The ITT population comprised 1810 patients (FF/UMEC/VI, n = 911; BUD/FOR, n = 899). The EXT population included the first 430 of these patients who consented to receive treatment for 52 weeks (FF/UMEC/VI, n = 210; BUD/FOR, n = 220) (Fig. 1). The full population characteristics are shown in Table S1 in the online data supplement, as reported in the primary publication [13]. Baseline demographics and PRO scores were similar between treatment arms in both the ITT and EXT populations, and between the ITT and EXT populations (Table 2) [13]. COPD maintenance medication taken at screening was comparable between treatment arms and the ITT and EXT populations (Table S2).
Table 2 Patient characteristics at baseline (ITT and EXT populations)
Symptom Assessments
Over 24 weeks (ITT), FF/UMEC/VI produced greater reductions from baseline in mean E-RS: COPD total score and all subscale scores compared with BUD/FOR; treatment differences were statistically significant for each 4-week interval and in the FF/UMEC/VI group exceeded the total score response threshold by week 8. Breathlessness and cough and sputum subscales in this group exceeded the threshold by week 12 (Fig. 2). The between-treatment odds ratios (ORs) of response versus non-response over 24 weeks (ITT) were statistically significant in favor of FF/UMEC/VI (OR range over 24 weeks, 1.59–1.76; all P < 0.001). At weeks 21–24 (ITT) for FF/UMEC/VI versus BUD/FOR, 53 and 42% of patients responded, respectively, and the number needed to treat to benefit (NNTB) was 9 (95% CI 7–17). Similar findings were observed for OR response versus not response at each 4-week interval over 52 weeks in the EXT population [Table S23 in the online data supplement; proportion of responders: 42 and 32% for FF/UMEC/VI and BUD/FOR, respectively; NNTB of 10 (95% CI 5–77)].
FF/UMEC/VI also demonstrated statistically significant improvements in dyspnea, measured by mean TDI focal score, compared with BUD/FOR at weeks 4 and 24 in the ITT population (Table 3). Between-treatment ORs of response versus non-response at weeks 4 and 24 (ITT) were statistically significant in favor of FF/UMEC/VI [week 4 OR (95% CI): 1.52 (1.25–1.86), P > 0.001; week 24 OR (95% CI): 1.61 (1.33–1.95), P < 0.001]. At week 24 (ITT), 61 and 51% of patients responded on FF/UMEC/VI and BUD/FOR, respectively, and the NNTB was 10 (95% CI 7–18). In the EXT population at week 52, there was no evidence of benefit, the OR was 1.35 (P = 0.1.32) and 53 and 46% responded, respectively. The mean TDI focal score showed numeric improvement with FF/UMEC/VI compared with BUD/FOR at weeks 4, 24, and 52 (EXT) but only achieved statistical significance at week 4 (P = 0.01). However, the ratio between treatments of odds of response versus non-response for the E-RS: COPD Breathlessness Score for each 4-weekly period in the EXT population ranged from 1.60 to 2.32 (all P < 0.05). The observed improvements in symptom scores were independent of baseline COPD medication.
Table 3 Analysis of TDI focal scores and proportion of TDI responders in the ITT and EXT populations
A statistically significant reduction in mean number of occasions of rescue medication use per day was demonstrated with FF/UMEC/VI versus BUD/FOR over weeks 1–24 (ITT) and weeks 1–52 (EXT) (Table 4). Similar findings were observed at each 4-week time period (Table 4).
