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  • Brensocatib Did Not...

Brensocatib Did Not Improve Condition of Patients with Severe COVID-19: STOP-COVID19 Trial

Written By : Dr. Kamal Kant Kohli Published On 2022-05-20T08:45:26+05:30  |  Updated On 20 May 2022 12:15 PM IST
Brensocatib Did Not Improve Condition of Patients with Severe COVID-19: STOP-COVID19 Trial
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San Francisco, CA: Brensocatib did not improve the clinical status of patients hospitalized with severe SARS-CoV-2 infection in the double-blind randomized, placebo-controlled STOP-COVID19 multicenter clinical trial, according to research published at the ATS 2022 international conference.

The study, which began in June of 2020, took place at 14 UK hospitals, where participants were randomized to receive 25 mg daily of brensocatib or placebo for 28 days. One-hundred ninety patients received brensocatib, while 214 received placebo.

All patients in the study had confirmed SARS-CoV-2 infection and at least one risk factor for severe COVID-19, such as requiring supplemental oxygen, Individuals on mechanical ventilation were excluded from the study. All participants received standard of care treatment.

"Treatments currently available to treat COVID-19, such as dexamethasone and anti-IL-6 antibodies, reduce inflammation, but their effect is not primarily on neutrophils or neutrophilic inflammation," said presenting author Holly Keir, PhD, postdoctoral researcher, University of Dundee School of Medicine, Dundee, United Kingdom. "We performed the STOP-COVID trial to test the hypothesis that directly targeting neutrophilic inflammation by inhibiting dipeptidyl peptidase-1 (DPP1) would provide additional benefits to patients with severe COVID-19 on top of standard of care."

Severe COVID-19 infection is primarily caused by an excessive and damaging immune response to the virus. A number of different immune cells are involved in this response, including neutrophils. Neutrophils release enzymes and other substances that cause severe lung damage. Studies have consistently shown that high levels of neutrophilic inflammation are associated with worse outcomes in COVID-19.

Brensocatib is an investigational oral inhibitor of DPP1, an enzyme responsible for the activation of neutrophil serine proteases.

In STOP-COVID19, time to clinical improvement and time to discharge were not different between groups. Mortality was 10.7 percent and 15.3 percent in the placebo and brensocatib treated groups, respectively. Oxygen and new ventilation use were also numerically greater in the brensocatib treated patients.

Prespecified subgroup analyses based on age, sex, baseline severity, co-medications and duration of symptoms supported the primary results. Adverse events were reported in 46.3 percent of placebo treated patients and 44.8 percent of brensocatib treated patients.

The researchers also conducted a sub-study at two study sites to directly measure inflammation in patients receiving DPP1 inhibition or placebo. They observed a strong anti-inflammatory effect of DPP1 inhibition on neutrophil protease enzymes. Active blood neutrophil elastase levels were reduced by day eight in the treatment group and remained significantly lower up to day 29.

"Although we did not find a beneficial effect of treatment in this population, these results are important for future efforts to target neutrophilic inflammation in the lungs. STOP-COVID19 is the largest completed trial of DPP1 inhibition in humans and we have performed extensive characterization of how DPP1 inhibition affects the immune system's response," noted Dr. Keir.

"Using state-of-the-art proteomics (the study of the structures, functions, and interactions of proteins) we have already seen important changes in neutrophils with DPP1 inhibition that will help us to better understand the potential role of this treatment in other diseases."

One of these diseases is bronchiectasis, where a phase 2 trial published in 2020 showed that brensocatib reduced the risk of exacerbations.

The STOP-COVID19 study was an investigator-initiated study sponsored by the University of Dundee and funded by Insmed Incorporated.

American Thoracic SocietyATSBrensocatibCOVIDCOVID 19COVID patientshospitalizationSARS-CoV-2SARS-CoV-2 infectionventilationCOVID treatmentneutrophils
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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