Anti-interleukin-6 therapies for Covid-19: A systematic review, critical appraisal and meta-analysis

Arunmozhimaran Elavarasi1, Ranjit Kumar Sahoo2, Tulika Seth3

  • 1Department of Neurology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.

Insights

Anti-interleukin-6 (IL-6) therapies show potential for treating severe COVID-19 by reducing cytokine release syndrome. However, current evidence is of very low quality, necessitating further research through randomized controlled trials.

Area of Science:

  • Infectious Diseases
  • Immunology
  • Critical Care Medicine

Background:

  • Coronavirus disease 2019 (COVID-19) is a global pandemic with a significant proportion of patients developing severe or critical illness.
  • Cytokine release syndrome is implicated in the severe pathogenesis of COVID-19.
  • Anti-interleukin-6 (IL-6) therapies are being investigated as a potential treatment to mitigate severe COVID-19 outcomes.

Purpose of the Study:

  • To systematically review the existing literature on the efficacy of anti-IL-6 therapies in treating COVID-19 patients.
  • To assess the quality of evidence for anti-IL-6 therapies using the GRADE method.

Main Methods:

  • A systematic review was conducted to identify relevant studies.
  • Case series and case reports were analyzed.
  • The GRADE methodology was employed to evaluate the quality of the evidence.

Main Results:

  • The review identified 4 case series and 10 case reports on anti-IL-6 therapy for COVID-19.
  • Studies reported a potential beneficial effect of anti-IL-6 therapy, but all had a high risk of bias.
  • Pooled analysis indicated a 42% improvement rate (95% CI 1%-91%) with substantial heterogeneity (I² = 95%).
  • The overall quality of evidence was graded as 'very low'.

Conclusions:

  • Anti-IL-6 therapy shows promise for managing severe COVID-19.
  • The current evidence base is limited by high risk of bias and substantial heterogeneity.
  • Randomized controlled trials are essential to establish robust evidence for the efficacy of anti-IL-6 therapies in COVID-19 treatment.
Abstract

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