Findings show bamlanivimab’s limits
“Based on the findings of the current study, no clear subgroup of patients could be identified who would benefit from bamlanivimab when hospitalized with COVID-19,” said Suman Pal, MD, of the University of New Mexico, Albuquerque, in an interview.
“The study findings also show possible harm of using bamlanivimab in hospitalized COVID-19 patients who were seropositive for neutralizing antibodies prior to receiving therapy,” Dr. Pal emphasized. “Moreover, the study did not include participants with COVID-19 from variant strains, such as delta and omicron, which currently account for a large number of cases.” “Therefore, the results of this study do not support the use of bamlanivimab in the clinical setting until further evidence is available to guide the selection of patients who may benefit from therapy,” he explained.
“The possible benefit of bamlanivimab does not outweigh the risks in patients hospitalized with COVID-19,” he concluded.
Dr. Pal emphasized the need for larger prospective studies to establish whether bamlanivimab may have benefits in a subgroup of patients, but “well-validated point-of-care tests to identify such patients need to be readily available before this therapy can be considered by clinicians at the bedside,” he concluded.
Diligent screening required before use
Monoclonal antibody treatment has been administered to individuals with diagnosis of COVID-19 infection as outpatients as well as for hospitalized inpatients, said Noel Deep, MD, an internist in Antigo, Wisc., in an interview. “This study is important because it helps physicians and health care institutions to evaluate whether continued use of the monoclonal antibodies would be beneficial and, if so, in what patient populations,” he said.
The findings present interesting implications for the care of COVID-19 patients, said Dr. Deep. “This study indicates that bamlanivimab does not provide the benefit that was initially envisioned when the monoclonal antibody infusions were initially initiated in the treatment of COVID-19 infections. “Serological screening of the patients would help to identify that subgroup of individuals who could benefit from this monoclonal antibody rather than administering it to every COVID-19–positive individual,” he explained.
However, “it is important to note that the emergency use authorization (EUA) for single-agent bamlanivimab has been revoked,” Dr. Deep said.
“The potential benefits of bamlanivimab can be realized only if adequate attention is paid to identifying the appropriate candidates based on serological screening, and administering bamlanivimab to those who are already producing endogenous antibodies could lead to increased risk to those individuals,” he said. Dr. Deep added that he would favor administration of bamlanivimab “in those appropriately screened and eligible candidates, and it is my opinion that the benefits outweigh the risks in those individuals.”
Although the EUA for single-agent bamlanivimab has been revoked, “alternative monoclonal antibody therapies remain available under EUA, including REGEN-COV (casirivimab and imdevimab, administered together), and bamlanivimab and etesevimab administered together, for the same uses as previously authorized for bamlanivimab alone,” Dr. Deep said. “The FDA believes that these alternative monoclonal antibody therapies remain appropriate to treat patients with COVID-19, and I would like to see some data about the benefits and risks of these agents,” he noted.