Table 4 Treatment difference in rescue medication use for FF/UMEC/VI vs BUD/FOR, in the ITT and EXT populations
HRQoL Assessments
In the ITT population at weeks 4 and 24, clinically meaningful improvements from baseline in CAT score (reduction ≥ 2) were observed with FF/UMEC/VI (mean change from baseline: week 4, − 1.7; week 24, − 2.7), but not with BUD/FOR (mean change from baseline: week 4, − 1.4; week 24, − 1.7). The treatment differences of − 0.7 and − 0.9 units, respectively, were statistically significant (Fig. 3). In the smaller EXT population, improvements from baseline were also observed at weeks 4, 24, and 52 with both treatments, numerically in favor of FF/UMEC/VI, but the treatment difference was only statistically significant at week 24 (P = 0.035). The OR of response versus non-response at week 24 (ITT) was statistically significant in favor of FF/UMEC/VI versus BUD/FOR (OR 1.44, P < 0.001). At week 24 (ITT), 53 and 45% of patients receiving FF/UMEC/VI or BUD/FOR responded, respectively, and the NNTB was 11 (95% CI 8–29). At week 52 (EXT), the OR was 1.50 (P = 0.048) and the proportions of responders were 44 versus 35%, respectively, [NNTB, 11 (95% CI 5–459)]. Similar findings were observed in SGRQ analyses. At week 24 (ITT), the OR of response versus non-response was statistically significant in favor of FF/UMEC/VI versus BUD/FOR (OR 1.41, P < 0.001). At week 24 (ITT), 50 and 41% of patients receiving FF/UMEC/VI or BUD/FOR responded, respectively, and the NNTB was 12 (95% CI 8–27). At week 52 (EXT), the OR was 1.50 (P = 0.046) and the proportions of responders were 44 versus 33%, respectively (NNTB, 10 [95% CI 5–97]).
Improvements from baseline in SGRQ domain scores were observed in both treatment groups in the ITT population in line with changes in the total score [13], with significantly greater improvements observed with FF/UMEC/VI across all domain scores compared with BUD/FOR at weeks 4 and 24 (Fig. 4). Improvements from baseline in SGRQ domain scores were also observed in both treatment groups at weeks 4, 24, and 52 in the EXT population numerically in favor of FF/UMEC/VI at all time points, except for Symptoms and Impacts domains at week 4 (Table S3 in the online data supplement).
The FF/UMEC/VI group had significantly greater odds of being in a better versus a worse response category for patient-rated Global Rating of Change in COPD Severity from baseline at week 24 (ITT) compared with BUD/FOR [ordered OR 1.63; 95% confidence interval (CI) 1.37–1.95] and at week 52 (EXT) population (ordered OR 2.08; 95% CI 1.42–3.06). All HRQoL findings were observed independent of baseline COPD medication. The relationship between SGRQ and CAT scores was explored post hoc using individual patient data and demonstrated a positive correlation between the changes from baseline in SGRQ total score and in CAT score at week 24 in the ITT population (Fig. 5).
Activity Limitation and Inhaler Preference
At baseline, most patients reported some level of COPD-related limitation in activity, with similar proportions in each arm reporting slightly limited or limited activity and only a few patients reporting the extremes of no limitation or very limited activity.
At weeks 24 (ITT population) and 52 (EXT population), compared with baseline, more patients treated with FF/UMEC/VI reported improved activity limitation (‘not limited’ and ‘slightly limited’ categories) on the Global Rating of Activity Limitation (13 and 15% increases) compared with BUD/FOR (5% increases at each week).
Patients receiving FF/UMEC/VI had statistically significantly greater odds of being in a better response category versus a worse category for Change in Global Activity Limitation than those treated with BUD/FOR at week 24 (ITT) (ordered OR 1.58; 95% CI 1.33–1.89) and week 52 (EXT) (ordered OR 2.15; 95% CI 1.46–3.16).
Responses to the daily activity question were not easily interpreted as only 5% (approximately) of patients in each group reported an improvement in the number of days they were able to perform more activities than usual. At baseline in both the ITT and EXT populations, the majority of patients in each treatment arm (55–58%) reported a score of 1 (no effect on activities) and approximately 40% reported a score of 0 (fewer activities than normal).
At the final study visit (week 24, ITT population), of those patients who expressed a preference, more preferred the ELLIPTA® inhaler to the Turbuhaler® (Table 5).
Table 5 Inhaler preferences at week 24 (n = 1810; ITT population)