Abstract
Background: The efficacy and safety of complement inhibition in COVID-19 patients is unclear.
Methods: A multicenter randomized controlled, open-label trial. Hospitalized COVID-19 patients with signs of systemic inflammation and hypoxemia (PaO 2 /FiO 2 below 350 mmHg) were randomized (2:1 ratio) to receive standard of care with or without the C5 inhibitor zilucoplan daily for 14 days, under antibiotic prophylaxis. The primary outcome was improvement in oxygenation at day 6 and 15.
Results: 81 patients were randomly assigned to zilucoplan (n = 55) or the control group (n = 26). 78 patients were included in the safety and primary analysis. Most were men (87%) and the median age was 63 years. The mean improvement in PaO 2 /FiO 2 from baseline to day 6 was 56.4 mmHg in the zilucoplan group and 20.6 mmHg in the control group (mean difference + 35.8; 95% confidence interval (CI) – 9.4 to 80.9; p = 0.12), an effect also observed at day 15. Day 28 mortality was 9% in the zilucoplan and 21% in the control group (odds ratio 0.4; 95% CI 0.1 to 1.5). At long-term follow up, the distance walked in a 6-min test was 539.7 m in zilucoplan and 490.6 m in the control group (p = 0.18). Zilucoplan lowered serum C5b-9 (p < 0.001) and interleukin-8 (p = 0.03) concentration compared with control. No relevant safety differences between the zilucoplan and control group were identified.
Conclusion: Administration of zilucoplan to COVID-19 patients in this proof-of-concept randomized trial was well tolerated under antibiotic prophylaxis. While not reaching statistical significance, indicators of respiratory function (PaO 2 /FiO 2 ) and clinical outcome (mortality and 6-min walk test) suggest that C5 inhibition might be beneficial, although this requires further research in larger randomized studies.
Trial registration: ClinicalTrials.gov NCT04382755 .
Keywords: COVID-19; Complement 5; Complement system; Systemic inflammation.
【저자키워드】 COVID-19, complement system, systemic inflammation., Complement 5, 【초록키워드】 Inflammation, Mortality, Trial, Open-label, zilucoplan, Respiratory function, randomized trial, complement, Clinical outcome, Randomized, serum, Hypoxemia, Research, Patient, age, Efficacy and safety, systemic inflammation, multicenter, inhibitor, Concentration, Odds ratio, COVID-19 patient, Oxygenation, systemic, Standard of care, Antibiotic prophylaxis, Primary outcome, control group, 95% CI, 95% confidence interval, statistical significance, mean difference, primary analysis, while, MOST, men, long-term follow up, Randomly, randomized studies, Day, assigned, receive, baseline, PaO, the median, 【제목키워드】 Randomized controlled trial, Open-label, complement, inhibitor, patients hospitalized,