The
STRIVERDI RESPIMAT clinical development program included three dose-ranging
trials in COPD patients, four dose-ranging trials in asthma patients,
and eight confirmatory trials in patients with COPD.
Dose-ranging trials
The first COPD dose-ranging trial
was a randomized, double-blind, placebo-controlled, single-dose, 5-way
cross-over trial in 36 patients. Results demonstrated dose-related
improvements in forced expiratory volume in one second (FEV1) compared to placebo. The difference in trough FEV1 from placebo for the 2, 5, 10, and 20 mcg doses were
0.07L (95% CI 0.03, 0.11), 0.10L (0.06, 0.14), 0.11L (0.07, 0.15),
and 0.12L (0.08, 0.16), respectively. The second COPD dose-ranging
trial was a 4-week, randomized, double-blind, placebo-controlled,
parallel group trial in 405 patients. Dose-related improvements in
lung function were also seen, with no added benefit of the 20 mcg
dose over the 10 mcg dose (Figure 1). The third COPD dose-ranging
trial was a randomized, double-blind, 4-way cross-over, dose-regimen
trial in 47 patients. Treatment arms included 2 mcg twice-daily,
5 mcg once-daily, 5 mcg twice-daily, and 10 mcg once-daily. There
was no clear difference in treatment effect when comparing twice-daily
dosing to once-daily dosing.
Figure 1 Difference from placebo for
STRIVERDI RESPIMAT for FEV1 AUC0-3hr and trough FEV1 after 4 weeks
Four randomized, double-blind, placebo-controlled
dose-ranging trials were performed in patients with asthma, evaluating
doses from 2 to 20 mcg. Results from patients with asthma were consistent
with results from dose-ranging trials in patients with COPD. STRIVERDI RESPIMAT is not indicated for asthma.
Based upon the results of the
dose-ranging trials, 5 and 10 mcg doses were further evaluated in
the confirmatory COPD trials.
Confirmatory Trials
The eight confirmatory trials in the
STRIVERDI RESPIMAT clinical development program were four pairs of
replicate, randomized, double-blind, placebo-controlled trials in
3533 COPD patients (1281 received the 5 mcg dose, 1284 received the
10 mcg dose):
(i) two replicate, placebo-controlled,
parallel group, 48 week trials (Trials 1 and 2)
(ii) two
replicate, placebo- and active- [formoterol 12 mcg twice-daily] controlled,
parallel group, 48-week trials (Trials 3 and 4)
(iii)
two replicate, placebo- and active- [formoterol 12 mcg twice-daily]
controlled, 6-week cross-over trials (Trials 5 and 6)
(iv)
two replicate, placebo- and active- [tiotropium bromide 18 mcg once-daily]
controlled, 6-week cross-over trials (Trials 7 and 8).
These eight trials enrolled patients
who were 40 years of age or older with a clinical diagnosis of COPD,
a smoking history of at least 10 pack-years, and moderate to very
severe pulmonary impairment (post-bronchodilator FEV1 less than 80% predicted normal [GOLD II – IV] and a post-bronchodilator
FEV1 to FVC ratio of less than 70%).
The majority of the 3104 patients
in the 48-week trials (Trials 1 and 2, Trials 3 and 4) were male (77%),
white (66%) or Asian (32%), with a mean age of 64 years. Mean post-bronchodilator
FEV1 was 1.38 L (GOLD II [50%], GOLD III [40%],
GOLD IV [10%]). Mean beta2-agonist responsiveness
was 15% of baseline (0.16 L). With the exception of other LABAs, all
pulmonary medications were allowed as concomitant therapy (e.g., tiotropium
[24%], ipratropium [25%], inhaled corticosteroids [45%], xanthines
[16%]); patient enrollment was stratified by tiotropium use. In all
four trials, the primary efficacy endpoints were change from pre-treatment
baseline in FEV1 AUC0-3 and trough (pre-dose) FEV1 (after 12 weeks
in Trials 1 and 2; after 24 weeks in Trials 3 and 4).
