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c19early.org COVID-19 treatment researchConestat alfaConestat alfa (more..)
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0 0.25 0.5 0.75 1 1.25 1.5 1.75 2+ Bernstein (SB RCT) 78% 0.22 [0.01-5.13] death 0/27 1/11 Improvement, RR [CI] Treatment Control PROTECT-COVID-19 Urwyler (RCT) -238% 3.38 [0.44-26.1] death 7/56 1/27 Tau​2 = 1.86, I​2 = 50.5%, p = 0.93 Late treatment -14% 1.14 [0.08-15.4] 7/83 2/38 14% higher risk All studies -14% 1.14 [0.08-15.4] 7/83 2/38 14% higher risk 2 conestat alfa COVID-19 studies c19early.org November 2025 Tau​2 = 1.86, I​2 = 50.5%, p = 0.93 Effect extraction pre-specified(most serious outcome) Favors conestat alfa Favors control
Conestat alfa is a recombinant human C1 esterase inhibitor (rhC1-INH), an intravenous anti-inflammatory drug with the potential to inhibit the complement and kallikrein-kinin cascades in severe COVID-19. Recent:
Urwyler.
Oct 27
2023
Urwyler et al., Frontiers in Immunology, doi:10.3389/fimmu.2023.1255292 Recombinant C1 inhibitor in the prevention of severe COVID-19: a randomized, open-label, multi-center phase IIa trial
238% higher mortality (p=0.26), 286% higher ventilation (p=0.26), 141% higher ICU admission (p=0.32), and 117% lower hospital discharge (p=0.12). RCT 84 hospitalized COVID-19 patients showing higher mortality with conestat alfa (recombinant C1 inhibitor), without reaching statistical significance.
Dec 1
2021
Bernstein et al., NCT04530136 Recombinant Human C1 Esterase Inhibitor (Ruconest®) in the Prevention of Severe SARS-CoV-2 Infection in Hospitalized Patients With COVID-19: a Randomized, Parallel-group, Open-label, Multi-center Pilot Trial in the US
78% lower mortality (p=0.29), 87% lower ventilation (p=0.08), 46% lower progression (p=0.07), and 52% shorter hospitalization (p=0.06). RCT 38 hospitalized COVID-19 patients showing non-significant improvements with conestat alfa. Results of this manufacturer RCT are notably better than the non-manufacturer RCT [Urwyler].
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