease with differences in the rates of spontaneous recoveries, and differences in study protocols, doses, and duration of treatment.
There are data to suggest that corticosteroids can impact on mechanisms
important in the early stage of the pathogenic process. A number of
genes, which play a role in the pathogenesis of sarcoidosis, can be
modulated by corticosteroids. These genes are expressed soon after
antigen triggering of CD4+ T cells and they include interleukin (IL)-2,
interferon-
, IL-1, and the IL-2 receptor, IL-2R.22
Other genes play important roles in the pathogenesis by
influencing the expression of cell adhesion molecules (tumor
necrosis factor-
) and leukocyte/monocyte proliferation and
activation (granulocyte macrophage-colony stimulating factor,
granulocyte-colony stimulating factor). They are also regulated by
corticosteroids.22
23
24
25
It could be postulated that early intervention is of importance when treatment is administered in order to suppress an inflammatory and immunologically mediated processes. Therefore, the aim of this study was to include only patients with newly detected pulmonary sarcoidosis, ie, with symptoms or signs of the disease for < 3 months. Patients fulfilling this criterion and with radiographic stage I and stage II lesions were included irrespective of lung function status and presence or absence of symptoms. The results of the 18-month treatment period showed no differences in stage I patients in radiographic development, lung function test results, or levels of biochemical serum markers.5 The frequency of spontaneous improvements in the placebo group was also higher than estimated in the power calculation of the study. However, in patients with initial stage II disease (11 patients were later reclassified as corresponding to stage III), a significant effect was seen in DLCO values and SACE activities.
This 5-year follow-up part of the study demonstrated in patients with initial stage I disease no significant differences between treated and untreated groups in any of the outcome variables. The vast majority of the patients had normal chest radiographic findings and normal lung function. This result confirms previous observations that stage I patients should be followed up without treatment until spontaneous recoveries can be documented. In patients with initial stage II disease, the result was different. Although no significant differences in chest radiographic developments could be detected, the differences in lung function tests were statistically significant. These differences also appear to be clinically relevant, indicating the value of early intervention with corticosteroids. There was no difference in the numbers of patients discontinuing the study during the initial treatment phase in the steroid-treated and the placebo-treated groups, respectively. During the follow-up phase, significantly more patients in the placebo group had to be treated, compared to the patients in the group initially randomized to treatment with prednisolone followed by budesonide. However, these patients treated during the follow-up phase were not excluded from the analysis. Therefore, any bias because of treatment during the study was in favor of placebo-treated patients and thus reducing the observed differences in lung function tests between the groups. However, it should be noted, that all functional abnormalities were smalland even so in patients with stage II diseasemay be because of the short duration of disease (< 3 months) at the start of the study. Consequently, the treatment effects appear to be modest, too, although statistically significant.
It can be argued that treatment with corticosteroid may result in systemic steroid side effects. As many patients will recover spontaneously, an observation period of 6 to 12 months has been advocated.1 The risk with this clinical approach is obviously that the subgroup of patients who require treatment will be treated too late. The treatment regimen used in this trial is therefore important, as the long-term maintenance treatment was inhaled medication with budesonide. The pharmacokinetic data speak in favor of a lung uptake high enough to result in a clinically meaningful anti-inflammatory effect. The metabolism of budesonide results rapidly in inactive metabolites; therefore, the risk of systemic side effects can be virtually eliminated. This means that no risk is taken even if some patients would be treated unnecessarily. Despite a favorable benefit-risk ratio, the cost-effectiveness of such a treatment approach needs further evaluations.
This 5-year follow-up study is the first to clearly demonstrate that early treatment of patients with pulmonary stage II sarcoidosis results in an improved functional outcome as measured by lung volumes and DLCO. Patients with stage I disease should be followed up without treatment.
| Appendix 1 |
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| Acknowledgements |
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| Footnotes |
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Financial support was provided by AstraZeneca, R&D, Lund, Sweden, and AstraZeneca, Finland.
Dr. Persson is a full-time statistician employed by AstraZeneca R&D, Lund, Sweden.
Dr. Selroos, who initiated the study while working as Physician-in-Chief at Meltola Hospital, Finland, has been appointed a medical advisor to AstraZeneca, R&D, Lund, Sweden.
Received for publication May 17, 2000. Accepted for publication June 29, 2001.
| References |
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-Interferon is spontaneously released by alveolar macrophages and lung T lymphocytes in patients with pulmonary sarcoidosis. J Clin Invest 74,1488-1495
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