In all four 48-week trials, STRIVERDI RESPIMAT
5 mcg demonstrated significant improvements in FEV1 AUC0-3hr compared to placebo at week 12 (Table
2) and at week 24. In the four 48-week trials, STRIVERDI RESPIMAT
5 mcg demonstrated significant improvements in trough FEV1 compared to placebo at week 12 (Table 2; 3 of 4 trials)
and at week 24 (4 trials). STRIVERDI RESPIMAT 5 mcg demonstrated a
bronchodilatory treatment effect at 5 minutes after the first dose
with a mean increase in FEV1 compared to placebo
of 0.11L (range: 0.10L to 0.12L). The 10 mcg dose demonstrated no
additional benefit over the 5 mcg dose (data not shown). Patients
treated with STRIVERDI RESPIMAT 5 mcg used less rescue albuterol compared
to patients treated with placebo.
Table 2 Differences from placebo for STRIVERDI RESPIMAT 5
mcg for FEV1 AUC0-3hr and trough FEV1 at week 12| | Difference
from placebo [L] (95% CI) |
|---|
| | FEV1 AUC0-3hr | Trough FEV1 |
|---|
| Trial 1 | 0.16 (0.12, 0.21) | 0.08 (0.04, 0.13) |
| Trial 2 | 0.13 (0.09, 0.18) | 0.03 (-0.01, 0.08) |
| Trial 3 | 0.18 (0.14, 0.22) | 0.08 (0.04, 0.12) |
| Trial 4 | 0.15 (0.11, 0.18) | 0.06 (0.02, 0.10) |
In Trials 1 and 2, serial
spirometric evaluations were performed pre-dose and up to 12 hours
after dosing in a sub-group of 562 patients (201 patients receiving
STRIVERDI RESPIMAT 5 mcg, 192 patients receiving 10 mcg, and 169
patients receiving placebo) after 12 weeks of treatment. Dosing occurred
at approximately the same time of the day in the morning. The spirometric
curves from Trial 1 are displayed in Figure 2.
Figure 2 FEV1 profile for STRIVERDI RESPIMAT 5 mcg and placebo at week 12 (pre-dose
and up to 12 hrs post-dose) (Trial 1)
The bronchodilatory profile of STRIVERDI
RESPIMAT 5 mcg over the 24 hour dosing interval was evaluated in two
pairs of replicate, placebo- and active-controlled, 6 week cross-over
trials in 199 patients (Trials 5 and 6) and 230 patients (Trials 7
and 8) with moderate to very severe COPD. Mean beta2-agonist responsiveness ranged from 14% -21% of baseline (0.18 to
0.22 L). All pulmonary medications were allowed as concomitant therapy
with the exception of other LABAs (all trials) and anti-cholinergics
(Trials 7 and 8). In all four trials, the primary endpoints were change
from pre-treatment baseline in FEV1 AUC0-12hr and FEV1 AUC12-24hr after 6 weeks; although not a primary endpoint,
trough FEV1 was also measured after 6 weeks.
Results are shown in Table 3.
Table 3 Differences from placebo for STRIVERDI RESPIMAT 5
mcg after 6 weeks in cross-over spirometry trials| Difference
from placebo [L] (95% CI) |
| | FEV1 AUC0-12hr | FEV1 AUC12-24 hr | Trough
FEV1 |
| Trial 5 | 0.15 (0.11, 0.18) | 0.11 (0.07, 0.15) | 0.11 (0.06, 0.15) |
| Trial 6 | 0.17 (0.14, 0.21) | 0.12 (0.08, 0.15) | 0.10 (0.05, 0.15) |
| Trial 7 | 0.19 (0.15, 0.23) | 0.13 (0.09, 0.17) | 0.13 (0.10, 0.17) |
| Trial 8 | 0.20 (0.16, 0.23) | 0.15 (0.12, 0.19) | 0.13 (0.10, 0.17) |