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AIM: To study the role of hybrid bioartificial liver (HBL) in clearing proinflammatory cytokines and endotoxin in patients with acute and sub-acute liver failure and the effects of HBL on systemic inflammatory syndrome (SIRS) and multipl eorgan dysfunction syndrome (MODS).METHODS: Five cases with severe liver failure (3 acute and 2 subacute) were treated with HBL. The clinical signs and symptoms, total bilirubin (TBIL), serum ammonia,endotoxin TNF-α, IL-6 and prothrombin activity (PTA),cholinesterase (CHE) were recorded before, dudng and after treatment. The end-stage liver disease (MELD) was used for the study.RESULTS: Two patients were bridged for spontaneous recovery and 1 patient was bridged for OLT successfully.Another 2 patients died on d 8 and d 21. The spontaneous recovery rate was 30.0%. PTA and CHE in all patients were significantly increased (P＜0.01), while the serum TBIL,endotoxin,TNF-α, IL-6 were decreased. MELD score (mean 43.6) predicted 100% deaths within 3 mo before treatment with HBL. After treatment with HBL, four out of 5 patients had decreased MELD scores (mean 36.6). The MELD score predicted 66% mortalities.CONCLUSION: The proinflammatory cytokines (TNFα, IL6 and endotoxin)can be significantly removed by hybrid bioartificial liver and HBL appears to be effective in blocking SIRS and MODS in patients with acute and sub-acute liver failure. MELD is a reliable measure for predicting short-term mortality risk in patients with end-stage liver disease. The prognostic result also corresponds to clinical outcome.