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[Host factors and viral factors in hepatitis C treatment].

In the interferon-based therapy for hepatitis C, host factors such as age, gender, liver fibrosis and steatosis are important as a therapeutic effect predictor, and viral factors such as HCV genotype, HCV viral load, HCV gene (IL28B, ITPA) are also important. In addition in genotype 1b, ISDR/IRRDR and core amino acid substitution are important. Also in the DAA treatment, viral factors are also important at the view of therapeutic effect and difficulty of acquisition of drug resistance mutation. In addition, the goal of treatment of hepatitis C are suppression of liver fibrosis progression and liver cancer and improvement of quality of life due to this (quality of life: QOL) and life prognosis, it is important to understand the host factors and HCV viral factors.