Background: We examined treatment the efficacy and data on long-term outcomes in real-world Japanese patients infected with hepatitis C virus (HCV) genotype 2 treated with 12-week sofosbuvir/ribavirin combination therapy. Patients and Methods: In a total of 86 patients who were treated with sofosbuvir/ribavirin, sustained virological response (SVR) rates and long-term-outcomes were retrospectively analyzed. Results: The adherence to this combination therapy was 98.8%. The rates of SVR at week 24 (SVR24) achieved with this treatment according to the 'intention-to-treat' and 'per-protocol' analyses were 89.5% and 96.2%, respectively. Two patients who experienced relapse did not have any previously reported resistance-associated substitutions in the HCV non-structural protein 5B (NS5B) polymerase region. We did not observe any patients who experienced late relapse but did observe that 50% and 1.3% of patients with and without a previous history of hepatocellular carcinoma (HCC), respectively, developed HCC after achieving SVR24 (with a mean follow-up period of 2.7±0.8 years). Conclusion: Patients with SVR should be carefully followed-up to screen for the occurrence of HCC, although it is infrequent. Chronic hepatitis C virus (HCV) infection is a major cause of hepatocellular carcinoma (HCC) and end-stage liver disease in Japan and Southern Europe (1, 2). Recent interferon-free therapy with direct-acting antivirals (DAAs) against HCV resulted in higher sustained virological response (SVR) rates with shorter treatment durations and few adverse events (3). In Japan, the estimated proportion of the general population with HCV infection is 1.0-2.0%, and HCV genotype 2 (GT2) accounts for 30% of chronic HCV infections (4). The 12-week combination therapy of the HCV non-structural protein 5B (NS5B) inhibitors sofosbuvir and ribavirin was supported by the Japanese health insurance system as the very first DAA therapy for HCV GT2-infected patients (3, 5-7). However, the efficacy and follow-up data of this treatment in a group of real-world Japanese patients infected with HCV GT2 are limited and complex (5-7). Although there are different results between phase III clinical trials and real-world data, the 12-week combination therapy of sofosbuvir/ribavirin led to 90-95% SVR rates in Japanese DAA-naïve patients infected with HCV GT2 (3, 5-7). Recently, pan-genotypic interferon-free therapies became approved in Japan. The 12-week combination of sofosbuvir/HCV NS5A inhibitor ledipasvir without ribavirin has been available for both HCV GT1 and GT2 infection (8, 9). This combination led to 100% and 96% SVR rates in patients infected with HCV GT1 and GT2, respectively (8, 9). The 8-week combination of the HCV NS3 inhibitor glecaprevir/HCV NS5A inhibitor pibrentasvir without ribavirin has also been available for patients without cirrhosis infected with both HCV GT1 and GT2 (10). This combination led to 99.2% and 98.2% SVR rates in patients infected with HCV GT1 and GT2, respectively (10). Thus, 3855 This article is freely accessible o...