A Randomized Clinical Trial of Regdanvimab in High-Risk Patients With Mild-to-Moderate Coronavirus Disease 2019
Jin Yong Kim, Oana Săndulescu, Liliana-Lucia Preotescu, Norma E Rivera-Martínez, Marta Dobryanska, Victoria Birlutiu, Egidia G Miftode, Natalia Gaibu, Olga Caliman-Sturdza, Simin-Aysel Florescu, Hye Jin Shi, Anca Streinu-Cercel, Adrian Streinu-Cercel, Sang Joon Lee, Sung Hyun Kim, Ilsung Chang, Yun Ju Bae, Jee Hye Suh, Da Rae Chung, Sun Jung Kim, Mi Rim Kim, Seul Gi Lee, Gahee Park, MD Joong Sik Eom
Open Forum Infectious Diseases, doi:10.1093/ofid/ofac406
Background. We evaluated clinical effectiveness of regdanvimab (CT-P59), a severe acute respiratory syndrome coronavirus 2 neutralizing monoclonal antibody, in reducing disease progression and clinical recovery time in patients with mild-to-moderate coronavirus disease 2019 (COVID-19), primarily Alpha variant. Methods. This was phase 3 of a phase 2/3 parallel-group, double-blind, randomized clinical trial. Outpatients with mild-tomoderate COVID-19 were randomized to single-dose regdanvimab 40 mg/kg (n = 656) or placebo (n = 659), alongside standard of care. The primary endpoint was COVID-19 disease progression up to day 28 among "high-risk" patients. Key secondary endpoints were disease progression (all randomized patients) and time to recovery (high-risk and all randomized patients). Results. Of 1315 randomized patients, 880 were high risk; the majority were infected with Alpha variant. The proportion with disease progression was lower (14/446, 3.1% [95% confidence interval {CI}, 1.9%-5.2%] vs 48/434, 11.1% [95% CI, 8.4%-14.4%]; P < .001) and time to recovery was shorter (median, 9.27 days [95% CI, 8.27-11.05 days] vs not reached [95% CI, 12.35-not calculable]; P < .001) with regdanvimab than placebo. Consistent improvements were seen in all randomized and non-high-risk patients who received regdanvimab. Viral load reductions were more rapid with regdanvimab. Infusion-related reactions occurred in 11 patients (4/652 [0.6%] regdanvimab, 7/650 [1.1%] placebo). Treatment-emergent serious adverse events were reported in 5 of (4/652 [0.6%] regdanvimab and 1/650 [0.2%] placebo). Conclusions. Regdanvimab was an effective treatment for patients with mild-to-moderate COVID-19, significantly reducing disease progression and clinical recovery time without notable safety concerns prior to the emergence of the Omicron variant. Clinical Trials Registration. NCT04602000; 2020-003369-20 (EudraCT).
Supplementary Data Supplementary materials are available at Open Forum Infectious Diseases online. Consisting of data provided by the authors to benefit the reader, the posted materials are not copyedited and are the sole responsibility of the authors, so questions or comments should be addressed to the corresponding author.
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'abstract': '<jats:title>Abstract</jats:title>\n'
' <jats:sec>\n'
' <jats:title>Background</jats:title>\n'
' <jats:p>We evaluated clinical effectiveness of regdanvimab (CT-P59), a '
'severe acute respiratory syndrome coronavirus 2 neutralizing monoclonal antibody, in reducing '
'disease progression and clinical recovery time in patients with mild-to-moderate coronavirus '
'disease 2019 (COVID-19), primarily Alpha variant.</jats:p>\n'
' </jats:sec>\n'
' <jats:sec>\n'
' <jats:title>Methods</jats:title>\n'
' <jats:p>This was phase 3 of a phase 2/3 parallel-group, double-blind, '
'randomized clinical trial. Outpatients with mild-to-moderate COVID-19 were randomized to '
'single-dose regdanvimab 40\u2005mg/kg (n\u2009=\u2009656) or placebo (n\u2009=\u2009659), '
'alongside standard of care. The primary endpoint was COVID-19 disease progression up to day '
'28 among “high-risk” patients. Key secondary endpoints were disease progression (all '
'randomized patients) and time to recovery (high-risk and all randomized patients).</jats:p>\n'
' </jats:sec>\n'
' <jats:sec>\n'
' <jats:title>Results</jats:title>\n'
' <jats:p>Of 1315 randomized patients, 880 were high risk; the majority were '
'infected with Alpha variant. The proportion with disease progression was lower (14/446, 3.1% '
'[95% confidence interval {CI}, 1.9%–5.2%] vs 48/434, 11.1% [95% CI, 8.4%–14.4%]; P\u2009'
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'[0.6%] regdanvimab and 1/650 [0.2%] placebo).</jats:p>\n'
' </jats:sec>\n'
' <jats:sec>\n'
' <jats:title>Conclusions</jats:title>\n'
' <jats:p>Regdanvimab was an effective treatment for patients with '
'mild-to-moderate COVID-19, significantly reducing disease progression and clinical recovery '
'time without notable safety concerns prior to the emergence of the Omicron variant.</jats:p>\n'
' </jats:sec>\n'
' <jats:sec>\n'
' <jats:title>Clinical Trials Registration</jats:title>\n'
' <jats:p>NCT04602000; 2020-003369-20 (EudraCT).</jats:p>\n'
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