F. Hoffmann-La Roche Ltd: Phase III prevention trial showed subcutaneous administration of investigational antibody cocktail casirivimab and imdevimab reduced risk of symptomatic COVID-19 infections by 81%
Placebo
Risk reduction
13
1.2
4 copies/mL)
14
0.4
*
Individuals without any COVID-19 symptoms who lived in the same household as an individual who tested positive to SARS-CoV-2 within the prior four days
. Based on the seronegative modified Full Analysis Set population, which includes all randomized subjects without evidence of current or prior SARS-CoV-2 infection (i.e., a negative RT-qPCR test and a negative antibody test) at randomization.
Adverse events (AEs) occurred in 20% (n=265 out of 1,311) of REGEN-COV participants and 29% (n=379 out of 1,306) of placebo participants, and serious AEs occurred in 1% (n=10) of REGEN-COV participants and 1% (n=15) of placebo participants. There were 0 REGEN-COV participants and 4 placebo participants who were either hospitalized or visited the emergency room because of COVID-19 during the 29-day efficacy assessment period. Injection site reactions, all of which were grades 1-2, occurred in 4% (n=55) of REGEN-COV participants and 2% (n=19) of placebo participants. No individuals from either group withdrew from the trial due to AEs, and none of the deaths in the trial (2 REGEN-COV, 2 placebo) were attributed to COVID-19 or study drug.