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0 0.5 1 1.5 2+ Mortality 92% Improvement Relative Risk Oxygen therapy 94% Casirivimab/i..  Faraone et al.  EARLY TREATMENT Is early treatment with casirivimab/imdevimab beneficial for COVID-19? Retrospective 34 patients in Italy (October 2020 - April 2021) Lower mortality (p=0.034) and lower oxygen therapy (p=0.017) Faraone et al., Research Square, May 2022 Favors casirivimab/im.. Favors control

REGEN-COV antibody cocktail (casirivimab/imdevimab) for the treatment of inpatients with early hospital-acquired COVID-19: a single center experience

Faraone et al., Research Square, doi:10.21203/
May 2022  
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17th treatment shown to reduce risk in March 2021
*, now known with p = 0.0000087 from 27 studies, recognized in 42 countries. Efficacy is variant dependent.
No treatment is 100% effective. Protocols combine complementary and synergistic treatments. * >10% efficacy in meta analysis with ≥3 clinical studies.
3,800+ studies for 60+ treatments.
Retrospective 34 patients with hospital-acquired COVID-19, showing lower mortality and oxygen requirements with early casirivimab/imdevimab treatment.
Efficacy is variant dependent. In Vitro research suggests a lack of efficacy for many omicron variants Haars, Liu, Pochtovyi, Sheward, Tatham, VanBlargan.
risk of death, 92.2% lower, RR 0.08, p = 0.03, treatment 0 of 11 (0.0%), control 8 of 23 (34.8%), NNT 2.9, relative risk is not 0 because of continuity correction due to zero events (with reciprocal of the contrasting arm).
risk of oxygen therapy, 94.5% lower, RR 0.06, p = 0.02, treatment 0 of 11 (0.0%), control 15 of 23 (65.2%), NNT 1.5, odds ratio converted to relative risk, relative risk is not 0 because of continuity correction due to zero events (with reciprocal of the contrasting arm).
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Faraone et al., 5 May 2022, retrospective, Italy, preprint, 12 authors, study period 25 October, 2020 - 30 April, 2021, average treatment delay 2.3 days. Contact:
This PaperCasirivimab/i..All
REGEN-COV antibody cocktail (casirivimab/imdevimab) for the treatment of inpatients with early hospital-acquired COVID-19: a single center experience
Antonio Faraone, Francesca Fabbrizzi, Tommaso Picchioni, Elena Lovicu, Lorenzo Tofani, Giulia Scocchera, Aldo Lo Forte, Andrea Crociani, Paolo Carrai, Serena Sbaragli, Michael Bettucchi, Alberto Fortini
Inpatients with hospital-acquired (HA) COVID-19 have mortality rates above 30%. Subjects with early diagnosis of COVID-19 and risk factors for disease progression are suitable for treatment with anti-SARS-CoV-2 neutralizing monoclonal antibodies (mAbs). We retrospectively assessed the outcome of a cohort of hospitalized patients with laboratory con rmed SARS-CoV-2 nosocomial infection who were admitted to the COVID-19 general ward of an acute-care Italian hospital between October 25, 2020 and April 30, 2021. Patients receiving the REGEN-COV mAb cocktail (casirivimab/imdevimab) were compared with those receiving standard care. Of 34 patients, 11 (mean age, 73.1; 9 males) underwent treatment with REGEN-COV and 23 received standard care. The 2 study groups were well balanced regarding age, sex, comorbidities, acute illness severity at diagnosis of SARS-CoV-2 infection, and all participants had at least 2 risk factors for disease progression. Five of 11 patients in the REGEN-COV group and 16 of 23 in the standard care group were asymptomatic at diagnosis; the remaining had symptoms of mild COVID-19. All patients received REGEN-COV within 3 days of infection con rmation. Treatment with REGEN-COV was inversely associated with oxygen requirement for COVID-19 during hospital stay (OR 0.02, CI 0-0.52, p=0.0174). No 28-day deaths were registered in the REGEN-COV group, compared to 8 (34.8%) in the standard care group (p=0.0339). Kaplan-Meier analysis con rmed the survival advantage of REGEN-COV group (log-rank p=0.00324). No serious adverse events related to REGEN-COV administration were recorded. Based on these ndings, REGEN-COV appears safe and might prevent disease progression in high-risk inpatients with early diagnosis of HA-COVID-19.
Author contributions All authors contributed to the study conception and design. Material preparation and data collection were performed by T Picchioni, E Lovicu, G Scocchera, A Lo Forte, A Crociani, P Carrai, S Sbaragli, M Bettucchi. Data analysis was conducted by A Faraone and L Tofani. The rst draft of the manuscript was written by A Faraone, F Fabbrizzi and A Fortini and all authors commented on previous versions of the manuscript. All authors read and approved the nal manuscript. Ethical standards The study was approved by the institutional review board of the Department of Medicine of the "Azienda USL Toscana Centro", Florence, Italy. All procedures were performed in accordance with the 1964 Helsinki declaration and its later amendments. Due to the retrospective nature of the study, informed consent was weaved according to the applicable local law. Data were de-identi ed to preserve the anonymity of participants.
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