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Background & Aims Liver steatosis may occur concomitantly in patients with chronic hepatitis B infection (CHB) and is implicated in increased morbidity and mortality. Hepatitis B virus (HBV) viral load is a marker for disease progression and long-term outcomes in CHB. We investigated the association between liver steatosis and HBV viral load and their individual effects on all-cause mortality and the development of cancer in patients with CHB and liver steatosis. Methods This retrospective study included 524 treatment-naïve patients with CHB, with a mean follow-up of 6 years. Liver biopsy was available for 170 patients and liver steatosis was validated by at least 3 ultrasonographic examinations. Results A total of 241/524 (46%) patients with CHB had liver steatosis, with a strong correlation between the degree of liver steatosis as assessed by ultrasonography or by liver biopsy (r = 0.9, p, Graphical abstract Unlabelled Image, Highlights • HBV viral load is an important predictor of adverse outcomes in patients with chronic HBV (CHB). • Liver steatosis may co-occur with CHB but its effect on all-cause mortality and cancer has not been determined. • Liver steatosis is significantly associated with all-cause mortality and cancer in patients with CHB. • The effect of liver steatosis on mortality and cancer is stronger than the effect of HBV viral load. • Patients with CHB and liver steatosis should be closely monitored, irrespective of their viral load.

Background: The advent of direct-acting antivirals (DAAs) has transformed the landscape of hepatitis C virus (HCV) management. However, the high cost of DAAs therapy has become a major barrier to HCV elimination. We aimed to prospectively evaluate the efficacy and safety of reducing the duration of DAAs therapy using response-guided therapy approach based on mathematical modeling of viral kinetics. Methods: Patients were treated with DAAs according to the physicians’ preference. HCV was measured at baseline and at day 2 and weeks 1, 2 and 4 after treatment initiation. The primary endpoint was the proportion of patients with sustained-virological response (SVR) at 12 and/or 24 weeks post-treatment. Findings: Twenty-nine patients (mean age 54±16, 44% females, 73% with HCV genotype 1), were enrolled and all completed therapy. Sofosbuvir/velpatasvir, elbasvir/grazoprevir, sofosbuvir/ledipasvir and glecaprevir/pibrentasvir, were administered in 38%, 27%, 21% and 14% of patients, respectively. Treatment duration was shortened in 11 of the 29 patients (38%). SVR was achieved in 28 of the 29 patients (97%). Relapse occurred post treatment in a single case of a non-cirrhotic male with genotype 3, who was treated with sofosbuvir/velpatasvir for 6 weeks. Virus sequencing did not identify baseline or treatment emergent resistance associated substitutions. Interpretation: Real-time modeling can be utilized for shortening DAAs duration in approximately 40% of patients without compromising treatment efficacy. Implementation of this model on a wider scale may lead to significant cost-saving and to improved access to anti-HCV care. Trial Registration: ClinicalTrials.gov Identifier: NCT03603327. Funding Statement: This research was supported in part by Clalit Health Services and the National Institutes of Health (NIH) and extramural NIH grants R01-AI078881 and R01GM121600. Declaration of Interests: OE has consulted for Gilead and Abbvie and received lecture fees from Gilead, Abbvie and MSD. HD has consulted for CoCrystal Inc. None of the other authors has any financial interest or conflict of interest related to this research. Ethics Approval Statement: The study was approved by the institutional review boards of Soroka and Rabin Medical Centers and was conducted in compliance with the Declaration of Helsinki, Good Clinical Practice guidelines, and local regulatory requirements. All patients provided written informed consent.