Evaluating plasma ferritin and suPAR as treatable traits for critically ill patients with COVID-19 treated with anakinra: an exploratory analysis of the immune modulation domain of the REMAP-CAP randomised clinical trial

Identifying treatable traits in critically ill patients offers potential to enable a precision medicine approach to treatment. The aim of this exploratory analysis of the REMAP-CAP immune modulation domain was to evaluate whether plasma ferritin or soluble urokinase plasminogen activator receptor (suPAR) represent treatable traits for anakinra in critically ill patients with coronavirus disease (COVID-19).

An exploratory analysis of patients randomised within the COVID-19 immune modulation domain of the REMAP-CAP trial was conducted. Adults within 24 h of receiving respiratory or cardiovascular organ support in an ICU with suspected or microbiologically confirmed COVID-19 were included. Plasma ferritin was measured at study sites, and plasma suPAR measured in stored plasma samples. The primary outcome was organ support-free days (OSFD) until day 21. Analyses were performed using a Bayesian cumulative logistic regression model, and results are presented as the posterior median odds ratio (OR), along with 95% credible intervals (CrI), for anakinra being superior to control.