Subcutaneous REGEN-COV Antibody Combination to Prevent Covid-19

O'Brien et al., NEJM, doi:10.1056/NEJMoa2109682 (press release 4/12/21), NCT04452318, Apr 2021
ProphylaxisRCT · 1,505 patients · multinational · Jul 2020 – Jan 2021
Casirivimab/i.. for COVID-19
Fewer symptomatic cases and faster recovery
p < 0.0001 (Fewer symptomatic cases) and p = 0.0001 (recovery)

Casirivimab/imdevimab for COVID-19

18th treatment shown to reduce risk in March 2021, now with p = 0.000095 from 34 studies, recognized in 52 countries. Efficacy is variant dependent.

No treatment is 100% effective.
Protocols combine treatments.

Prophylaxis trial reporting lower hospitalization/ER and symptomatic cases, and faster recovery with 1,200mg subcutaneous casirivimab with imdevimab. The same trial has updated results available in1. NCT04452318 (history).
Efficacy is variant dependent. In Vitro research suggests a lack of efficacy for many omicron variants2-8.
OutcomeImprovementEffect · pTreatmentControl
risk of hospitalization/ER 88.9% lower · RR 0.11 · p = 0.06 88.9% lowerRR 0.11p = 0.06 0 of 753 (0.0%) 4 of 752 (0.5%) treatment 0 of 753 (0.0%), control 4 of 752 (0.5%)day 29NNT 188continuity correction due to zero events
risk of symptomatic case 81.4% lower · RR 0.19 · p < 0.001*** 81.4% lowerRR 0.19p < 0.001*** 11 of 753 (1.5%) 59 of 752 (7.8%) treatment 11 of 753 (1.5%), control 59 of 752 (7.8%)day 29NNT 16
recovery time 62.5% lower · relative time 0.37 · p < 0.0001*** 62.5% lowerrelative time 0.37p < 0.0001*** 753 752 treatment 753, control 752relative time with symptoms
time to viral- 69.2% lower · relative time 0.31 · p < 0.0001*** 69.2% lowerrelative time 0.31p < 0.0001*** 753 752 treatment 753, control 752relative time with high viral load

Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates. *** p < 0.001

O'Brien et al., 12 Apr 2021, Double Blind Randomized Controlled Trial, multiple countries, peer-reviewed, 36 authors, study period 13 July, 2020 - 28 January, 2021, trial NCT04452318 (history).
Subcutaneous REGEN-COV Antibody Combination to Prevent Covid-19
Meagan P O’brien, Eduardo Forleo-Neto, Bret J Musser, Flonza Isa, Kuo-Chen Chan, Neena Sarkar, Katharine J Bar, Ruanne V Barnabas, Dan H Barouch, Myron S Cohen, Christopher B Hurt, Dale R Burwen, Mary A Marovich, Peijie Hou, Ingeborg Heirman, John D Davis, Kenneth C Turner, Divya Ramesh, Adnan Mahmood, Andrea T Hooper, Jennifer D Hamilton, Yunji Kim, Lisa A Purcell, Alina Baum, Christos A Kyratsous, James Krainson, Richard Perez-Perez, Rizwana Mohseni, Bari Kowal, A Thomas Dicioccio, Neil Stahl, Leah Lipsich, Ned Braunstein, Gary Herman, George D Yancopoulos, David M Weinreich
New England Journal of Medicine, doi:10.1056/nejmoa2109682
BACKGROUND REGEN-COV (previously known as REGN-COV2), a combination of the monoclonal antibodies casirivimab and imdevimab, has been shown to markedly reduce the risk of hospitalization or death among high-risk persons with coronavirus disease 2019 (Covid-19). Whether subcutaneous REGEN-COV prevents severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and subsequent Covid-19 in persons at high risk for infection because of household exposure to a person with SARS-CoV-2 infection is unknown. METHODS We randomly assigned, in a 1:1 ratio, participants (≥12 years of age) who were enrolled within 96 hours after a household contact received a diagnosis of SARS-CoV-2 infection to receive a total dose of 1200 mg of REGEN-COV or matching placebo administered by means of subcutaneous injection. At the time of randomization, participants were stratified according to the results of the local diagnostic assay for SARS-CoV-2 and according to age. The primary efficacy end point was the development of symptomatic SARS-CoV-2 infection through day 28 in participants who did not have SARS-CoV-2 infection (as measured by reverse-transcriptasequantitative polymerase-chain-reaction assay) or previous immunity (seronegativity). RESULTS Symptomatic SARS-CoV-2 infection developed in 11 of 753 participants in the REGEN-COV group (1.5%) and in 59 of 752 participants in the placebo group (7.8%) (relative risk reduction [1 minus the relative risk], 81.4%; P<0.001). In weeks 2 to 4, a total of 2 of 753 participants in the REGEN-COV group (0.3%) and 27 of 752 participants in the placebo group (3.6%) had symptomatic SARS-CoV-2 infection (relative risk reduction, 92.6%). REGEN-COV also prevented symptomatic and asymptomatic infections overall (relative risk reduction, 66.4%). Among symptomatic infected participants, the median time to resolution of symptoms was 2 weeks shorter with REGEN-COV than with placebo (1.2 weeks and 3.2 weeks, respectively), and the duration of a high viral load (>10 4 copies per milliliter) was shorter (0.4 weeks and 1.3 weeks, respectively). No dose-limiting toxic effects of REGEN-COV were noted. CONCLUSIONS Subcutaneous REGEN-COV prevented symptomatic Covid-19 and asymptomatic SARS-CoV-2 infection in previously uninfected household contacts of infected persons. Among the participants who became infected, REGEN-COV reduced the duration of symptomatic disease and the duration of a high viral load. (Funded by Regeneron Pharmaceuticals and others; ClinicalTrials.gov number, NCT04452318.
Appendix The authors' full names and academic degrees are as follows: Meagan P. O'Brien, M.D., Eduardo Forleo-Neto, M.D., Bret J. Musser, Ph.D., Flonza Isa, M.D., Kuo-Chen Chan, Ph.D., Neena Sarkar, Ph.D., Katharine J. Bar
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DOI record: { "DOI": "10.1056/nejmoa2109682", "ISSN": [ "0028-4793", "1533-4406" ], "URL": "http://dx.doi.org/10.1056/NEJMoa2109682", "alternative-id": [ "10.1056/NEJMoa2109682" ], "author": [ { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "O’Brien", "given": "Meagan P.", "sequence": "first" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Forleo-Neto", "given": "Eduardo", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Musser", "given": "Bret J.", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Isa", "given": "Flonza", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. 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Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Turner", "given": "Kenneth C.", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Ramesh", "given": "Divya", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. 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Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Hooper", "given": "Andrea T.", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. 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Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Kim", "given": "Yunji", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Purcell", "given": "Lisa A.", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Baum", "given": "Alina", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Kyratsous", "given": "Christos A.", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Krainson", "given": "James", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Perez-Perez", "given": "Richard", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Mohseni", "given": "Rizwana", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Kowal", "given": "Bari", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "DiCioccio", "given": "A. 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Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Braunstein", "given": "Ned", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. Stahl, L.L., N.B., G.H., G.D.Y., D.M.W.); the Departments of Medicine and Microbiology, University of Pennsylvania, Philadelphia (K.J.B.); the Departments of Global Health and Epidemiology and the Division of Allergy and Infectious Diseases, University of Washington, and the Vaccine and Infectious Diseases..." } ], "family": "Herman", "given": "Gary", "sequence": "additional" }, { "affiliation": [ { "name": "From Regeneron Pharmaceuticals, Tarrytown, NY (M.P.O., E.F.-N., B.J.M., F.I., K.-C.C., N. Sarkar, P.H., I.H., J.D.D., K.C.T., D.R., A.M., A.T.H., J.D.H., Y.K., L.A.P., A.B., C.A.K., B.K., A.T.D., N. 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