Polymyxin B haemoadsorption in endotoxic septic shock (TIGRIS): a multicentre, open-label, Bayesian, randomised, controlled, phase 3 trial
The Lancet Respiratory Medicine · 2026 · 19 US hospitals · n = 287
A phase 3 Bayesian RCT enrolling adults with septic shock, multiorgan dysfunction, and endotoxin activity (EAA) between 0.60 and 0.89 units — the "high but not maximal" endotoxin phenotype identified in the EUPHRATES trial. Patients were randomized 2:1 to two sessions of polymyxin B haemoadsorption plus standard care versus standard care alone.
The study used a prespecified Bayesian analysis that formally pooled evidence from both EUPHRATES and TIGRIS, making this the first prospective validation of the enriched endotoxin endotype in septic shock research.