Abstract
Monoclonal antibodies, as tixagevimab/cilgavimab, have been introduced as prophylaxis against COVID-19 infections in high-risk populations. However, data on efficacy are limited. This study investigates efficacy and tolerability of tixagevimab/cilgavimab in hematological patients under real-life conditions. Tixagevimab/cilgavimab was administered to 155 hematological patients (March-August 2022) at two Austrian centres. S/RBD-antibody assessments were performed before (T0), four weeks (T1), and six months (T2) after application. Side effects, the occurrence of COVID-19 infections, and the course of S/RBD-antibody titres were analysed retrospectively in relation to clinical variables. 155 hematological patients, who refused tixagevimab/cilgavimab, were included as a control group to compare the frequency of COVID-19 infections. Of all immunised patients (52.3% males; 91% triple vaccinated), 25.8% had a COVID-19 breakthrough infection (76% mild) compared to 43.9% in the control group. Patients with chronic lymphocytic leukaemia (CLL)/lymphoma were at highest risk of a COVID-19 infection (OR = 2.21; 95% CI 1.05–4.65; p = 0.037). After immunisation, a steep increase in median antibody levels (1193.4BAU/ml, IQR 0–2318.94) was observed in 67.8%, followed by a rapid decrease between T1 and T2 (465.95BAU/ml, IQR 0–1900.65.3) with the greatest declines in CLL/lymphoma (848.7BAU/ml, IQR 0–1949.6, p = 0.026). Side-effects occurred in 21.2% (CTCAE I/II). These real-world data indicate that S/RBD antibodies respond rapidly after passive immunisation in all hematological patients without safety concerns. Given the rapid decline in S/RBD antibodies, early booster immunisations should be considered for future scenarios in this vulnerable group.
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All authors of this research paper have directly participated in the planning, execution, or analysis of the study.
MB, PR, BH and TW contributed to the study conception and design. MB, PR, VP, AM, BH, LS, AW, TL, MH, KG, JR, MA, SM, PF, SS, NS, AG, EG, DN, WW, DW and TW performed data collection and analysis. MB and PR wrote the first draft of the manuscript, and all authors commented on previous versions. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of the Medical University of Innsbruck (EC No: 1088/2021 and 1355/2022).
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Patrick Reimann and Verena Petzer contributed equally to this work as co-first authors.
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Reimann, P., Petzer, V., Mündlein, A. et al. Efficacy and safety of tixagevimab/cilgavimab as passive immunisation against COVID-19 infections in patients with hematological malignancies. Ann Hematol (2024). https://doi.org/10.1007/s00277-024-05671-6
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DOI: https://doi.org/10.1007/s00277-024-05671-6