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FOLLOW-UP OF OFF-LABEL TOCILIZUMAB PRESCRIPTIONS IN COVID-19 IN A FRENCH UNIVERSITY HOSPITAL

European Statement

Education and Research

Author(s)

Caroline TRAN VAN HO, Marie-Anne ESTEVE, Pierre BERTAULT-PERES, Marjorie ROUDOT

Why was it done?

SARS-CoV-2 infection leads to pro-inflammatory molecules production (in particular IL-6). If the immune system is overwhelmed and cytokine production spikes, a hyper-inflammatory phenomenon occurs: the cytokinic storm, which can bring lead to the admission in an intensive care unit. Due to the absence of authorized treatment, several clinical trials (CTs) and off-label use of drugs have been set up.

What was done?

The aim of this study is to analyse the off-label use of tocilizumab in a French university hospital in comparison with different CTs.

How was it done?

A retrospective study of tocilizumab prescriptions in Covid-19 was conducted between 01/03/2020 and 30/04/2021 by extracting data from Computerised Physician Order Entry and Pharmacy Management software (Pharma®). History of patients was recovered by electronic medical records (Axigate®).
Results were compared to (1) RECOVERY Collaborative Group. Lancet. 2021, (2) Hermine O. JAMA. 2021, (3) Rosas IO. N Engl J Med. 2021, (4) Salama C. N Engl J Med. 2021.

What has been achieved?

Between 01/03/2020 and 30/04/2021, 68 patients received tocilizumab.
Seventy-seven percent of patients were in the intensive care unit and 42.6% died, whereas 31.0%, 19.7%, 11.1% and 10.4% died according to (1), (3), (2) and (4), respectively. Mechanical or invasive ventilation at the time of tocilizumab prescription was widely used (84%) compared to CTs (54.0%, 27.9%, 24.0%, 12.2% for (1), (3), (2), (4)). According to (1), there is a synergistic action between tocilizumab and dexamethasone. Eighty-four percent of patients received at least one dose of corticosteroids in agreement with (1) and (4).

What next?

The increase in off-label use of tocilizumab is related to the results of CTs. Because of the low number of patients, the differences in COVID-19 stages at tocilizumab initiation, and the absence of a control group, it is difficult to explain our data. Given the weak iatrogenic effects revealed in CTs and in-label use, the benefit/risk seems in favor of tocilizumab use against COVID-19. Further studies are needed to confirm the first hopes. Since Casirivimab / imdevimab, and amlanivimab / etesevimab have been granted early access in France, the therapeutic strategy will be updated.

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