直接作用型抗ウイルス薬（DAAs）によるC 型慢性肝疾患診療

Hepatitis C virus（HCV）infection is a major worldwide health problem. Chronic infection induces continuous inflammation in the liver, progression of hepatic fibrosis, eventual cirrhosis, and possible hepatocellular carcinoma. Eradication of the virus is one of the most important treatment aims. A number of promising new direct-acting antivirals（DAAs）have been developed over the past １０ years. Due to their increased efficacy, safety, and tolerability, interferon-free oral therapies with DAAs have been approved for patients with HCV, including those with cirrhosis. This review introduces the characteristics and results of recent clinical trials of several DAAs : NS３/４ A protease inhibitors, NS５A inhibitors, and NS５B inhibitors. DAA treatment failure and prognosis after DAA therapy are also discussed.