In addition, viral factors such as HCV core amino acid variations have been associated with IFNL3 genotype and hepatic steatosis. In our study, although the association was not significant, mutations at HCV core amino acid at position 70 tended to be lower in IFNL3 major genotype than in minor genotype, and lower in patients without steatosis than in patients with steatosis (data not shown). On the other hand, amino acid mutations at core position 91 was significantly lower in major genotype, and lower in patients without hepatic steatosis .