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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.
Background:
. Coronavirus disease 2019 (Covid-19) has emerged as a pandemic by end-January 2020. Of the infected patients, 10%-15% may develop severe or critical illness. So far, no definite treatment is available for Covid-19. Cytokine release syndrome may underlie the pathogenesis of severe and critical disease. Anti-interleukin (IL)-6 therapies are being tried to improve clinical outcomes.
Methods:
. We did a systematic review to identify the available literature on anti-IL-6 therapies in the treatment of Covid-19 and used the GRADE method to assess the quality of evidence.
Results:
. Four case series and 10 case reports were identified. On critical assessment, we found that these studies reported some beneficial effect of anti-IL-6 therapy, but all the studies had a high risk of bias. The pooled estimate showed that 42% of patients improved but with a very wide confidence interval (CI) (95% CI 1%-91%) and substantial heterogeneity (I2 = 95%). The overall quality of evidence was graded as 'very low'.
Conclusions:
. Although promising, anti-IL-6 therapy for Covid-19 needs to be tested in randomized controlled trials to provide robust evidence.
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