BACKGROUND AND AIMS: Air pollution is associated with advanced liver fibrosis in patients with chronic liver diseases, including chronic hepatitis B (CHB). This study aimed to investigate the association between air pollution and mortality in patients with CHB treated with nucleotide/nucleoside analogues. METHODS: We enrolled 697 patients with CHB treated with nucleotide/nucleoside analogues and analysed the incidence and risk factors for mortality. Daily air pollutant concentrations were estimated from the year before enrolment. RESULTS: All-cause mortality showed an annual incidence of 1.1/100 person-years after a follow-up period of 3798.1 person-years. Factors with the strongest association with all-cause mortality were liver cirrhosis (hazard ratio [HR]/95% confidence interval [CI]: 3.95/1.69-9.23
p = 0.02), age ([HR]/CI: 1.07/1.03-1.17, p <
0.001) and pre-treatment gamma-glutamyl transferase (GGT) levels (HR/CI: 1.004/1.001-1.006, p = 0.004). Among patients with cirrhosis, the factors associated with all-cause mortality were age (HR/CI: 1.08/1.04-1.12, p <
0.001), pre-treatment GGT levels (HR/CI: 1.004/1.001-1.008, p = 0.01), platelet count (HR/CI: 0.988/0.977-0.998, p = 0.02) and NO CONCLUSIONS: Air pollution influences all-cause mortality in patients with CHB receiving nucleotide/nucleoside analogue therapy. Long-term NO