Clinical trials have been testing whether drugs that inhibit the effects of interleukin-6, such as tocilizumab and sarilumab, benefit hospitalized patients with COVID-19. These trials have variously reported benefit, no effect and harm.

So, researchers from WHO’s Rapid Evidence Appraisal for COVID-19 Therapies [REACT] Working Group, to examine the benefit of treating hospitalized COVID-19 patients with interleukin-6 antagonists, compared with either a placebo or usual care. They combined data from 27 randomized trials that were conducted in 28 countries.

Analysis was done on 10,930 patients, of whom 6,449 were randomly assigned to receive interleukin-6 antagonists and 4,481 to receive usual care or placebo.

Results proved that the risk of dying within 28 days is lower in patients receiving interleukin-6 antagonists. In this group, the risk of death is 22% compared with an assumed risk of 25% in those receiving only usual care.

The risk of dying within 28 days is 21% in patients receiving interleukin-6 antagonists compared with an assumed 25% in patients receiving usual care. This means that for every 100 such patients, four more will survive.

The risk was found to be 26% for those receiving interleukin-6 antagonists compared with an assumed 33% in those receiving usual care. This means that for every 100 such patients, 7 more will survive and avoid mechanical ventilation.

Commenting on the results of the analysis Dr Janet Diaz, Lead for Clinical management, WHO Health Emergencies, said: “Bringing together the results of trials conducted around the world is one of the best ways to find treatments that will help more people survive COVID-19. We have updated our clinical care treatment guidance to reflect this latest development.

While science has delivered, we must now turn our attention to access. Given the extent of global vaccine inequity, people in the lowest income countries will be the ones most at risk of severe and critical COVID-19. Those are the people these drugs need to reach.”

Prof Manu Shankar-Hari, Critical Care Consultant at Guy’s and St Thomas’ Hospital NHS Foundation Trust, Professor of Critical Care Medicine at King’s College London and a NIHR Clinician Scientist, said: “COVID-19 is a serious illness. Our research shows that interleukin-6 antagonists reduce deaths from COVID-19, i.e. save lives, and prevent progression to severe illness necessitating breathing support with a ventilator.

Further, interleukin-6 antagonists appear even more effective when used alongside corticosteroids. Our research findings reflect the incredible research effort from scientists worldwide since the start of the pandemic. On a personal note, I am grateful to the patients and their families for their willingness to participate in research during these challenging times.”

Jonathan Sterne, Professor of Medical Statistics and Epidemiology, University of Bristol, Deputy Director of the National Institute for Health Research Bristol Biomedical Research Centre and Director of Health Data Research UK South West, said: “Clinical trials assessing the efficacy of monoclonal antibodies that block interleukin-6 in hospitalized patients with COVID-19 have variously reported benefit, no effect and harm.

By rapidly combining 95 per cent of the worldwide data from these trials, we have shown that these drugs work consistently in reducing death and severe COVID-19 disease across countries and health care settings, and that they work better among patients who are also receiving corticosteroids.”

Claire Vale, Principal Research Fellow at the MRC Clinical Trials Unit at UCL , said: “These results, which will lead to better outcomes for patients hospitalized with COVID-19, reflect a huge global effort.

Bringing together this information in such a short space of time has only been possible thanks to the overwhelming commitment of all the doctors and teams who ran the trials, and of course, the patients who took part in them.”

Source: Medindia