AIM To assess the effect of long-term oral nucleos(t)ide analogues(NUCs) therapy on liver volume change in patients with suppress hepatitis B virus(HBV)-related liver cirrhosis.METHODS We reviewed the data of na?ve patients with HBVrelated liver cirrhosis, who had taken oral NUCs therapy, between 2003 and 2007 at Chonbuk University Hospital. We analyzed two consecutive sets of abdominal computerized tomography scans-one at the time oftreatment initiation and another at the second-year follow-up. Liver volume was calculated by 3-dimensional liver extraction volumetry program.RESULTS A total of 55 patients(34 males) were included. There was 114.3 m L ± 167.8 m L(12.9% ± 17.9%) of increase in liver volume during the two years of NUCs therapy(993.8 m L ± 242.8 m L at baseline vs 1108.1 m L ± 263.3 m L at two-year follow-up, P < 0.001). The ratio of the measured baseline liver volume to the estimated standard liver volume was improved from 70.8% to 78.0%. An increase in liver volume was shown not only in patients with compensated cirrhosis(P = 0.046) but also in those with decompensated cirrhosis(P < 0.001). Significant factors for volume increases were Child-Turcotte-Pugh grade and model for end-stage liver disease score improvement without virological breakthrough. In multiple linear regression analysis, delta albumin and delta alanine aminotransferase levels showed a significant association with the increase in liver volume(P = 0.002 and 0.005, respectively).CONCLUSION Long-term oral NUCs therapy in patients with HBVrelated liver cirrhosis lead to significant increase in liver volume assessed with 3-dimensional liver extraction volumetry program. AIM To assess the effect of long-term oral nucleos (t) ide analogues (NUCs) therapy on liver volume change in patients with suppress hepatitis B virus (HBV) -lated liver cirrhosis. METHODS We reviewed the data of na? Ve patients with HBVrelated liver cirrhosis, who had taken oral NUCs therapy, between 2003 and 2007 at Chonbuk University Hospital. We analyzed two consecutive sets of abdominal computerized tomography scans-one at the time of treatment initiation and another at the second-year follow-up. Liver volume was was calculated by 3-dimensional liver extraction volumetry program. RESULTS A total of 55 patients (34 males) were included. There was 114.3 m L ± 167.8 m L (12.9% ± 17.9%) of increase in liver volume during the two years of NUCs therapy (993.8 m L ± 242.8 m L at baseline vs 1108.1 m L ± 263.3 m L at two-year follow-up, P <0.001). The ratio of the measured baseline liver volume to the estimated standard liver volume was improved from 70.8% to 78.0%. An increase in liver volume was shown not only in patients with compensated cirrhosis (P = 0.046) but also in those with decompensated cirrhosis (P <0.001). Significant factors for volume increased were Child-Turcotte-Pugh grade and model for end-stage liver disease score improvement without virological breakthrough. In multiple linear regression analysis, delta albumin and delta alanine aminotransferase levels showed a significant association with the increase in liver volume (P = 0.002 and 0.005, respectively) .CONCLUSION Long-term oral NUCs therapy in patients with HBVrelated liver cirrhosis lead to significant increase in liver volume assessed with 3-dimensional liver extraction volumetry program.