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Antibody-based Therapies Show Benefit in COVID Patients

by Angela Mohan on Dec 23 2020 11:37 AM

Treatment with the monoclonal antibodies Casirivimab and Imdevimab seems most effective in COVID-19 patients who haven't yet elicited an immune response to the disease.

Antibody-based Therapies Show Benefit in COVID Patients
Casirivimab and Imdevimab, which act as monoclonal antibodies found to be effective in treating COVID-19 patients who haven't yet elicited an immune response and in those with a high viral load, according to a Regeneron-supported study in the New England Journal of Medicine.
The study was done on 275 outpatients who were randomized to receive either low- or high-dose antibodies or placebo.

Results show that 3% of patients in the antibody group and 6% in the placebo group required at least one medical visit through day 29. Among those who were negative for SARS-CoV-2 antibodies at baseline, the proportions were 6% vs. 15%. In addition, patients who had the highest viral load at baseline saw the greatest reductions in viral load by day 7.

Tocilizumab, the anti–interleukin-6 receptor monoclonal antibody could improve outcomes in hospitalized adults with COVID-19 pneumonia who are not on mechanical ventilation. In an industry-supported, international trial in the New England Journal of Medicine, around 400 patients were randomized to standard care either alone or with one or two doses of tocilizumab.

Results show that primary efficacy outcome significantly favored the tocilizumab group (12% vs. 19% with standard care alone).

Mortality alone did not differ significantly between the groups. The trial emphasized enrollment of racial/ethnic minority groups, and the results were consistent among Blacks, Latinx patients, and American Indian/Alaska Natives.



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