Primary endpoint:
- RPL554 met the primary endpoint at all doses, showing a statistically significant difference vs. placebo (p<0.001) with absolute changes from baseline >200mL in peak FEV1 after 4 weeks of dosing. No minimum effective dose could be determined.
- This peak bronchodilator effect was observed at the first dose and was sustained over four weeks (p<0.001).
- Statistically significant improvements in average FEV1 over 12 hours were observed at all doses after the first administration, and this effect was sustained over four weeks.
- This study did not demonstrate consistent improvements in trough FEV1.
- Recording of daily COPD symptoms, using E-RS (EXACT-PRO)1, demonstrated a significant improvement in total COPD symptoms (p<0.002), including improvements in breathlessness (p<0.02), chest symptoms (p<0.02), and cough and sputum (p<0.02).
- Strong trend of improvement in SGRQ-C2 of >2.5 units was observed in all dose groups after four weeks.
- Patients’ Global Impression of Change3 indicates that patients felt better on RPL554 compared to placebo (p<0.01).
- RPL554 was well tolerated at all doses with an adverse event profile similar to placebo.
