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Casirivimab/imdevimab study #3 of 4
3/23 Early treatment study
Regeneron Press Release (Preprint)
New phase III data shows investigational antibody cocktail casirivimab and imdevimab reduced hospitalisation or death by 70% in non-hospitalised patients with COVID-19
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Press release for new phase III data showing lower hospitalization/mortality, and faster symptom resolution among the subset of patients with at least one risk factor.
Some variants may escape antibodies [1].

Regeneron et al., 3/23/2021, Randomized Controlled Trial, USA, North America, preprint, 1 author.
risk of combined hospitalization/death, 71.3% lower, RR 0.29, p < 0.001, treatment 18 of 1355 (1.3%), control 62 of 1341 (4.6%), 2,400mg IV, >=1 risk factor.
risk of combined hospitalization/death, 70.4% lower, RR 0.30, p = 0.003, treatment 7 of 736 (1.0%), control 24 of 748 (3.2%), 1,200mg IV, >=1 risk factor.
recovery time, 28.6% lower, relative time 0.71, p < 0.001, treatment 1355, control 1341, 2,400mg IV, >=1 risk factor.
recovery time, 28.6% lower, relative time 0.71, p < 0.001, treatment 736, control 748, 1,200mg IV, >=1 risk factor.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
Details of all 4 studies
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